It sounds like you may not have a diode installed that prevents backflow when you have little or no sunlight. In other words, without a properly installed diode, power flows from the battery to the solar panel at night, thereby draining your battery.
Do an internet post on "solar panel diode."
Hope this helps.
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2015 Fuzion 331
2013 Ford F350 6.7L
2012 Harley-Davidson Heritage Softail Classic 103CI
2007 Harley-Davidson Sportster 1200 Low (Wife's)
2016 Harley-Davidson Freewheeler (Wife's)
2015 Polaris Ranger 570 EPS Bronze Mist
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