WHY DO WE NEED A SOLAR CHARGER? Automotive batteries naturally discharge when it's not in use, and those more than 30 electrical modules as computer, alarm system, immobilizer and lock monitoring, all consume electricity from the battery. These issues make it hard to boot. Solar panel charger solve the startup problem by keeping the battery active. [ Prolong the battery longevity ] A 12V battery that is not correctly maintained above 12.4V will suffer from sulphation, which the main cause of battery died. That's why the vehicle battery easily goes to dead when vehicles are left sitting for too long. Solar panel charger prolong the longevity with continuous charging to the battery. .