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HiTech's avatar
HiTech
Explorer
Dec 14, 2012

Measuring solar yield approaching winter solstice

I need to get a temporary setup on the RV roof to measure solar yield around the winter solstice. How deeply discharged will I need to get my 85 Ah battery so that it allows pretty full production ...
HiTech's avatar
HiTech
Explorer
Dec 15, 2012
red31 wrote:
Turn on one light at dusk and try.

2-3 kWh/m^2/day, so 3*4amp = 12ah/day
http://rredc.nrel.gov/solar/old_data/nsrdb/1961-1990/redbook/atlas/


Very cool! What conversion did you use to get from radiation intentensity to amps or watts? Looks like my guess of 10-15 based on partial day and partial shade data is not way off.

Using that site this should be the winter solstice radiation for the whole country:

December minimum radiation intensity on a flat panel

Jim

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