Measuring and acting on solar export

Author	Message
Haxby Guru Joined: 07/07/2008 Location: Australia Posts: 384	Posted: 06:00am 05 Jan 2022       Hi all, I have a single phase 10kw solar inverter and 3 phase power to my house, so the inverter sits on only one of the phases. I need to be able to turn on/off my 3.6kw electric hot water resistive storage heater, based on the solar production at the time. So far it's just been on a timer that turns on at 11am, but I think it's worthwhile to put it on a contactor that can be controlled by a magic Box that can measure excess solar generation. Ideally I'd be after a, say, 0 to 10v analog output corresponding to 0 to 10kw of export power. Is there an ali-express or other commercial box that can do this? It's a little tricky because the box would have to measure all 3 phases and calculate the total power being used/exported.