Upgrade your dual battery system with the SRNE VoltX 12V 50A MPPT DC-to-DC Lithium Battery Charger. This handy device allows you to safely charge via your alternator and solar panels. Equipped with an MPPT function, this ensures optimal charging via solar energy by regulating the power generated by your panels which will flow into your battery. This lithium battery charger also protects against overheating, over-current, short circuit, and open circuit for reliable and maintenance-free operation - a real must-have for any dual battery system.