Solar Panel Rechargeable Battery Circuit

The circuit uses a 12 volt solar panel and a variable voltage regulator ic lm 317.

Solar panel rechargeable battery circuit.

For choosing solar cell you must choose. The solar panel consists of solar cells each rated at 1 2 volts. The circuit harvests solar energy to charge a 6 volt 4 5 ah rechargeable battery for various applications. A diode d1 protects the target device against a negative voltage in case the solar panel is installed in reverse.

A solar panel is on the left side of the schematic. Best 12v battery solar charger panel typically put out about 13 6v to 17 0 volts use to charge 12v battery or to run any 12v devices. Best solar panel for charging 12 volt battery is perfect for portable off grid systems such as small cabins rvs sheds car and boats. Between the two is a reverse blocking diode.

Using converter you can charge mobile also. The charger has voltage and current regulation and over voltage cut off facilities. With the standard 0 7v drop of a diode you ll have 1 3v of charge voltage which won t be high enough for a maximum charge but a schottky rectifier diode selected for 0 5v forward voltage drop would get you 1 5v charging. So you can choose 500 mah solar cell or 1 ah solar cell.

I selected a 5 w panel it has an open circuit voltage voc of 22 v and a short circuit current isc of 300 ma. For li ion battery i choose solar cell with 5v and 160 ma. An 18v 1 amp solar panel would be ok if only battery is charged if leds are also simultaneously used then you would require a 3 amp solar panel. A 2v solar cell would be more appropriate for charging a single rechargeable battery.

In this circuit the solar panel charges up a 3 cell nimh battery 3 6 v. In this next circuit we use the solar panel to charge up a nimh rechargeable battery and also led off of the power which will stay on when it gets dark out. The high voltage of this panel allows it to be used to charge 12 v car batteries something i thought desirable. First we need to select a solar panel.

For a 12v 70ah battery use a 18 v 10amp solar panel 18v is the peak rating of the panel and 10amp is the short circuit current of the panel. It was also pretty affordable. Voltage of solar cell 1 5 x voltage of battery so 3 7v to 4 2 v of li ion is equivalent of 5 55 v to 6 3 v of solar cell. The backup time will entirely depend on the battery ah and the led current led current should be approx 1 10th of battery ah for 9hrs operation.

Dev solar panel current is not rated with ah its rated with amps a controller can be avoided by selecting a correctly rated solar panel for the battery. Schematic of a simple solar panel based circuit.