I am trying to design a project for homeless people.  I need to attach an inexpensive solar panel to a bag.  The panel would somehow connect to a (cheap) battery, storing energy to power a waterproof LED for use in the dark.  Is this possible?  I have seen waterproof LEDs here.  But how about the solar power to battery to LED part?  I am electrically-challenged, so make this easy, okay?  Thanks a million.

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go to the 99 cent store, then go to the eletrical section and look for solar path way light but not all of the stores have them
janw7 years ago
It is possible for sure. beacause they already exist ;) (see photo). but if you want to make them yourself then buy a good solarpanel so that your batteries are charged quickly and 4white leds (each 0.075W) they should last for hours in 3 AA rechargable batteries.
If you take apart a solar garden light and reconfigure the bits, you'll have everything you need, already connected. If you replace the photocell with a regular old on/off switch, you can even turn it on and off to conserve battery power.
That's a good start, but the light from a solar garden light is barely useful.

Maybe a solar powered spotlight?
Yeah, the spotlight would probably be better in general, but then I'd want to add an option to to run it at half-power (or fewer LEDs, more likely) to conserve battery power, or just in case the full-power spot is too bright.