Modern vehicles have more than 30 body control modules, alarm systems, anti-theft, and lock monitoring. All of these devices consume battery power. The power consumption of these modules is very small, but if the vehicle is not used or rarely used for a week or two, the battery will discharge until it runs out. If the battery runs out due to natural power consumption, it may never be able to restore all power. But whenever the sun shines, the DeYangpu portable solar panel battery Maintainer will generate an electric current to protect your battery from being drained.