Compact solar charger / flashlight

by dkennell, published

Compact solar charger / flashlight by dkennell Jan 1, 2013

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This compact solar phone charger has a one-piece case, a 2 watt solar module, and a 2700 mAh lithium ion battery. The 3 bright white LEDs give a nice focused beam for a flashlight.


Print case and assemble electronics. Use the 10 ohm resistor for the 3 bright white LEDs in parallel and the 1.2 kohm resistor for the 3 mm indicator lights.

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I happen to have almost all of the parts for this, but would like to remove the flashlight portion, and make the batteries removable. Are you willing to share whatever cad file you have for the source for this? Thanks!

I have uploaded the Inventor file, as well as STEP and IGES formats. Hopefully one of those will work for you.

Ouch.. thats an expensive bom.

Good point,

So I did the math and at $95 worth of parts, and gathering 24 watt/hours per day (assuming 12 hours of direct sunlight and 100% charge efficiency which is not possible), it would take you ~88 years to collect enough energy for the device to pay for itself. This also assumes you pay about $0.12/KW for mains power and all the components last that long.

This was originally concieved as the larger version, Solar Charger /
Emergency Light , after seeing hurricane Sandy victums trying to charge cell phones from generators and live by candle light. My daughter and her family were in the path of Sandy, so I made this for her for Christmas. Letting the charger in a window, even with a poor solar exposure, will keep the battery topped up and ready to go. A text or phone call in a disaster seems well worth the price.

I think the cost could be reduced if the individual components were sourced and the circuit diagrammed out.

I agree. The Eagle files are available at http://adafruit.comadafruit.com. Some of the main components are only available in SMT, so this makes it a bit more challenging.

Is there a kit for this? List of parts?

Check out the BOM (bill of materials) pdf. There is a complete list of parts.