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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 ...
red31's avatar
red31
Explorer
Dec 15, 2012
I believe your panel is rated at ~4 amps @ 16.5v, to me that means at at radiation of 1000 watts/ meter^2 at some temp, a standard test. So if you use 3000 watts/day * 4 amp = 12.

Page 9 has the data for Houston, 2.9 Max, 2.2-2.9, 2.5 average.
http://rredc.nrel.gov/solar/pubs/redbook/PDFs/TX.PDF

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