Introduction: 3.5V Solar Panel AA Battery Charger

Picture of 3.5V Solar Panel AA Battery Charger

Hi everyone,
I'm Manuel and this is my first instructable so if you have any questions, don't hesitate to post a comment.
Today I'm going to show how to make a simple aa battery charger using the light of the sun.

Step 1: Materials:

Picture of Materials:

For this project you need:

- A solar garden light (mine was bought in a dollar store)
- A diode with low voltage drop (I suggest 1n914)
- AA battery holder
- Soldering iron
- An obviously rechargeable batteries

Step 2: Solar Panel

Picture of Solar Panel

Now remove the solar unit from the steak and open the unit by unscrewing the three screws at the bottom.
Inside there is a small circuit (with a transistor,a resistor and a led) and an AAA ni-mh battery.
The panel is at the top and it's easy to remove.

Step 3: Connections

Picture of Connections

At this point, using a soldering iron, solder the two wires of the panel to the positive and negative wires of the battery case.
WARNING: respect the polarity of the 2 wires otherwise battery will heat up and they can explode.

Step 4: Conclusion:

Picture of Conclusion:

It takes a lot to charge up the batteries but it's an interesting project about "green energy".
I hope you enjoy this instructable and soon I'll post another project regarding solar energy... so stay connected!


setite (author)2017-06-21

This is what I have been looking for. I plan to get a weather station soon that takes a few AA batteries. I'd like to run the wires from a solar cell(s) to trickle charge the device so that I can either extend the run time, perhaps indefinitely. Is there anything different I'd have to do?

DIY Hacks and How Tos (author)2017-05-20

You can also wire multiple solar cells together to speed up the rate of charging.

Yes, of course. This is a basic set up and so it can be improved in several ways.
Thanks for your observation!

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