Mount the solar battery system in the cool and dry cellar or outdoor – in a well shaded place. And: wall-mounted systems are better protected against water damage than those on the floor.
You can bury it in the ground
It is also possible to bury the batteries into the ground, enclosed in prefabricated concrete tanks, because they are below the frost line, are at an almost even temperature throughout the year. A good place to put them is along the eastern facade of the house. That way, the battery is slightly warmed by the morning sun when charging begins. It could also be mounted to the northern wall of the house. (HS)
Look at this, too:
Storage advice: Protect the battery against deep discharge and overcharging
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