I built this flashlight so i would have one that used sunlight and didn't require any batteries. When fully charged it can stay lit in approx 30 minutes.

Step 1: What You Will Need

Step 2: The Circuit

Step 3: Putting on the Solar Panel

Step 4: Add the Capacitors

Step 5: Mounting the Switch

Step 6: Mounting the LED's

Step 7: Connecting the LED's



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    9 Discussions


    This project is awesome and just what I was looking for. I am traveling to Honduras in a few weeks with a group of engineering students and we are attempting to teach children at an orphanage about solar energy. On top of that, we are wanting to give these children a sustainable technology they can use in their everyday life - hence the flashlight. Due to the frequent and unpredictable power outages the orphanage faces, I was wondering if there was a way to make this particular design last for a few hours rather than 30 minuets. Would replacing the capacitors with rechargeable batteries help? I would appreciate any suggestions you have.


    normally the cap's limit voltage will be twice.Ex your solar is 5.5 then for safety you should use 12V or 16V. Caps are as danger as a lipo battery.IT EXPLOSES!!

    If the capacitance of the super capacitors were higher, would the flashlight stay lit longer?

    Personally I'd love to see some more textual explanation of your steps, but all in all you nailed it! The project looks really professional and sleek!

    Very nice instructable. I like your use of supercapacitors!

    1 reply