Solar batteries are generally kept warm in the winter by storing them indoors, on a shelf or countertop. This allows them to maintain an average temperature of approximately 70 degrees Fahrenheit throughout the day. If solar batteries are stored outside, they should be protected from freezing temperatures. To protect solar batteries from freezing, place them on a heat mat or store near appliances that produce heat inside your home.

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If you choose to leave solar batteries outside during winter months, make sure they are placed where they will be exposed to sunlight for most of the day. If necessary, move the batteries several times per day so that they receive direct sunlight for equal lengths of time each day. Some people also cover their batteries with blankets once hours of direct sunlight have passed. If you choose to store solar batteries outside during the winter, open the battery case daily to check for condensation. Discard any water that has built up inside.

You can also minimize the possibility of freezing by using freeze-resistant batteries. The Absorbed Glass Mat (AGM) style is designed with tiny glass mats between the lead plates and acid to absorb excess liquid, which prevents freezing during periods of low temperatures or high humidity. Float batteries are another option because they do not lose electrolyte when frozen, but it is important to monitor their levels regularly to prevent damage from overfilling.

If your solar battery becomes frozen, warm it slowly in a well-ventilated area until its temperature rises above 32 degrees Fahrenheit (0 degrees Celsius). Do not attempt to thaw a frozen battery with an open flame. Thawed batteries can be recharged and reused, but they should be replaced after three or four freezing incidents because the plates will begin to corrode from over exposure to ice crystals.