DMAC
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DMAC got a reaction from jumper in Running Off-Grid with Infinisolar Super 4kwUpdate:
Scrapped the whole arduino setup and moved to Home Assistant.
got a smart switch which I control based on PV Power, Battery State of Charge.
1. Geyser switch on when PV Power is above 1.3kw and battery above 80%
2. If PV Power drops below 1kw due to cloud coverage, switch turns off until recovery to 1.3kw.
Home assistant
1. added time to 100% and time to 30%.
2. added tracker for maximum PV achieved for the day.
will be adding more automations in the near future, so far HA is the best.
so far, this is the method.