3.5V Solar Panel AA Battery Charger

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Introduction: 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:

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

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

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:

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!

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    6 Comments

    0
    Dinkelborg
    Dinkelborg

    4 months ago

    Sorry, but this seems wrong - don't you need some sort of load balancing? What happens when the batteries are fully charged but the solar panel generates more current - there is no overcharge protection so the batteries might burst and cause a fire. Or am I totally wrong here?
    Also how does this cuircut deal with the different levels of voltage generated by the cells? Sometimes you might get almost 5v while other times about 2v

    0
    james.comer
    james.comer

    1 year ago

    Where does the diode come in? The only mention is that you need one.

    0
    Solar panels
    Solar panels

    3 years ago


    Good INFORMATION. Really helpful
    For more solar panel related information Once VISIT THIS
    solar panel

    0
    setite
    setite

    4 years ago

    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?

    0
    DIY Hacks and How Tos

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

    0
    ManuLab DIY
    ManuLab DIY

    Reply 4 years ago

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