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As a follow-up to this, we had very high winds in central NJ earlier this week. Storm Watch was onto that and the Powerwalls charged up to 99%. About 12 hours later we lost power and the Powerwalls started to power the house,while the solar inverters shut down because the Powerwalls were full...

In my setup, charging and discharging of the 2 Powerwalls is minuscule. For example, yesterday they put out 0.1 kWh and took in 0.7 kWh. Most of this time they just sit there with SOC 72-73%. The green lights must use a few watts and perhaps there's cell balancing or other maintenance...

I agree there’s a rationale for reducing the charge level in backup-only mode, especially with summer temperatures arriving and long days likely providing good solar production in the event of an outage. I have 2 PWs + Gateway added to a pre-existing 10kW PV array. I got the system only for...