In my (less than ideal) scenario, I would still get 2.5 amps from only one 100 watt panel... 30 watts @ 12 volts. You stated you were only getting .3 amps?
I modified my RV cover (a hole) to expose one of my solar panels for winter storage. Regardless of exact numbers, I haven't had to deal with a dead battery for over two years.
Maybe a battery maintainer would work better for you.
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