Every solar power system needs an equally efficient regulator, like this SRNE VOLTX 12V 50A MPPT DC to DC Lithium Battery Charger. Designed based on an advanced multi-phase synchronous rectifier technology and MPPT control algorithm, it delivers rapid response speed, high reliability, and high industrialised standard. This solar charge controller stands out with an impressive conversion efficiency under any charging power and the ability to track the maximum power point of solar panels to obtain a sufficient amount of energy. It's perfect for charging an auxiliary battery in a dual battery system with an improved overall charging efficiency and light energy utilisation plus, can also be used in DC-DC control circuits for voltage & current regulation. On top of these, you also win in versatility here as it has 4 charging phases suitable for charging lead-acid batteries and 3 generator charging modes for recharging through a vehicle generator. Easy to monitor and equipped with built-in protective features, this is a must-have for anyone going solar!