I still think the PG&E EV2-A time of use differential is far worse than a 12% round trip loss in the Powerwalls differential.
Exactly. With $0.30 per kWh rate differentials I can live with some inefficiency in an inverter/battery for the larger benefit of load shifting. Also if we are talking about efficiency, how about the global losses from transmission and distribution on the grid all of which happen before our meter.
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