Feature 1This product provides short-circuit conservation,open-circuit conservation, reverse conservation, overload conservation. 2Automatic focusing MPPT tracking charging, high charging efficiency, non-stop detection during charging, bidirectional focusing tracking. 3MPPT solar controller can detect the voltage and current of the solar panel in real time, and constantly track the maximum power, so that the system can always charge the battery with the maximum power. As the most high-end and advanced solar charge controller, it charges the battery with the max power, MPPT tracking efficiency is 99 percent , and the whole system has a high power generation efficiency of 97 percent . Features: This product provides short-circuit conservation,open-circuit conservation, reverse conservation, overload conservation. Automatic focusing MPPT tracking charging, high charging efficiency, non-stop detection during charging, bidirectional focusing tracking. MPPT solar controller can detect the voltage and current of the solar panel in real time, and constantly track the maximum power, so that the system can always charge the battery with the maximum power. The tracking efficiency of MPPT is 99 percent , and the power generation efficiency of the whole system is up to 97 percent . Moreover, the system has excellent battery management, including MPPT charging, constant voltage average charging and constant voltage float charging. Specifications: Battery voltage: 12V or 24V Auto Adapt Material: ROHSandABS Item color: blueandblack Charge current: 30A, 40A, 50A, 60A, 100A (optional) USB output: 5V 2A Item size: 170 95 40 mm or 6.69 3.74 1.57 in Item weight: 260 g or 9.17 ounce Package size: 175 100 45 mm or 6.89 3.94 1.77 in Package weight: 295 g or 10.41 ounce Notes: 1. What is MPPT Automatic load tracking aggregation. 2. Why