It sounds like an inductor in that controller doesn't like to work without a load. Better controllers sense when the battery is disconnected and shut down. If you don't want to mess with the wires, tie a tarp over the solar panel. If you're keeping the battery outside or in a garage that gets to freezing temperature, it needs to be fully charged and on a battery maintainer. Charged batteries have a much lower freezing point than uncharged ones. And lead acid batteries have a longer lifetime when kept charged in any case.
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