Victron Energy SmartSolar MPPT solar charge controller: A solar charger gathers energy from your solar panels, and stores it in your batteries. Using the latest, fastest technology, Victron Energy SmartSolar MPPT solar charge controller maximises this energy-harvest, driving it intelligently to achieve full charge in the shortest possible time. Victron Energy SmartSolar MPPT solar charge controller maintains battery health, extending its life. Victron Energy SmartSolar MPPT charge controller will even recharge a severely depleted battery. It can operate with a battery voltage as low as 0 Volts, provided the cells are not permanently sulphated or otherwise damaged.