20A Solar Charge Controller Solar Panel Battery Regulator Safe Protection 12V/24V Auto Switch BSV20A (20 Amp) Automatically manage the working of solar panel and battery in solar system. Overloading & short-circuit protection. Reverse diacharging & reverse-polarity protection. Under-voltage and over-charging protection. Protection from lightning strike. Prolong the battery life cycle and keep the load work well. Easy to set up and operate. Suitable for small solar energy system.