This solar car battery charger is designed to prevent deep cycle and larger 12V/24V batteries from self-draining and to reduce the extra cost for battery replacement. It uses sunlight to trickle charge a car battery when it has not been running for some extended time period.
Figure out your needs because car battery chargers come in all shapes and sizes. Some are small, easily moveable, shelf mounted units for occasional use. Others are large units that have wheels and roll on the floor. Small car battery chargers are perfect for people that only want to charge a dead battery once and a while, or jumpstart an occasional car. Larger car battery chargers are for people who frequently tinker with cars, large shops and dealerships, or people that just want the extra power.
The charging protocol depends on the size and type of the battery being charged. Some battery types have high tolerance for overcharging and can be recharged by connection to a constant voltage source or a constant current source; simple chargers of this type require manual disconnection at the end of the charge cycle, or may have a timer to cut off charging current at a fixed time. Other battery types cannot withstand long high-rate over-charging; the charger may have temperature or voltage sensing circuits and a microprocessor controller to adjust the charging current, and cut off at the end of charge. A trickle charger provides a relatively small amount of current, only enough to counteract self-discharge of a battery that is idle for a long time. Slow battery chargers may take several hours to complete a charge; high-rate chargers may restore most capacity within minutes or less than an hour, but generally require monitoring of the battery to protect it from overcharge. Electric vehicles need high-rate chargers for public access; installation of such chargers and the distribution support for them is an issue in the proposed adoption of electric cars.
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