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  1. J

    Wildly off calculations - what am I getting wrong

    TL;DR We are targeting using 18.800KwH/year for a Norcal home, south facing, assuming 5.5 hrs/day sunlight, "extremely complex roof". My calculations show that I need a 13Kw system with a 125% offset. Tesla's calculations show I need a 18.35Kw system with 103% offset. Who is right? Detail...
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