Is there some site where I can calculate estimated solar panel output if I give it panel efficiency, latitude, tilt angle and panel direction/azimuth? I'm just too lazy to do the trig and also allow for movement of sun through the year.

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@w_pettersson PVWatts is the gold standard for grid tie (so talks about everything in terms of AC kWh, etc.) but is still useful for DC systems since you can adjust losses and they show insolation. pvwatts.nrel.gov/pvwatts.php

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