Features: 4-Stage charging (Boost, ABS, Equalization, Float) and equipped with an industrial grade microprocessor to prolong battery life. Dual USB can can give your electronic product max 5V 2.5A. This solar controller backlight displays PV/battery/load charge and discharge parameters. Adjustable floating voltage/LVD/LVR/timer with power-off memory function as needed. This solar charge controller is suitable for lead acid batteries (for OPEN/AGM/GEL) with multiple load timers. The load should be DC. In order to protect the battery life, once the battery voltage drops below 8V, the solar controller will automatically turn off. Eight PWM charge controller protection: power-off memory / dual MOSFET reverse current / over heat / under-voltage discharge / short circuit / open-circuit / overload / over-charge protection. Safer for family, industry, business, etc. Specification: Condition: 100% Brand New Type: Z10 10A, Z20 20V, Z30 30V (optional) For Z10 10A solar controller, Max Voc: 24V (12V), 48V (24V); Max Power: 120W (12V), 240W (24V) For Z20 20A solar controller, Max Voc: 24V (12V), 48V (24V); Max Power: 240W (12V), 480W (24V) For Z30 30A solar controller, Max Voc: 24V (12V), 48V (24V); Max Power: 360W (12V), 720W (24V) Charge Current: 10A, 20A, 30A (optional) Discharge Current: 10A, 20A, 30A (optional) Battery Voltage: 12V/24V Auto Max Solar Panel Input: maximum 23V (12V), maximum 46V (24V) Equalization: 14.4V Float Charge Voltage: 13.7V (Default, Adjustable) Discharge Stop: 10.7V (Default, Adjustable) Discharge Re: 12.6V (Default, Adjustable) Charging Re: 13V Open Light Voltage: Solar Panel 8V USB Output: Dual USB Output 5V/2.5A (Maximum) Self-consumption: <10 mA Working temperature: -35℃~60℃ Size: Approx. 14.7*7.4*3.2 cm / 5.8*2.9*1.3 in Weight: Approx. 174g / 6.1 oz Package list: 1 * Solar Controller 1 * User Manual