Hi!
I recently had free (UK government) installed Photo Voltaic (PV) solar panels installed on our house. As part of the deal I can use any electricity as it is generated but the rest gets sold on by the company who installed them. Obviously I would like to get the most out of them and I thought I'd heat some water during the day so I can use it for baths / washing up at night. I already have a copper cylinder - I just need to buy a 1-1.5kW immersion heater (lower power). The system itself is capable of generating almost 3kW.
The panels and inverter still belong to the installers so I cannot touch any part of their setup before it reaches the consumer unit switchboard. Therefore, I'll have to run a cable to the immersion heater and create a circuit which checks for the amount of sun there is and switch the immersion on when it's at a certain level; which can be calibrated by comparing the power output reading on the PV system (digital readout at switchboard) to the voltage created by a mini solar panel I have (the type you get with solar battery chargers).
For example, with my mini PV panel pointing in the same direction as the main panels I can see what voltage it creates when the readout for the main panels shows 1.5kW, then I need to make a circuit which routes power through to the immersion heater whenever this voltage is reached.
This making sense? I've made circuits before but I'm no good at designing them. And I know that a relay will be required but that's about it! Any help would be much appreciated!
I recently had free (UK government) installed Photo Voltaic (PV) solar panels installed on our house. As part of the deal I can use any electricity as it is generated but the rest gets sold on by the company who installed them. Obviously I would like to get the most out of them and I thought I'd heat some water during the day so I can use it for baths / washing up at night. I already have a copper cylinder - I just need to buy a 1-1.5kW immersion heater (lower power). The system itself is capable of generating almost 3kW.
The panels and inverter still belong to the installers so I cannot touch any part of their setup before it reaches the consumer unit switchboard. Therefore, I'll have to run a cable to the immersion heater and create a circuit which checks for the amount of sun there is and switch the immersion on when it's at a certain level; which can be calibrated by comparing the power output reading on the PV system (digital readout at switchboard) to the voltage created by a mini solar panel I have (the type you get with solar battery chargers).
For example, with my mini PV panel pointing in the same direction as the main panels I can see what voltage it creates when the readout for the main panels shows 1.5kW, then I need to make a circuit which routes power through to the immersion heater whenever this voltage is reached.
This making sense? I've made circuits before but I'm no good at designing them. And I know that a relay will be required but that's about it! Any help would be much appreciated!