Not sure why no one has talked about a solar panel to keep batteries topped up! Or did I miss something? The price just keeps getting lower and they work well. Mine are always up and the boat is covered in canvas plus snow. A small inexpensive panel will deliver 2 amps or less in the daylight and won’t even require a controller at that charge rate. If your batteries are being discharged or they aren’t strong enough, they can freeze. Check specific gravity and electrolyte level yes! Len
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