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Roger, i did start reading that, and will digest that. I was think some of these 3rd party smart chargers might have that capability, or potentially the Tesla 3rd gen smart charger, but the "Smart" part is very low on details.

My car will drain the 30KW remaining in the powerwalls in no time, and i would rather the car uses my cheap SuperOffPeak power, Also discharging the powerwalls to 20% every night seems like a waste. Without charging car, batteries are usually 50-60% charge in the morning when solar starts...

I have 16KW of solar going to 3 powerwalls (whole system is Tesla), whole house is on powerwalls. 8 months of the year (Southern Cal) we can exist on solar/powerwall and draw no power from grid, aside from charging Tesla at night. I don't want Powerwalls to discharge when car starts charging...