1、Innovative MPPT Design: The MPPT solar charge controller is designed with die cast aluminum to ensure excellent heat dissipation and energy maximum power point tracking technology. Its tracking efficiency is up to 99% and peak conversion efficiency is up to 98%. Even in cloudy environments, it can effectively track the maximum power point of solar panels and provide the best charging solution. 2、12V 24V Automatic Detection: MPPT solar charge controller has the function of automatically detecting 12V or 24V system voltage. Multiple LED indicators can display information related to solar charging and battery operation, which is convenient for users to understand the system status. 3、Full System Protection: MPPT solar charge controller has self diagnostic function to evaluate and protect your system. It prevents reverse polarity, battery overcharge, battery overdischarge, overload, short circuit and reverse current, providing full system protection and extending battery life. 4、4 Stage Safe Charging: MPPT solar charge controller supports 4 stage charging modes (bulk, absorption, float and equalization) for acid batteries and 2 stage charging modes (bulk and absorption) for lithium batteries as well as lithium reactivation. 5、Multiple Load Control: The MPPT solar charge controller can connect the DC generator directly to optional load terminals and can be load controlled by monitoring consumption or setting timers through the controller. Item Type: MPPT Solar Charge Controller Material: Aluminum Weight: Approx. 915g / 32.3oz Power: 12V: 400W 24V: 800W Product Size: Approx. 150x105.6x67.5mm / 5.9x4.2x2.7in Installation Size: Approx. 139x60mm / 5.5x2.4in 1 x MPPT Solar Charge Controller 1 x Instruction Manual