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With grid-tie being illegal, there's really not a way to do what you have diagrammed, as far as I know, and I spent several years working towards a large and complex off-grid system before local conditions changed and it became practical for me to grid-connect. In particular, the "draw from solar, supplement from grid" (or questions 2 & 4) part does not ...


The Powerwall is/will be based on the lithium ion battery technology used in the Tesla cars, so instead of a few large lead acid batteries (like in PV battery banks) it will contain a zillion tiny 18650 cells, which work better if you put them in series and let the voltage soar. This keeps the current low while still allowing the same amount of power output ...

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