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To avoid standing heat losses from a water tank and to avoid degrading battery performance over time, I would look into SunAmp heat batteries (used for space heating and/or DHW).
This seems like a similar execution(?):
https://www.youtube.com/watch?v=srPPJPFcnK4&ab_channel=JonathanPorterfieldEcoCars
JonoMarshall
We have a solar edge inverter but from and have a Zappi car charger that can divert excess to the car and are planning to fit the Zappi Eddi that diverts excess to the water heater.