I have a hot water system connected to controller load 1 off peak. It does not have an on-peak secondary element. One thing I am attempting to do is turn on as many loads when solar is producing and reduce load when solar production drops. This has been successful with low power devices like pumps via Sonoff Pows and smart control of AC.
Has anyone done anything with smart switches to:
- Run hot water off solar during the day if excess power is available.
- Run on controller load 1 during the night if not enough runtime was achieved during the day.
Definite purpose contactors are available as both transfer switching between feeds and also low voltage switching on/off.
Does anyone have experience with these devices for such a purpose and/or have any recommendations on a particular brand/model that has both dual feed and on/off switching (and one that would be legal to have installed into a DB). A small controller with a low voltage relay could then provide the control over feed selection and power with the smarts coming from OpenHab rule engine.
Or any other suggestions for this. Are their smart circuit breakers for residential DBs that could do this job?
Based on my current solar and off peak usage I could save up to 5kWh per day or 2000 kWh of usage per year not needing to come off the grid while also using cheap off peak if solar has a bad day. So one of the solar power diverters (https://www.solarquotes.com.au/blog/solar-hot-water-diverter-comparison/) don’t make too much sense as they have a multiyear cost to repay.