As the most high-end and advanced solar charge controller, it charges the battery with maximum power, the tracking efficiency of MPPT is 99%, and the whole system has high power generation efficiency by 97%. Features: This product provides short circuit protection, open circuit protection, reverse protection, overload protection. MPPT auto focus charging tracking, high charging efficiency, non-stop detection while charging, two-way focus tracking. MPPT solar regulator can detect the voltage and current of the solar panel in real time, and continuously track the maximum power, so that the system can always charge the battery with maximum power. The tracking efficiency of MPPT is 99%, and the power generation efficiency of the whole system is 97%. Additionally, the system has excellent battery management, including MPPT charging, constant medium voltage charging and constant voltage float charging. Features: Battery voltage: 12V/24V Auto Adapter Material: ROHS+ABS item color: blue+black Charging current: 30A, 40A, 50A, 60A, 100A (optional) USB output: 5V 2A object size: 170 * 95 * 40 mm / 6.69 * 3.74 * 1.57 in Weight Point: 260g / 9.17oz Package Size: 175*100*45mm/6.89*3.94*1.77 Package weight: 295g / 10.41oz Notes: 1. What is MPPT? Automatic load tracking aggregation. 2.Why only works with battery connected, put the battery solar panel charges, charging does not work? Why is it less than 100A? We are a current focus MPPT with two constantan wires designed to detect open no-load and maximum when over 1A.This technology is our patent practice, and has been recognized by the state, with a special patent certificate of invention .There is not this technology on the market. Compared with any other type buck-boost MPPT-inductive MPPT, the same solar charging state, our MPPT current focusing current tracking efficiency is higher, due to the power loss caused by booster and step step by step down. In fact, the ultra-low light charging efficiency is very low because the input power is very low. And our MPPT can also increase charging under relatively low lighting. Our MPPT is direct type. When the current is greater than 1A, it will not be tested. The channel will be billed directly. Only when it is charged to 95% battery, it will slow down and protect the battery. Package list: 1 * Solar Charge Controller