From what I'm seeing from Fronius and SolarEdge is they are using one of the MPPT ports for solar, and one for battery.
Tesla announces "Powerwall" batteries
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225 volts? That makes no sense. Not what I think. I think Musk is smarter than that and will have a Propitiatory Solution (Expensive) from a Inverter manufacture he chooses as a partner. Wanna bet?MSEE, PEComment
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My point is that for solar they are not planning to do DC-AC-DC, as you alluded. They wouldn't have chosen 400v DC on the output side if that ruined efficiency when charging from solar.
The Model S, when on a supercharger, indicates only 400-405v charging voltage. Which is interesting. And perhaps relevant.Comment
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