I'm trying to build a very small LED light that runs of solar power. The goal is to have it charging most of the day and maybe get about 15 minutes of "led power" per day (comparable to these solar garden lights, with the exception that they don't need to run al night). I'm looking to power a single led at preferably high brightness (say 2V, 20mA).
Since I'm looking for a small form factor I ordered these, 1v 80mA, solar cells (25mm x 30mm). Preferably I would stick to one cell to keep it small. Now I'm not really sure if, and how, I would be able to store the energy collected by the solar cell and use it to power the LED at a specific moments. Some questions I have:
- Is it possible to use this a 1v solar cell to charge a battery? Maybe by boosting the voltage?
- What kind of energy storage would be good: Lipo, NiMH, capacitor?
- Are there circuit examples I can follow
- Can these circuits build in a cheap way?