Able to maintain up to four 12 V batteries connected in parallel, SP-5 OTR Solar Charger Maintainer harnesses solar power to reverse normal loss of battery power, sulfation buildup, and parasitic draw on erratically used vehicles. This 5 W, commercially rated solar panel, by temporarily attaching to vehicle's exterior hood via 4 suction cups and plugging directly into OBD connector for power, can be installed and removed within seconds.