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I am using the Victron BMV-712 Smart to control power distribution to the hot water heater. When the battery is 95% or higher, the BMV triggers a 40 amp relay to send the 12 volt power to the water heater. If the battery fall below 95%, the relay is opened and the solar or alternator energy is...

I will add my input to this discussion. Our campervan is all electric, with exception of the Webasto header and V10 engine, which both run off the fuel tank. The specs are 400 W of solar feeding 200 kWh of lithium batteries, along with the alternator charging when we drive. With this set up...