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$3 Solar-Powered Cellphone Charger

Build a Solar Powered Cell Phone Charger from a few dollar store items and a few parts.

$3 Solar-Powered Cellphone Charger

Hack two simple pieces of electronics for a new purpose. This is not for those who use their phones a lot, although it could have other purposes, like being an MP3 player charger or anything that charges from a USB connection.

Steps

Step #1:

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$3 Solar-Powered Cellphone Charger

Start with a dollar-store solar garden light.

Step #2:

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$3 Solar-Powered Cellphone Charger

Twist the housing off to expose the LED and diffuser.

Step #3:

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$3 Solar-Powered Cellphone Charger

Twist off the diffuser to expose the LED. Inside the battery compartment on this one you'll see a AAA NiMH 300Ma. Some models have a large capacitor instead. Put the battery cover back on.

Step #4:

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$3 Solar-Powered Cellphone Charger

Sometimes they twist apart, or you may have to remove a few small screws to get inside. You can see the 2 wires leading from the solar cell on top going to the board. I'll snip the LED (checking polarity with a charged battery and a multimeter) and use those leads for later hook up.

Step #5:

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$3 Solar-Powered Cellphone Charger

Again, at the dollar store I found a AA battery-powered emergency cellphone charger with a variety of tips including the mini USB used by my Crackberry. Cracked it open to remove a small PC board that basically transforms 1.5V into something over 5V, enough to give a little charge to my phone. Sorry 'bout the fuzzy shot, I was drunk when I took it.

Step #6:

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$3 Solar-Powered Cellphone Charger

I used a little piece of double-sided tape (hot glue gun would work just as well) to stick the charger PC board into the solar light housing and soldered the 2 leads from the light to the corresponding leads on the charger.

Step #7:

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$3 Solar-Powered Cellphone Charger

Put the housing back together and if you can, coil up the excess wire to the plug. I added an old rubber foot with self adhesive tape I found in my parts bin. It keeps it from sliding around on my dashboard

Step #8:

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$3 Solar-Powered Cellphone Charger

Voila! It sits on my dash, charges the AAA battery during the day and when it gets dark, it automatically sends power to the charger and then to my phone. I keep my phone in the glovebox for emergencies and this way it's always charged. And all for under 3 smackers.


Comments

  1. Randy Jacks says:

    I’d like to see how to hook up a bunch of these to make a 12 volt charger/float charger to keep my boat & jet ski batteries charged…

    1. Steven Clark says:

      Haber freight tools already has one that’s solar to 12 volt. I have 3 and left them one all the time.

  2. Asha D says:

    really very good concept and save the power …….. I am proud of because I am a mechanical engineering

  3. Will says:

    We have small panels with the controller built in, just attach to battery and done. B.C.Renewable

  4. […] This project by Kevin Wrycraft was posted in Make: Projects on the MAKE Magazine site. MAKERSHiP participants should take Soldering and Electronics Basics at TechShop to get the skills to complete this project. Read the directions and see photos of the project steps at Make: Projects $3 Solar-Powered Cellphone Charger. […]

  5. shannon says:

    do you have a video on this ?

  6. […] DIY $3 Solar Powered Small Electronic USB Charger […]

  7. smith yuesir says:

    This idea inspires me a lot, I’ve searched on the web but only find one alike on tinydeal http://www.tinydeal.com/solar-powered-cell-phone-charger-w-3-led-assorted-color-p-61935.html