3S 3A 12V MPPT Solar PV Charger Controller Module CN3767/CN3722 with LED Indicator for 18V Solar Panel System 1. High-end technology MPPT solar maximum power tracking charging management chip, with trickle, constant current, constant voltage charging management_x000D_ 2. high-frequency low-conductivity internal resistance dual MOS tubes, high-current diodes, high-efficiency flat high-power inductors, alloy current detection resistors_x000D_ 3. The large-size aluminum heat sink at the bottom ensures long-term stable operation under high current_x000D_ 4. High-speed and efficient charging 5. Dual status indicator lights, the red light flashes when the battery is not connected, the green light is always on, the red light is on when charging, it stops when it is fully , and the green light is on at the same time Input voltage: powered by a nominal 18V solar panel (recommended)_x000D_ Overcharge and float charge voltages are 14.8V and 13.55V, respectively_x000D_ Output current: maximum constant current 3A_x000D_ Working temperature: -40~+85_x000D_ with overvoltage protection_x000D_ With MPPT function_x000D_ Colour:red_x000D_ Material:plastic_x000D_ Size: 4.923 x 3.437cm Package Contents:_x000D_ 1 x solar controller module Only the above package content, other products are not included._x000D_ Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_