Forum Discussion
Ed_Gee
Nov 10, 2015Explorer II
A 20W solar panel is the bare minimum that would keep an unconnected battery charged. If you have any peripheral current drains on the battery, then even the solar panel may not be sufficient. Also, you said it went dead after it had been raining .... indicating that if it was cloudy and dark, then solar panel simply could not keep up. If I were you I'd either get a larger solar charging panel and system ... or hook up some trickle charger to the battery in adddition to the solar.
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