> Here's the real deal... My '06 Chevy van will slowly
> discharge a battery if let sit for a week or two.
Seems like a lot of draw to me, to be balancing with a portable solar panel.
Lessee, if we assume you are losing 50 Ah over 10 days; that's about 200ma
or 2.4 watts. As a rough rule of thumb, you need an array that will supply
about 10 times that much (peak), so a 24 watt array should do.
This looks like the ticket:
http://www.batterystuff.com/solar-chargers/PF25W.html
But, it's over $300 and unfolds to 41 by 32 so it's not going to fit will on
your dash (unless you have a really large dash).
Of course a smaller array would still help, but eventually the battery would
run down.
Randall
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