Description:   20A 12V\/24V PWM Solar Charge Regulator Solar Panel Battery Controller 240W\/480W   Features:    Build-in industrial micro controller. One-key setting、 digital display. Fully 4-stage PWM Charge management. Build-in short-circuit protection、 open-circuit protection、 reverse protection、 over-load protection. Automatically manage the working of solar panel and battery in solar system.  Under-voltage and over-charging protection. Protection from lightning strike. Prolong the battery life cycle and keep the load work well. This controller can charge and discharge at the same time. It has perfect SOC function、 control charge current、 and supply power to the loads. The controller will automatically compensate the temperature of the charging voltage according to the changes of ambient temperature.   Specification:   Battery Voltage: 12V\/24V auto adapt Current: 20A Max Solar input: 41V Charge drop: !#!amp!*!lt;0.2v Discharge drop: !#!amp!*!lt;0.25v Equalization: 14.6v\/12v system、 29v\/24v system Bulk: 14.4v\/12v system、 28.8v\/24v system Acceptance: 14.2v PWM\/12v system、 28.4v PWM\/24v system Float: 13.8v\/12v system、 27.6v\/24v system Charge reconnect: 13.8v\/12v system、 27.6v\/24v system Discharge stop: 10.8v\/12v system、 21.6v\/24v system Discharge reconnect: 12.6v\/12v system、 25.2v\/24v system Self-consume: !#!amp!*!lt;10mA Voltage of open light: Solar panel 8v(Light on delay 12v system)、 16v\/24v system Voltage of close light: Solar panel 8v(Light off delay 12v system)、 16v\/24v system Temprature compensation: N\/C Operating temperature: -35\u2103 -- +60\u2103 Size\/Weight: 133*70x35mm\/150g                Package includes:    1 x 20A Solar Charge Contorller 1 x User Manual   Details pictures: