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Hi,
I simulated a power outage today by shutting the main breaker. My powerwall is set up in a partial backup setup with a subpanel that is backfed by both the powerwall and solaredge inverter. The powerwall was about 90% charged at the time per the app. Everything in the subpanel stayed on as expected but the solar inverter was shut off. Is this correct behavior? Does the powerwall need to be drained a little further before the inverter is allowed back on? I will need to do some further testing but wanted to get an idea of expected behavior first.