GB2534676A

GB2534676A - Electrical power control device and system

Info

Publication number: GB2534676A
Application number: GB1521773.0A
Authority: GB
Inventors: Hickson Ian
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-12-12
Filing date: 2015-12-10
Publication date: 2016-08-03
Also published as: GB201515732D0; GB201521773D0

Abstract

An electrical power control device 101 adapted to receive electrical power from a first source 102 (which may be a renewable energy source), and a second source 115 said electrical power control device arranged to output electrical power from a first output and a second output. The first output is arranged to provide electrical power to a first load 106 from the first source, the second source or a combination of the first source and second source. The electrical power control device further comprises a controller 112 arranged to control the electrical power control device, wherein if the controller determines that the first source is providing at least a threshold level of power and that the first load requires power, the controller is arranged to control the electrical power control device to isolate using a switch 104 the second output therefore isolating the first source 102 from the second source 115 and isolate the first load 106 from the second source 115 and prioritising providing electrical power to the first load 106 exclusively from the first source 106.

Description

ELECTRICAL POWER CONTROL DEVICE AND SYSTEM

Technical Field

This invention relates to programmable electrical control devices. More specifically, but not exclusively, embodiments of the invention relate to programmable electrical control devices which can be integrated into an electrical installation to allow loads to be fed from the conventional electrical mains supply, an electrical supply from a renewable energy source or a combination of both.

Background

Not all energy produced by a renewable energy source is fully utilised within an electrical system. An example of this would be that a system may produce 4 kW of electrical energy through the day when the inhabitants of domestic premises are not at home. The premises may only need 0.5 kWs to run the property at that time meaning that 3.5 kWs are unused.

Currently available systems, including control devices which can be used to control 20 unused electrical energy generated from a renewable/carbon free source as part of any electrical installation, are typically arranged to direct the unused electrical energy to a specific load which is connected directly to those control devices.

This means that with the current systems available there is a need to add additional loads/equipment such as extra immersion heaters, conventional heaters such as convector/oil filled radiators and night storage heaters into the electrical installation which are connected directly to a control device.

Any energy (or surplus energy) produced by the renewable energy source is directed to these specific loads via a control device. When there is no surplus renewable electrical energy being produced then these items connected to the control device are not utilised.

The below examples highlight two issues with these systems.

In a typical domestic electrical installation which already incorporates an immersion heater, then there is a need to install an additional immersion heater which would be connected to the controller to allow the surplus renewable electrical energy to be used.

In a typical domestic electrical installation which already incorporates a night storage heater, then there is a need to install an additional night storage heater to heat this lo area which would be connected to the controller to allow the surplus renewable electrical energy to be stored /used.

The current systems available are designed is such a way that they are not compatible with any loads which have electronic controls. Given that most equipment in the present day has electronic controls as part of their design this reduces the use of these products. Electronic controls in this context refers to but is not restricted to electronic printed circuit boards, electronic printed circuit boards with the capacity for LAN connection(s), electronic printed circuit boards with a communication system which communicates via air, Bluetooth communication systems, wireless systems, radio systems, mobile network systems or carrier signals transmitted over the mains cabling and mobile network signals.

An aim of the present invention is to at least partly mitigate some of these problems.

Summary of the Invention

In accordance with a first aspect of the invention, there is provided an electrical power control device adapted to receive electrical power from a first source, and a second source said electrical power control device arranged to output electrical power from a first output and a second output, wherein the first output is arranged to provide electrical power to a first load from the first source, the second source and a combination of the first source and second source, and the second output provides power from the first source to combine with the second source, wherein the electrical power control device further comprises a controller arranged to control the electrical power control device, wherein if the controller determines that the first source is providing at least a threshold level of power and that the first load requires power, the controller is arranged to control the electrical power control device to isolate the second output therefore isolating the first source from the second source and isolate the first load from the second source and provide electrical power to the first load exclusively from the first source.

Optionally, the second power source is provided via a distribution board.

Optionally, the controller is arranged to control the electrical power control device to output electrical power to further loads, wherein the controller is arranged to isolate the further loads from the second source and to provide electrical power to one of the further loads exclusively from the first source if the first source provides at least a threshold level of power and if the controller determines that one of the further loads requires power.

Optionally, if the controller determines that more than one of the first load and further loads requires power, the controller is arranged to prioritise to which of the further loads electrical power is provided in accordance with a predetermined priority.

Optionally, the electrical power control device includes a power detector coupled to the controller, said power detector arranged to measure the level of power from the first source.

Optionally, the first source is a renewable energy source.

Optionally, the first load comprises an energy storage load.

Optionally, the at least one of the one or more further loads is an energy storage load.

In accordance with a second aspect of the invention there is provided an electrical distribution system comprising an electrical power control device according to the first aspect of the invention.

In accordance with a third aspect of the invention, there is provided an electrical power control device adapted to receive electrical power from a first source, said electrical power control device arranged to output electrical power from a first output and a second output, wherein the first output is arranged to provide electrical power to a first load and the second output provides power from the first source to combine with a second power source, wherein the electrical power control device further comprises a controller arranged to control the electrical power control device, wherein if the controller determines that the first source is providing at least a threshold level of power and that the first load requires power, the controller is arranged to control the electrical power control device to isolate the second output therefore isolating the first source from the second source and to provide electrical power to the first load exclusively from the first source.

The electrical power control device can be installed between the renewable energy source (typically after the inverter unit, generation meter) and the distribution board which forms the primary connection with the device. In some embodiments, auxiliary wiring is installed to the final circuits from the distribution board by breaking into the wiring between the main or off peak electrical distribution board and the specified loads to be fed by the renewable energy source. This arrangement forms the auxiliary connections with the electrical power control device. The integration of the electrical power control device in this way allows loads that would normally be fed from the main or off peak electrical distribution board via the national grid and the renewable energy source (if it was producing any energy) to have the option to be fed solely from the renewable energy source when the renewable energy source of supply is generating energy above a threshold value.

This gives the benefit for example, of only needing one immersion heater within the electrical system. Most standard cylinders have the facility to install one immersion heater and most premises with a cylinder will already have an immersion heater installed. This system can utilise this immersion heater reducing the need for replacing cylinders/installing additional immersion heaters as other systems would so require, having a load to use the renewable energy not utilised by the system.

The energy generated from the renewable energy source which is stored in loads such as night storage units and water tanks heated by an immersion heater can be recovered by the consumer when required such as heating the premises when occupied or providing hot water to the premise when required therefore reducing the need for the use of energy such as gas, oil or electricity at these times.

A further advantage of certain embodiments of the present invention is that a renewable power source can be used to power one or more loads irrespective of the type of control system that controls the loads, and without any requirement to modify the control systems of the loads.

Various further aspects and features of the invention are defined in the claims.

Brief Description of Figures

Certain embodiments of the present invention will now be described hereinafter, by way of example only, with reference to the accompanying drawings in which: Figure 1 provides a schematic diagram of an electrical distribution system arranged in accordance with an example of the invention, Figure 2 provides a schematic diagram of an electrical distribution system arranged in accordance with an example of the invention, Figure 3 provides a schematic diagram of an electrical power control device arranged in accordance with an example of the invention, Figure 4 provides a schematic diagram of a zone with an electrical power control 15 device arranged in accordance with an example of the invention; and Figure 5 provides a schematic diagram of an electrical distribution system arranged in accordance with an example of the invention.

zo In the drawings like reference numerals refer to like parts.

Detailed Description

Figure 1 provides a schematic diagram of a system arranged in accordance with an example of the invention.

An electrical power control device 101 is coupled to a renewable power source 102 via a first electrical connection 103. The electrical power control device 101 includes a switch unit including a number of terminals, each terminable being connectable to an electrical connection. The switch unit includes switching componentry which allows the terminals to be electrically connected to each other and electrically isolated from each other under the control of a control unit 112.

The first electrical connection 103 is coupled to a first input terminal of the switch unit 104. The switch unit 104 has a first output terminal coupled to a second electrical connection 105 electrically coupling the switch unit 104 and thus the electrical power control device 101 to a first electrical load 106. The switch unit 104 includes a second output terminal coupled to a third electrical connection 107 coupling the switch unit 104 and thus the electrical power control device 101 to a first input terminal 108 of a distribution board 109.

The switch unit 104 has a second input terminal connected to a fourth electrical connection 110 coupling an output terminal 119 of the distribution board 109 to the switch unit 104 and thus the electrical power control device 101.

The electrical power control device 101 includes a power detector unit 111 coupled to the first electrical connection 103 via a connection 118 and arranged to detect the electrical power generated by the renewable power source 102. The renewable power source typically comprises a renewable power generator (such as a wind turbine or photovoltaic array) which is connected to a power inverter which converts electrical energy generated by the renewable power generator into a suitable waveform, such as a single phase AC waveform suitable for integration into a domestic electrical supply.

The power detector unit 111 is coupled to the control unit 112 arranged to control the operation of the electrical power control device 101 and, as described above, in particular the switch unit 104. In operation the power detector unit 111 inputs a power detection signal to the control unit 112 corresponding to the electrical power currently being generated by the renewable power source 102. In this way, the control unit 112 can determine whether or not the renewable power source 102 is generating power at above or below a predetermined threshold power level.

The electrical power control device 101 further includes a circuit detection unit 113 so coupled to the control unit 112. The circuit detection unit 113 is arranged to detect, via a power detection connection 114, if the first load 106 requires power.

Typically, the first load 106 will require power if a control unit of the load 106 (not shown) has switched the first load 106 to an "on" state, for example if the load 106 is a water heater, the control unit may be a thermostat.

In some examples the power detection connection 114 may be connected to a power supply connection (for example voltage free contacts) of the first load 106. In this case, if the connection 114 is in a closed circuit state, this indicates that the load has been switched to an "on" state and requires power (for example if a thermostat has detected that the temperature of the water in a water heater has dropped below a certain level).

In other examples, the connection 114 may be connected to the control unit of the load 106 (for example directly to a thermostat control unit). In this case, the connection 114 may convey an electronic signal from the control unit of the load 106 to the circuit detection unit 113 indicating whether or not the load 106 is in an "on" state and requires power. In either case, the connection 114 enables the circuit detection unit 113 to determine if the load 106 requires power. If the circuit detection unit 113 determines that the load 106 requires power, the circuit detection unit 113 sends a signal to the controller 112.

As will be understood, by virtue of this arrangement, the control unit 112 can determine if the load 106 requires power and if the renewable power source is generating power above the threshold level.

The distribution board 109 is connected to an electrical supply grid 115 via a grid supply electrical connection 116 connected to a second input terminal 117 of the distribution board 109. Further electrical loads 120, 121, 122, are coupled to further output terminals 123, 124, 125 of the distribution board 109.

lo In operation, the system shown in Figure 1 is arranged so that if the first load 106 requires power, and if the renewable energy source 102 is generating power above a threshold level, then the distribution board (and thus the electrical supply grid 115) is electrically isolated from the first load 106 and the first load 106 receives electrical power exclusively from the renewable power source 102. On the other hand, if the renewable energy source is generating power above or below the threshold level but the load 106 is not calling for power via connection 114, any power generated by the renewable power source 102 is directed to the distribution board 109 where it is combined with power from the supply grid to power 115 and used to power loads being powered from the distribution board. This can include the first load 106 itself if the load 106 requires power but the renewable power source 102 is not generating the threshold level of power.

In some examples, this can also include the first load 106 itself if the first load 106 requires power but is not sending a signal to the closed circuit detector 113 via the connection 114 and the power source 102 is generating above the threshold level of power.

The operation of the system shown in Figure 1 will now be described in more detail.

Below Threshold Power If the control unit 112 determines that the power detection signal indicates the renewable power source 102 is currently generating electrical power below the threshold level the control unit 112 is arranged to electrically couple the first electrical connection 103 with the third electrical connection 107 thereby electrically connecting the renewable power source 102 to the distribution board 109 via the first input terminal 108. In this way, electrical power provided from the supply grid 115 via the grid supply electrical connection 116 can be used to power the further electrical loads 120, 121, 122 in combination with any electrical power generated by the renewable power source 102. Further, the switch unit 104 is arranged to electrically connect the second electrical connection 105 and the fourth electrical connection 110 thereby connecting the output terminal 119 of the distribution board 109 with the first electrical load 106. In this way, electrical power provided from the supply grid 115 via the grid supply electrical connection 116 can be used to power the first electrical load 106 in the event that it requires power. As will be understood, any power that is generated by the renewable power source 102 may contribute to power input to the load 106 as below threshold power generated by the renewable power source 102 is directed via the switch unit 104 to the distribution board 109.

Above Threshold Power If the control unit 112 determines that the renewable power source 102 is generating power above the threshold level but that the load 106 does not require power, then the control unit is arranged to couple the renewable power source 102 to the distribution in the same manner as if the renewable power source was generating power below the threshold level. In this way, if the load 106 does not require any power, all power generated by the renewable power source 102 is sent to the distribution board 109 and can be used to power the further electrical loads 120, 121, 122. The load 106 can still receive power in this way along with loads 120,121 and 122 if load 106 calls for power but does not send a signal to connection 114.

On the other hand, if the control unit 112 determines that the renewable power source 102 is generating power above the threshold level and that the load 106 requires power via connection 114, then the control unit 112 controls the switch unit 104 to disconnect the renewable power source 102 from the distribution board 109 by disconnecting the first electrical connection 103 and the third electrical connection 107 thereby isolating the renewable power source 102 from the distribution board 109. The control unit 112 also controls the switch unit 104 to disconnect the fourth electrical connection 110 and the second electrical connection 105 thereby isolating the load 106 from the distribution board and controls the switch unit 104 to connect the first electrical connection 103 and the second electrical connection 105 thereby connecting the renewable power source 102 to the load 106. In this way, in the event that the renewable power source is generating power above the threshold level and it is determined that the load 106 requires power via connection 114, the load 106 is electrically isolated from the distribution board and is powered exclusively from the renewable power source 102.

It will be understood that the system shown in Figure 1 can provide power to the first load 106 from the renewable power source 102, even in the absence of the third 107 and/or the fourth 110 electrical connection connecting the electrical power control device 101 to the distribution board. For example, if a cable comprising both the third 107 and fourth 110 electrical connections was disconnected or not installed, the electrical power control device 101 would still power the first load 106 once the threshold level of power was being generated and the load 106 was calling for power.

If only the fourth 110 electrical connection was disconnected the electrical power control device 101 would still have the ability to power the first load 106 and the distribution board 109 with only the option to power the first load106 from the output terminal 119 of the distribution board 109 being removed.

Multiple Loads In certain embodiments, the control device 101 is connected to more than one load.

In such embodiments, the control unit 112 of the control device 101 can determine whether each load requires power as each load is typically connected to the circuit detection unit 113 by a power detection connection corresponding to the power detection connection 114 described above.

In such embodiments, the control device 101 operates as described above in that if the renewable power source generates power above the predetermined threshold and if one of the loads requires power, the renewable power source is disconnected from the distribution board by the switch unit 104 and is connected to the load that requires power. At the same time, the switch unit 104 allows all of the loads that are not calling for power to be fed from the distribution board. In this way, the load requiring power is the only load powered exclusively by the renewable energy source.

In the event that more than one of the loads requires power, the control unit 112 is arranged to control the switch unit 104 to connect the renewable power source to the loads requiring power on a predetermined priority basis. As long as the maximum electrical output power of the renewable power source 102 is not exceeded more than one load can be fed exclusively from the renewable power source. For example, if the control device is connected to three loads, the first of the loads may be allocated a top priority, a second of the loads may be allocated a second priority and a third of the loads allocated a bottom priority. Thus, for example, if the first load and second load both require power, the control unit 112 controls the switch unit 104 to connect the first load to the renewable power source. If the control unit 112 detects that the first load no longer requires power, then it controls the switch unit 104 to connect the renewable power source 102 to the second load. If the total electrical load requirement of both the first and second loads is less than or equal to the maximum electrical output power of the renewable power source 102 both the first and second loads would be fed from the renewable power source 102 The third load is only connected to the renewable power source in the event that it is detected that is requires power, but neither of the other loads require power or if the total electrical load of the third load and any of the other two loads which require power is less than or equal to the maximum electrical output power of the renewable power source 102.

The predetermined priority can be programmed into the controller unit 112.

The maximum electrical output power of the renewable power source 102 can be programmed into the controller 112 The electrical power requirements of each load 106 can be programmed into the controller 112 The threshold power level can be set/programmed into the control unit 112.

In certain embodiments the load 106 is an energy storage load such as an immersion heater or storage heater. However, it will be understood that the load 106 can be any suitable electrical load that requires electrical power normally supplied by the distribution board 109.

Figure 2 to 5 provide schematic diagrams illustrating in further detail, implementations of embodiments of the invention.

Figure 2 shows a system including the following components: A renewable energy source 201 such as photo voltaic array or wind turbine.

An inverter 202 for converting electricity produced by the renewable energy source 201 into mains electricity.

A generation meter 203 for measuring the amount of electricity produced by the renewable energy source 201.

A renewable electrical power distribution controller (REP-DC) 204. The REP-DC 204 provides an example of an electrical power control device.

A network supply 205 from the national grid.

zs Incoming supply meters 206.

An optional dual tariff/off peak supply meter 207. The optional dual tariff/off peak supply meter 207 can be integrated into a single meter.

A main distribution board 208 feeding heating/lighting/ power to the premises.

Isolators 209.

A permanent supply 210 feeding the REP-DC 204. The permanent supply consists of a live, neutral and earth connection.

A dual tariff/off peak distribution board 211. The feeds, which are the final circuits 5 212 which pass through the REP-DC 204 to storage loads 216 (discussed in more detail below), may be direct from the mains distribution board 208 depending on off peak meter arrangements.

Final circuits 212 feeding equipment supplied from normal supply/off peak supply.

Auxiliary inputs 214.Typically, the number of inputs will match the number of outputs. This can be anything from one upwards with no upper limit beyond what is practicable.

Auxiliary outputs 215, typically fused from the renewable energy source 201 or forming a through connection from 214. Typically, the number of auxiliary outputs 215 will depend on the size (i.e. the maximum power output) of the renewable energy supply 201 and/or the circuits 212 the REP-DC 204 is controlling with no upper limit beyond what is practicable. Typically the number of auxiliary inputs 214 will also match the number of outputs 215 as together they form a "zone" as detailed below with reference to Figure 4.

Loads 216 connected to the final circuits 212. The loads 216 connected can be any form or electrical load or equipment. These can be (but not limited to) night storage heaters/immersion heaters/convector heaters.

Switching circuits 217 controlling each zone relay. Zone relays are described in further detail with reference to Figure 4 they are formed by the auxiliary input 214, the respective connections to the input 255 and 256, the fuse 251, the double pole relay 229 and the respective output 215, an override switch 230 and the switching circuit 217.

Note that if both the final circuits 212 from the distribution board 208 to the REP-DC 204 and the cable from the REP-DC terminals 231 to the distribution board 208 are omitted, with a permanent power supply 10, the arrangement of Figure 2 will work as a standalone unit directing electrical power to respective loads when power is called for and as dictated by the programming of the REP-DC 204.

Note that if part of the final circuits 212 from the distribution board 208 to the REP-DC 204 are omitted, with a permanent power supply 10, the arrangement of Figure 2 will work as a device which feeds power into the distribution board without the ability to supply any connected loads below the threshold value when the zones are not calling for power to the REP-DC and directing electrical power to respective loads directly from the renewable supply when power is called for and above threshold level and as dictated by the programming of the REP-DC 204 Note that if the cable from the REP-DC terminals 231 to the distribution board 208 is omitted, with a permanent power supply 10, the arrangement of Figure 2 will work where no electrical power generated will be fed into the distribution board however the loads can be supplied by the grid supply / distribution board and the REP-DC will direct electrical power to respective loads directly from the renewable supply when power is called for and above threshold level and as dictated by the programming of the REP-DC 204 Figure 3 provides a more detailed view of an example of an electrical power distribution controller REP-DC 204 in accordance with embodiments of the invention.

The electrical power distribution controller 204 shown in Figure 3 includes the following components: Isolators 209.

A live feed 210. The live feed 210 is a permanent feed to provide power to a programmable controller 221 discussed in more detail below.

An auxiliary input 214. The auxiliary input 214 provides a connection point for cabling which is fed from the main distribution board 208 or from the off peak distribution board 211. The auxiliary input 214 acts as terminals which form part of the through connection via a zone relay 229 to the auxiliary outputs 215 which connect directly to the loads 216 for each zone. When the REP-DC 204 is switched off or the REP-DC is not redirecting power from the renewable energy source 201 to the connected load 216, a straight through connection exists between terminals 214 and 215. These connections consist of a live, neutral and earth connection points.

lo Auxiliary outputs 215 which are typically fused by a circuit protective device fed from renewable energy source. Note the number of outputs will depend on the size of the renewable energy supply 201 and/or the circuits the system needs to control. Output terminals for each individual zone which connect to the respective load 216. These consist of a live, neutral and earth connection.

Zone switching control 217. The zone switching control 217 provides control for switching on and off a number of respective zone relays. The zone switching control 217 is provided by an input terminal which provides an input signal to the programmable controller 221 to confirm if a respective load needs to be supplied with power from the renewable source. If the load is calling for power the load generates a signal which is fed into the zone switching control 217 terminals.

The programmable controller 221 consists of a mains isolator switch, power supply unit and programmable controls. The programmable controller 221 allows the REP-DC 204 to be programmed to requirements of a specific installation. As will be understood by the skilled person, the programmable controller 221 can be provided by any suitable programmable unit for example an Arduino Uno or Mega unit, suitably configured to meet the requirements of the REP-DC 204.

"Installation" is a general term referring to the number of loads connected to the outputs 215 of the REP-DC and the size of each individual load connected to each output 215 of the REP-DC.

The output 215 could also be classed as a zone auxiliary output as detailed further in Figure 4.

The control circuit (i.e. programmable controller 221 shown in Figure 3) can monitor the status of the supply (i.e. the mains supply) and if required, may be able to maintain a link to keep the frequencies of both supplies in sync. This can be achieved by allowing a carrier signal to pass through the programmable controller 221 and into the generation meter 203 and the inverter 202. The controller allows the incoming mains supply from the supply grid 205, which is not restricted to but includes the voltage and frequency, to be measured by the Inverter. Control equipment in the inverter could then use this signal to match the frequency of the mains supply and measure the incoming mains voltage from the supply grid 205 and allows a connection to be maintained between the inverter 202 and the incoming supply from the national grid. In addition the part of the controller 221 which monitors the power measured by the current/voltage measuring device 226 could be integrated with a timer. When the renewable supply 201was generating power above the threshold value the timer would delay for a set period, any signal indicating the power generated by the renewable supply 201 had fallen below the threshold value. Once the renewable source produced power above the threshold value the timer would reset. This would reduce constant operation of the relays when there was dip in power produced by the renewable source such as short periods of cloud cover on a Photo Voltaic array or the operation of the relays temporarily removing power to the load.

zs An on/off isolator switch 222 to allow the REP-DC 204 to be isolated from the renewable energy source 201. Electricity generated from the renewable energy source 201 passes through the inverter 202 and generation meter 203 into the REP-DC 204 through relay R1 (i.e. primary relay 228) and out of the REP-DC 204 and directly to the distribution board 208. All electrical power generated by the renewable energy source 201 feeds into the electrical system supplying power as it is required.

Main fuses (F1) 223 provide protection of the REP-DC 204. The main fuses 223 (protective circuit device) protect the maximum load capacity of the REP-DC 204 which is fed by the renewable energy source 201.

A primary input 225. The primary input 225 provides a connection point for the AC voltage output from the inverter 202. The primary input 225 consists of a live, neutral and earth connection.

A current/voltage measuring device 226. When the REP-DC 204 is switched on current/voltage measuring device 226 measures the output of power from the renewable energy source 201. The measuring device can measure either voltage or current or a combination of both.

Note that there is an understanding that the design of the inverter would not allow current will flow into the generation meter/inverter when the renewable supply is not producing any electricity as the inverter would therefore be acting as a load connected to the distribution board using energy. This would confirm that any current measured by the device 226 would be produced by the renewable supply. If this is not the case then a separate signal would need to be sent to the programmable controller confirming that the renewable energy supply is producing electricity.

When there is no renewable energy being produced the measuring device 226 will allow the electrical installation to operate as normal (i.e. the loads will obtain their power from the electrical distribution board fed by the national grid). Once electrical energy is produced by the renewable energy source 201 that is over a set level (as measured by either voltage or current or a combination of both) and the programmable controller 221 is switched on, and the connected loads are "calling" for a supply, the loads will be powered by the renewable energy source 201 as dictated by the programming parameters.

The loads call for supply by providing a signal to the input 217 which is the input terminal which provides the input signal to the controller to confirm if the respective load needs to be supplied with power from the renewable source. In the event the loads are calling for power, the programmable controller 221 will control a primary relay 228 breaking the supply to the distribution board 208 and allow these the zones 233 to operate under control within the programming and feed the respective loads from the renewable electrical energy source. This is how each zone is prioritised to operate in a sequence and also if zones are to operate in groups, for example, two at a time. The term "controlled conditions" means when the programming parameters are met for zones to operate in their specific priority sequence and grouping.

The programmable controller 221 can be programmed such that the number of zones and the sequence of operation of the zones can be programmed to ensure the maximum load the renewable energy source 201 can supply is not exceeded.

A primary relay 228. In some examples this is a double pole relay. When primary relay 228 switches it isolates the power produced by the renewable energy source 201 from the distribution board 208. When the REP-DC 214 is switched off or the loads are not calling for the energy produced by the renewable energy source 201, the primary relay 228 is in its normally closed state and allows the generated power to flow to main output terminals 231.

The primary relay 228 is typically interlocked with control zone relays 229.

"Interlocked" means that the controller will not allow the zone relays 229 to operate until the primary relay 228 is showing that it has opened in the controller and the controller will not allow the primary relay 228 to close again if the controller has operated any of the zone relays 229. This could be achieved by additional voltage free contacts on each relay where the controller can monitor the open I closed state of these contacts.

The control zone relays 229 typically cannot operate until the main relay 228 is energised and the power is removed from the primary output terminals 231 (the primary output terminals are 231 shown in Figure 3 and Figure 4).

Control Zones 233. Note the control zones 233 are described in more detail with reference to Figure 4. The number of control zones 233 will vary depending on the number of loads connected to the REP-DC 204. Each control zone 233 is typically formed by an auxiliary input 214 an auxiliary output 215, a relay 229, a supply from the primary input, a zone fuse 251 a switching circuit 217 and an override switch 230 and part of the control circuit 221. The final circuit 212, which has a load connected through the REP-DC 204 via a control zone, has the option to be fed by the conventional electricity supply via the distribution boards 208, 211 or the renewable energy source 201 depending on the status/position of the zone relay 229.

In the arrangement shown in Figure 3, relays are shown as the main form of so switching of the REP-DC 204. The system can also be designed to utilise contactors or another current form of switching as a replacement to the relays.

Figure 4 provides a schematic diagram of a configuration of a zone 233 within the REP-DC 204. Figure 4 depicts the following components: Final circuits 312 feeding equipment supplied from off peak supply from the off-peak distribution board 211.

The auxiliary input 214 providing the connection point for cabling which is fed from the main distribution board 208 or the off peak distribution board 211.

The auxiliary outputs 215. The auxiliary outputs 215 are typically fused 251 from the renewable energy source 201 to ensure each individual load connected to the REP-DC zone 233 Figure 3 has its respective cable protected. For example, the supply feeding into the REP-DC 204 could be 4 kWs however the final circuit cables feeding the loads could only carry 3 kWs. The fuse therefore provides the correct protection to ensure the cables are correctly protected.

Typically, the number of auxiliary outputs 215 will depend on the size of the renewable energy supply 201 and/or the circuits (i.e. the wiring circuits 212 which are connected to the REP-DC 204 outputs 215 including the loads and the size of each load) that the REP-DC 204 needs to control. Typically, this number will also match the number of auxiliary inputs 214 of the REP-DC 204.

Switching circuit 217 controlling each zone relay. The switching circuit feeds back a signal to the controller to confirm if the load is calling for power.

A primary relay 228. Typically the primary relay 228 is a double pole relay. Note that this relay can also be a contactor or a similar electrical device which will break the supply when operated.

One or more zone relays 229. The zone relay 229 typically comprises a double pole lo relay. If the zone relay 229 is not energised this allows the electricity to flow directly through the REP-DC 204 to the auxiliary output terminals 215. If the relay is energised the electrical power produced by the renewable energy source 201 is fed to the auxiliary output terminals 215 via the zone fuse 251 and onto the respective connected load 216. Typically the zone relay 229 can also be a contactor or a similar electrical device which operates in the same manner as a relay.

An override switch 230. When the override switch 230 is operated then the zone is removed from circuit and will not operate. This means the programmable controller 221 sees this zone as not calling for power whatever the status is of the respective switching circuit 217 of that zone and will not allow the zone to operate. The REP-DC 204 sees this zone as being satisfied and not calling for any power.

Primary output 231. The primary output 231 typically comprises output terminals providing electrical energy produced by the renewable energy source 201 when the controller 204 is not calling for or redirecting power to any of the specific loads connected to the auxiliary outputs 215. These consist of a live, neutral and earth connection.

A zone fuse 251. Each zone will have a fuse to allow protection of the circuit it is feeding. It will be understood that any suitable protective device can be used in place of the zone fuse 251 shown in Figure 4.

An AC supply rail 255. Typically, all zones are supplied from this rail. The AC supply rails is supplied from the primary input 225. AC supply rail 256. This connects to main the relay (which is the primary relay 228) after the last zone connection.

Figure 5 provides a schematic diagram of a connection of a load through a zone as described above with reference in particular to Figure 4.

Under normal conditions a load such as an immersion heater 263 is controlled by a time clock 260 and a thermostat 261. If the time clock 260 operates requiring water so in the immersion heater 263 to be heated and the thermostat 261 is calling for heat then the immersion heater 263 will be heated via the distribution boards 208, 211.

Assuming the REP-DC 204 is a single zone control unit (i.e. with just one zone), if at any time the renewable energy source 201 (shown for example in Figure 2) produces power above a set threshold value then the primary relay 228 (shown for example in Figure 4) will open and the zone relay 229 will operate. This assumes that there is a signal at the switching circuit 217 calling for power via the thermostat 262.

This will allow the renewable energy source 201 (shown for example in Figure 2) to feed the immersion heater 263 and be controlled by the thermostat 262. If the thermostat 262 is not calling for heat then the zone relay 229 will not operate and remain in the normally closed position and the primary relay 228 will remain closed and the renewable energy source 201 will continue to feed through the REP-DC 204 and into the electrical distribution system via the distribution board 208 (shown for example in Figure 2) allowing the renewable energy source 201 to support the rest of the loads connected to the distribution board 208.

If a night storage heater was to be connected through the REP-DC 204 then the immersion heater 263 could be removed and the final circuit cable connected to the input of the night storage unit. The thermostat 262 could be replaced by a relay which would be configured to operate when the night storage unit was at its maximum charge. The thermostat 261 could be removed from the circuit and the time clock would be optional.

Operation of the Electrical Power Distribution Controller (REP-DC) The renewable energy source 201 produces electricity which is converted to alternating current (AC) which passes through the generation meter 203 and isolator 209 into the REP-DC 204.

When the REP-DC 204 is switched to the off position (for example, by removing so power to the permanent supply 210), this allows all power to flow through the REP-DC. The primary relay 228 is set to normally closed and all zone relays 229 are set to normally closed.

The supply renewable supply connected to the primary input terminals 225 feed directly through to the primary output terminals 231. This allows any load 216 that is connected through the REP-DC 204 via the auxiliary input 214 and the auxiliary output 215 to operate as normal (i.e. the loads 216 obtaining their power from electrical distribution board fed by the national grid).

The REP-DC 204 has a control system provided by the programmable controller 221 which can be programmed to control the REP-DC 204. This programming allows for the operation of the primary relay 228 and the auxiliary relay i.e. zone relay 229 once certain conditions are met.

When the REP-DC 204 is switched on the power produced by the renewable energy source 201 feeds into the REP-DC 204 and is measured by the current/voltage measuring device 226.

If the power produced by the renewable energy source 201 remains below a pre-set 30 threshold value as measured by the current/voltage measuring device 226, the programmable controller 221 prevents any power from being redirected to the zones and allows any power to flow through the REP-DC 204. As with the above, the supply connected to the terminals of the primary input terminals 225 feed directly through to the primary output terminals 231.

If the power produced by the renewable energy source 201 rises above the pre-set threshold value as measured by the current/voltage measuring device 226, then a signal is sent to the programmable controller 221.The current/voltage generated is measured by the measuring device 226. This is fed into the programmable controller 221 and is compared against the set threshold value which is programmed into the programmable controller 221.

The programmable controller 221 will then determine if the loads connected to the zones 233 are calling for power. This can be checked by the switching circuit 217 which forms part of each zone 233. In this example, if the switching circuit 217 has an open circuit then the load is satisfied. If the switching circuit 217 has a closed circuit then the load is calling for power.

Typically, each zone 233 also has an override switch 230. If the override is operated forming a closed circuit then this sends a normally closed signal as the zone switching circuit 217 to the programmable controller 221. This signal is generated by making the switch form a closed circuit within the programmable controller 221 isolates the zone. The programmable controller determines that the load is satisfied therefore stopping the operation of the respective zone relay 229. If the override switch 230 is operated for a zone 233 this effectively removes that zone 233 from the system.

If all zones 233 have their override switches 230 operated and/or the switching circuits 217 for each zone 233 are not calling for power then the zone relays 229 and the primary relay 228 cannot operate and remain closed. As with the above, the supply connected to the terminals of the primary input terminals 225 feed directly through to the primary output terminals 231.

If the power produced by the renewable energy source 201 falls below this pre-set threshold value as measured by the current/voltage measuring device 226 the programmable controller 221 opens any zone relays 229 and then closes the primary relay 228 allowing power to flow through the RED-DC 204. As with the above, the supply connected to the terminals of the primary input terminals 225 feed directly through to the primary output terminals 231.

Zone relay operation/programming The zone relays 229 can be "programmed" to operate either individually or in banks of two upwards at any one time as dictated by the output power of the renewable supply 201 and the power requirements of the loads 216. The zone relays 229 are "programmed" in that the programmable controller 221 is programmed to control the relays 229. This will be dependent on the power output of the renewable energy source 201 and the loads connected to the REP-DC 204.

For improved efficiency the loads typically "match", however this is not essential.

"Match" in this context means trying to ensure the power output from the renewable energy source is the same as the power rating of the loads that are connected to the source via the REP-DC at any one time.

The number of zone relays 229 allowed, by the programmable controller 221, to operate at any one time will depend on the capacity of the renewable energy source 201 (i.e. the amount of power the renewable source can produce) and the loads 216 connected to each zone 233.

The maximum output of the renewable energy source 201 is programmed into the programmable controller 221 of the REP-DC 204 along with the size of the load 216 connected to each zone 233. Typically this is in kWs and can be in multiples of, for example, 100 watts but as will be understood implementation is not restricted to this step value.

The programming of the programmable controller 221 will ensure that the total load being fed by the zones 233 when each zone 233 operates does not exceed the maximum power which can be supplied by the renewable energy source 201.

Matching of loads to the renewable energy source 201 is not essential but leads to efficient use of renewable energy when using this invention.

In some examples, each zone 233 of the device is set up to operate in order of priority.

This priority will depend on the loads 216 connected to each zone 233 and the specific requirements of the end user.

The below examples explain the operation further.

The programmable controller 221 reviews, by comparing the values manually programmed into it, the power which can be generated by the renewable energy supply and the size of the loads connected to each zone 233 and will restrict the number of zones 233 which operate to ensure the total load will not be greater than the capacity that the renewable energy source 201 can produce.

For any zone 233 which is calling for power via the switching circuit 217 the prioritisation of each zone 233 along with the size of load connected allows the 20 programming to divert power to a connected load by operating the relative zone assuming the following programming parameters are met:- 1. The renewable energy source 201 is generating power above the set threshold value set within the programmable controller 221.

2. The zones 233 are calling for power via the switching circuit 217 and the zone 233 is not overridden by the override switch 230.

3. The number of zones 233 which can operate will be restricted to ensure the total load remains below the power output of the renewable energy source 201.

The programmable controller 221 will then assess which zone 233 is calling for power as described above. Note that the primary relay 228 must typically be open before any of the zone relays 229 can close.

The below shows examples on how various loads could be operated: Example 1 -Individual zone operation.

A 3 kW renewable energy source with 1-3kW immersion heater and 2-3kW night storage units integrated into a 3 zone REP-DC unit.

* Zone 1 -Connected to Emersion heater(3kW) * Zone 2 -Connected to night storage unit A(3kW) * Zone 3 -Connected to night storage unit B (3kW) * Loads are balanced and equal.

io * The zones are programmed to allow for one zone to operate at any one time.

This is achieved by manually inputting the information into the programmable controller. This includes the power output of the renewable supply in Kilowatts, the total power requirement of the load connected to each zone in kW and the priority/sequence that the zones should operate when the respective switching circuit 17 is calling for power. The programmable controller then compares this manually inputted data and ensures that the zones operate in order of priority/sequence while ensuring that the total load directly connected to the renewable supply is not exceeded and with the comparison of the supply and the loads.

* The zones are prioritised as zone 2 takes first priority followed by zone 1 taking second priority and then zone 3 taking third priority.

When the renewable energy supply exceeds the pre-set threshold and at least 1 zone is calling for power, relay R1 (the primary relay 28) opens. If zone 2 is calling for power then this will operate as it has been given priority in the programming. Both zone 1 and zone 3 cannot operate as the programmable controller has been set to allow for only 1 zone to operate at any 1 time. Zone 2 relay will operate and the supply to the load will be fed from the renewable energy source.

If zone 2 receives a signal via its switched input to say it no longer needs power or the override (i.e. override switch 30) has been operated for zone 2, then the zone 2 relay will move to normally closed and zone 1 will operate if calling for power as this has second priority in the programming and the supply to the load connected to zone 1 will be fed from the renewable energy source.

If zone 2 and zone 1 both receive a signal calling for power for that zone from the respective switching circuit 17 via their switched input to say they no longer need power or the overrides have been operated for zone 2 and zone 1, then zone 2 and zone 1 relays will remain normally closed and zone 3 will operate as this third priority in the programming.

so The supply to the load connected to zone 3 will be fed from the renewable energy supply.

If zone 2 calls for power at any time (and the zone is not in override) the program will switch off any of the other 2 zones and give priority back to zone 2.

If zone 1 calls for power at any time (and the zone is not in override and zone 2 is not calling for power) the programmable controller will switch off zone 3 and give priority back to zone 1.

If all 3 zones are not calling for power and or have been overridden then all zones will remain in the normally closed position and the primary relay will close allowing power to flow through the unit Example 2 -Dual zone operation with equal loads A 4 kW renewable energy source with 1-2kW immersion heater and 2-2kW night storage units integrated into a 3 zone REP-DC unit.

* Zone 1 -Connected to Emersion heater(2kW) * Zone 2 -Connected to night storage unit A(2kW) * Zone 3 -Connected to night storage unit B (2kW) * Loads are balanced and equal.

* The zones are programmed by manually inputting the information into the programmable controller. This includes the power output of the renewable supply in Kilowatts, the total power requirement of the load connected to each zone in kW and the priority/sequence that the zones should operate when the respective switching circuit 17 is calling for power. The programmable controller then compares this manually inputted data and ensures that the zones operate in order of priority/sequence while ensuring that the total load directly connected to the renewable supply is not exceeded. The programmable controller is therefore set up to allow for 2 zones to operate at any one time assuming power does not exceed maximum load * The zones are prioritised as zone 2 takes first priority followed by zone 1 taking second priority and then zone 3 taking third priority.

As detailed above, the programmable controller allows the two zones which are set to the higher priority and are calling for power to operate.

When the renewable energy source exceeds the pre-set threshold and at least 1 zone is calling for power, relay R1 opens. If zone 2 and zone 1 are calling for power then these will operate as they have been given first and second priority in the programming and the system allows for two zones to operate at any one time as long as the renewable supply capacity has not been exceeded. Zone 3 cannot operate as the system has been set to allow for only two zones to operate at any one zo time.

If either zone 2 or zone 1 receives a signal calling for power for that zone from the respective switching circuit 17 via its switched input to say it no longer needs power or the override has been operated for zone 2 or zone 1, then the corresponding zone relay will move to normally closed for that zone and if zone 3 is calling for power it will operate as this has third priority in the programming of the programmable controller.

If zone 2 or zone 1 then calls for power at any time (and the zones are not in override) the program will switch off zone 3 and give priority back to zone 2 or 1.

If all 3 zones are not calling for power and/or have been overridden then all zones will remain in the normally closed position and the primary relay will close allowing power to flow through the unit Example 3 -Dual zone operation with varying loads A 4 kW renewable energy source with 1-3kW immersion heater and 2-2kW night storage units integrated into a 3 zone REP-DC unit.

* Zone 1 -Connected to Emersion heater (3kW) * Zone 2 -Connected to night storage unit A (2kW) * Zone 3 -Connected to night storage unit B (2kW) * The zones are programmed to allow for 2 zones to operate at any one time assuming power does not exceed maximum load. This is done automatically by the controller as it compares the maximum output power of the renewable source and the power required for each load and allows operation of all zones calling for power to operate in their priority sequence as long as the maximum power that the renewable source can produce is not exceeded.

* The zones are prioritised as zone 2 takes 1st priority followed by zone 1 taking 2nd priority and then zone 3 taking 3rd priority.

The system allows the two zones which are set to the higher priority and are calling for power to operate.

When the renewable energy source exceeds the pre-set threshold and at least 1 zone is calling for power, relay R1 (i.e. the primary relay 28) opens. If zone 2 and zone 1 are calling for power then only zone 2 will operate as the operation of zone 1 along with zone 2 would exceed the supply capability of the renewable energy source. The system allows for two zones to operate at any one time as long as the renewable supply capacity has not been exceeded. The programmable controller will therefore review by comparing the information which has been manually input zone 3 and allow this to operate if it is calling for power as the supply capacity will not be exceeded.

If zone 2 receives a signal via its switched input to say it no longer needs power or the override has been operated for zone 2, then the corresponding zone relay will move to normally closed for that zone and zone 1 will operate as this has 2nd priority in the programming.

As zone 1 has operated, the system will switch off zone 3 as this would exceed the capacity of the renewable energy source if both zones were calling for power.

If all three zones are not calling for power and or have been overridden then all zones will remain in the normally closed position and the primary relay will close allowing power to flow through the unit.

Example of Application A typical existing dwelling as well as a new build property will produce hot water and 15 be heated by a system which utilises a non-renewable energy source of energy such as natural gas, LPG gas boiler, air source, ground source heat pump or other nonrenewable energy sources of fuel such as wood or coal.

To maximise the benefit of embodiments of the invention, the design and installation of the electrical system can include the integration of the associated wiring to incorporate the REP-DC and associated loads in preparation for the connection of a renewable energy source of electrical supply.

On a typical new-build dwelling with a cylinder for hot water and a gas heating system, an electrical design might allow for a 3kW renewable energy source supply to be connected such as a photo voltaic (PV) system along with a REP-DC according to an embodiment of the present invention, with connections to an immersion heater for the hot water and two night storage heaters.

The night storage heaters would be strategically sited and would provide a secondary source of heating from the renewable supply to supplement, for example, gas central heating. The loads would match the renewable supply to maintain the maximum use of the energy produced by the renewable power source. The system could incorporate a three zone implementation of a REP-DC in accordance with the invention, fitted close to the distribution board.

The three circuits would be wired from the invention to allow for the following to be installed in conjunction with the PV array: Zone 1 -Wiring for a 3kW immersion heater as shown for example in Figure 4.

Zone 2 -Wiring for the installation of a strategically located 1.5kW night storage heater with switching controlled through a relay to give best use of the heat produced by the storage heater.

Zone 3 -Wiring for the installation of a strategically located 1.5kW night storage heater with switching controlled through a relay to give best use of the heat produced by the storage heater.

The wiring to these night storage units in zones 2 and 3 would be from a REP-DC in accordance with an embodiment of the present invention.

zo There would be no connection from the distribution board to Zones 2 and 3 of the present invention which would mean that the night storage units would only receive electrical energy from the renewable energy source.

The immersion heater has the option to be supplied via the mains incoming supply of the renewable energy source. The programming would be set up for zone 1 for have priority with zones 2 and 3 connected to the renewable supply when zone 1 is satisfied. This would allow all energy produced above the threshold value to be fully utilised over the majority of the year as the night storage heaters would store all the energy produced and releasing their stored energy when the home owner/occupier requires the property to be heated. This would save on the energy needed to be used by the main gas heating system.

In some examples this can give close to 100% utilisation of the energy in form of heat rather that the current expectation of 50%.

Embodiments of the invention have the potential to have a major impact on improving the environmental impact of every property where the above application is applied.

In some embodiments, if there was a risk that the capacity of the night storage units could be reached during a typical period when the renewable energy source was producing energy, and then additional zones could be added along with further night storage units. These would switch over to store the energy when zones 2 and 3 were satisfied Typically, only single phase loads can be connected to examples of the REP-DC described above. If there are multi phases connected then a REP-DC would typically need to be installed on each individual phase.

Examples of loads which can be connected to examples of the present invention include immersion heaters, night storage units, convector heaters and similar zo devices.

The examples of the invention described above are described mainly in terms of a single renewable energy source. However, it will be understood that in some examples, there could be a number of renewable electrical supplies which generate electricity under differing conditions which form part of an electrical system. The REP-DC could integrate into each renewable supply to produce similar benefits during the generation of electrical energy.

The system can be integrated into existing wiring such as night storage units and immersion heaters allowing the existing systems to operate normally when the REP-DC is switched off or there is no renewable energy being produced.

The number of zones required on an installation will depend on the number of individual loads to be connected to the REP-DC and the maximum electrical output from the renewable energy source.

In examples of the invention, the REP-DC prioritises the use of the renewable energy produced to feed any loads connected to this unit. The power generated by the renewable energy source is directed to a loads connected to the REP-DC such as night storage units and immersion heaters.

so The stored energy in the night storage units/water storage cylinder can be released into the building or used at a time when the required by the consumer therefore reducing the need to use energy from none renewable energy sources to provide this heating.

The loads connected to the auxiliary output terminals 215 of the REP-DC 204 can be resistive, capacitive and inductive loads with or without electronic controls.

Loads connected to the control device can be matched with the renewable energy source for maximum efficiency. This will maximise the utilisation of the renewable electrical energy generated.

In a typical implementation, all equipment and components associated with the embodiments of the invention will confirm to the current relevant standards, for example the British standards and IEE regulations in force at the time of manufacture and installation or conform to the relevant standards in place in any respective country. Typically, all equipment and components associated with the invention will be earthed to the current regulations/standards of that country.

Note that if the connections from the distribution boards 208 or 211 (see for example figure 2) to the connections 214 of the REP-DC 204 are not essential for operation of examples of the invention. If a cable(s) providing this connection is not installed then the system would not provide any power to the storage load 216 from the renewable supply or the electricity supply grid if the power generated by the renewable supply was below the threshold value or none of the loads 216 were sending a signal to the zone switching control 217 calling for power when the renewable supply 201 was above the threshold value.

Note that the connection from the output 231of the REP-DC 204 (see for example Figure 4) to the main distribution board 208 via the isolator 209 is not essential for operation of examples of the invention. If a cable providing this connection is not installed then the system would not provide any feed in power from the renewable supply to the distribution board 208 if the power generated by the renewable supply so was below the threshold value or none of the loads 216 were sending a signal to the zone switching control 217 calling for power when the renewable supply 201 was above the threshold value.

Features, integers, characteristics or groups described in conjunction with a particular aspect, embodiment or example of the invention are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of the features and/or steps are mutually exclusive. The invention is not restricted to any details of any foregoing embodiments. The invention extends to any novel one, or novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

The reader's attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all 30 such papers and documents are incorporated herein by reference.

Claims

CLAIMS1. An electrical power control device adapted to receive electrical power from a first source and a second source, said electrical power control device arranged to output electrical power from a first output and a second output, wherein the first output is arranged to provide electrical power to a first load from the first source, the second source and a combination of the first source and second source, and the second output is arranged to provide power from the first source to combine with the second source, wherein the electrical power control device further comprises a controller arranged to control the electrical power control device, wherein if the controller determines that the first source is providing at least a threshold level of power and that the first load requires power, the controller is arranged to control the electrical power control device to isolate the second output therefore isolating the first source from the second source and to isolate the first load from the second source, and to provide electrical power to the first load exclusively from the first source.
2. An electrical power control device according to claim 1, wherein the second power source is provided via a distribution board.zo
3. An electrical power control device according to claim 1 or 2, wherein the controller is arranged to control the electrical power control device to output electrical power to further loads, wherein the controller is arranged to isolate the further loads from the second source and to provide electrical power to one of the further loads exclusively from the first source if the first source provides at least a threshold level zs of power and if the controller determines that one of the further loads requires power.
4. An electrical power control device according to claim 3, wherein, if the controller determines that more than one of the first load and further loads requires power, the controller is arranged to prioritise to which of the further loads electrical power is provided in accordance with a predetermined priority.
5. An electrical power control device according to any previous claim, wherein the electrical power control device includes a power detector coupled to the controller, said power detector arranged to measure the level of power from the first source.
6. An electrical power control device according to any previous claim, wherein the first source is a renewable energy source.
7. An electrical power control device according to any previous claim, wherein the first load comprises an energy storage load.
8. An electrical power control device according to claim 3, wherein the at least one of the one or more further loads is an energy storage load.
9. An electrical distribution system comprising an electrical power control device according to any previous claim.
10. An electrical power control device adapted to receive electrical power from a first source, said electrical power control device arranged to output electrical power from a first output and a second output, wherein the first output is arranged to provide electrical power to a first load and the second output provides power from the first source to combine with a second power source, wherein the electrical power control device further comprises a controller arranged to control the electrical power control device, wherein if the controller determines that the first source is providing at least a threshold level of power and that the first load requires power, the controller is arranged to control the electrical power control device to isolate the second output therefore isolating the first source from the second source and to provide electrical power to the first load exclusively from the first source.
11. An electrical power control device or an electrical distribution system as hereinbefore described with reference to the drawings.