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How's a solar panel going to work in the basement? 
Why not leave them aboard and use the solar panel there? If you do, it's always best to disconnect everything from the batts. Parasitic load can drain the battery, even when nothing is turned on.
A fully charged battery will not freeze and the cold weather slows any self discharge. Your solar should see to it that this is a non-issue anyway.
We leave all ours aboard and simply top up the charge about every 6 weeks.
Why not leave them aboard and use the solar panel there? If you do, it's always best to disconnect everything from the batts. Parasitic load can drain the battery, even when nothing is turned on.
A fully charged battery will not freeze and the cold weather slows any self discharge. Your solar should see to it that this is a non-issue anyway.
We leave all ours aboard and simply top up the charge about every 6 weeks.