I have been wondering about this. My aim would be to avoid gas consumption in summer. A battery could take care of cooking the dinner, but an immersion heater would be required for the hot water. A potential problem is that a normal immersion heater takes 3 kW. That would be fine, but if it's a cloudy day, it would defeat the point if some of the leccy had to be bought in. Happily, lower powered immersion heaters are available.

So what I'd like is some form of logic control. So, step 1, send leccy to any current consumption and the rest to the battery. If PV output minus consumption > 2 kW, send it to the immersion heater instead of the battery. If full 4 kW output, send it everywhere. Obviously if battery is full and tank is hot, export the surplus. Is that a possibility?

I have been wondering about this. My aim would be to avoid gas consumption in summer. A battery could take care of cooking the dinner, but an immersion heater would be required for the hot water. A potential problem is that a normal immersion heater takes 3 kW. That would be fine, but if it's a cloudy day, it would defeat the point if some of the leccy had to be bought in. Happily, lower powered immersion heaters are available.

So what I'd like is some form of logic control. So, step 1, send leccy to any current consumption and the rest to the battery. If PV output minus consumption > 2 kW, send it to the immersion heater instead of the battery. If full 4 kW output, send it everywhere. Obviously if battery is full and tank is hot, export the surplus. Is that a possibility?