Solar Panel Rechargeable Battery Circuit

Schematic of a simple solar panel based circuit.

Solar panel rechargeable battery circuit.

The solar panel consists of solar cells each rated at 1 2 volts. 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. 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. Best 12v battery solar charger.

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. Between the two is a reverse blocking diode. A solar panel is on the left side of the schematic. 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.

In this circuit the solar panel charges up a 3 cell nimh battery 3 6 v. 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. It was also pretty affordable. The circuit harvests solar energy to charge a 6 volt 4 5 ah rechargeable battery for various applications.

For li ion battery i choose solar cell with 5v and 160 ma. Solar aa aaa rechargeable batteries charger for 1 2v aa aaa nimh nicd 9v battery with 2watt solar panel portable backup for 1 2v ni mh ni cd of solar powered lights and household battery 4 3 out of 5 stars 69. The circuit uses a 12 volt solar panel and a variable voltage regulator ic lm 317. 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.

A diode d1 protects the target device against a negative voltage in case the solar panel is installed in reverse. A 2v solar cell would be more appropriate for charging a single rechargeable battery. 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. The charger has voltage and current regulation and over voltage cut off facilities.

First we need to select a solar panel. So you can choose 500 mah solar cell or 1 ah solar cell. Best solar panel for charging 12 volt battery is perfect for portable off grid systems such as small cabins rvs sheds car and boats. This article describes the solar and battery backup circuit along with the recharging results so far.

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. 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.