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How to Build a Battery Isolator Automotive battery charging circuits are designed to recharge and maintain a single battery. However, automobiles with custom audio systems, electric winches or other high-drain devices may require a second battery to power these devices. One of the problems with connecting two batteries directly to an automotive charging system is that if one battery is weaker (provides less electrical current at the same voltage) than the other, the charging system may be taxed beyond its design parameters for providing power. This also has the undesirable consequence of draining the “good” battery to equalize the charge in both batteries. One way to charge both batteries without overtaxing the charging system is by using a battery isolator. A battery isolator is constructed using two diodes, which act as one-way electrical check valves for the charging system. Things You'll Need Solder-type lug terminals (3) High-current diodes (two; RF1501TF3S or ...

How to Charge a Car Battery Through a Cigarette Lighter An automotive electrical system normally has one or more power accessory points. These accessory points are often cigarette lighter outlets. However, most vehicles manufactured since the 1990s contain dedicated power accessory outlets. Many automobiles have their cigarette lighter outlets wired so that the outlets only work when the automobiles are running. However, power accessory outlets are usually hardwired to the battery, and are always active. A power accessory outlet may also be used as a means to trickle charge an automobile battery. Some accessories, such as solar battery chargers, are designed to take advantage of the bidirectional nature of a hardwired power accessory outlet. Things You'll Need Automobile with hardwired power accessory outlet Solar battery charger with automotive cigarette lighter plug Instructions Place the solar battery charger, shiny-side up, on the automobile's dashboard....