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I want to make a solar battery charger, may you help me?

How do I prevent the battery from overcharging? Is overcharging dangerous? May it cause the explosion of the battery? Would a 3V solar cell charge a 3,7V battery? And two 3V cells?

it depends on what type of battery you are using, you need to give us more details before we can answer it accurately!!! if it is a nimh ( nickel metal hydrate) battery you dont really need a charge circuit just leave it in and test it with a multimeter until it is giving its voltage!!! if it lithium polymer or lithium ion do NOT charge it, if you charge a lipo it will actullay explode in a real fireball about 40cm high!!!! you also have a bit of leeway with nicd ( nickel cadium) batteries so the same applies as with the nimhs!!! dont forget to add a sckotty diode between the cell and the battery because if you dont the battery will discharge into the cell at night undoing all the days charging!!! hope this helped!!! cm
lemonie8 years ago
Have you seen these: https://www.instructables.com/tag/?sort=none&limit%3Atype%3Aid=on&q=solar+battery+charger
You need more than 3.7V to charge a 3.7V battery, 2*3V might normally be considered too much, but if your solar cells don't produce much current you should be OK.

L