Charging Nimh Batteries With Solar Panel

Here we put the solar power supply together.

Charging nimh batteries with solar panel.

The solar panel is rated at 1 w with a max load voltage of 6 4 v and the product page is here. When charging batteries with solar energy one should use a controller when the rated amperage of the solar panel is above 1 of the battery capacity. It is essentially the rule of the thumb for this procedure. 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 66.

This is pretty simple and you don t need much. I actually tested the panel myself and found that in the best case with 90 000 lux full sun the max voltage was 5 2 v corresponding to a max current of 157 ma. Once you ve attached the input wires to the charge connector you should have 2 loose wires each ending in an mc4 connector. The problem now is that the battery is quickly draining dropping to 8v after 2 hrs of supplying power to the 24w led lamp.

4 bay usb speedy charging smart battery charger fit for solar panel universal intelligent charger usb output port for 3 8v 3 7v 18650 26650 14500 16340 rcr123a lifeo4 1 2v ni mh ni cd aa aaa battery 4 4 out of 5 stars 259. The battery capacity is 2450 mah with a nominal 1 2 v per cell and the datasheet is here. The solar charger batteries had an average voltage of 1274mv and the duracell charger batteries had an average voltage of 1295mv. Assemble the solar cell.

There are two main types of controllers in the market which include on off and pulse width module pwm. Match up the male and female connectors with the opposite ones coming away from the solar panel and snap the mc4 connectors into place. Connect the wires from the controller to the solar panel. I used a 100w solar panel to charge the 40ah battery.

Measure power into nimh batteries connect solar panel to pack of 4 nimh aa2 and measure the voltage and current at each step where applicable. I haven t tested it too extensively and it s. The slightly lower voltage is not surprising because the solar charger was designed to end the charge cycle 30mv under max voltage. Do not use li ion batteries for this activity.

If you have a solar cell that doesn t need. I think the charging works fine because from 8v the circuit was able to charge the battery to 13v. You now have the complete design for your own solar charger.