Is anyone else interested in micro generation and self-use?
We have 4kWp of SSE-facing solar PV with an immerSUN energy management system configured to enable the charger for my electric car when I have sufficient surplus and/or divert a variable amount of power to the immersion heater. In winter, if there has been insufficient diversion of power to the immersion heater during daylight hours, the gas boiler is set to raise the water temperature to a minimum acceptable value at the end of the day if necessary. A combination of different temperature settings for the immersion heater and gas water heating, and use of the timer on the gas heating controls to delay heating until early evening, ensures maximum use of free electricity while ensuring that there's always hot water after even the dullest day. In summer the combination provides most of the electricity to run my car and almost all our hot water needs at zero marginal cost with no gas use as the hot water tank is large enough to provide more than a day's typical hot water use.