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[aprssig] (Slightly OT) What is solar panel power output?

Tom Hayward tom at tomh.us
Tue Sep 9 20:26:37 UTC 2008


19.88v * 4.78a = 95 watts

95 watts * efficiency of DC-DC converter (say, 80%) = 76 watts

76 watts / 13.2v = 5.76a

So, you get 5.76 amps of current at 13.2 volts.

Tom KD7LXL

On Tue, Sep 9, 2008 at 1:15 PM, J. Gary Bender, WS5N <ws5n at wildblue.net> wrote:
> I am getting closer to setting up my APRS weather and 6 meter PropNET
> stations far enough from the house to make AC power impractical.  I have
> three old solar panels (cost me about $100 used 15 years ago) that I want to
> put into service.  In full sunlight, two of them in parallel put out  19.88v
> open circuit  and  4.78a short circuit.  How does that translate to power
> available at 13.2v nominal for running the rigs and charging the battery?
> -- 73 --
> J. Gary Bender, WS5N
> DM54rp
> Fence Lake, New Mexico USA
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