Protects batteries from overcharging and discharging, plus regulates the voltage when using 12V solar panels to charge batteries. For use with up to 105 Watts of solar power (one unit is good for up to 7 of Item# 339972). Must be used with all solar panels 10 Watts and higher. Weatherproof, so it can be used with all types of models and solar chargers, even wind generators.
