Its cloudy out and i have a solar panel that has 3, .5 volt cells But how do i charge it without sun any other ways?
For the best answers, search on this site https://shorturl.im/awXJ0 The charge controller will protect the battery. You might want to think about getting a fuse.
Just to clarify the terminology here, solar panels can be used to charge batteries. The solar panel produces electricity from the sun but you do not charge the solar panel. So I'm assuming you have 3 .5 volt rechargeable batteries connected to a solar panel in some kind of integrated unit. The batteries are probably wired in series giving you a 4.5 volt output from the unit which you can use for powering LED's, portable radio etc. The solar panel may have about 2 solar cells wired in series, each producing up to 0.5V in good sunlight, but the amount of current they produce depends on their physical size, the sun's intensity, the load being supplied, and the type of solar cells. If it has the cheaper amorphous silicon solar cells, they will actually produce some useful output on cloudy days and charge your batteries slowly. However if they are more expensive crystalline cells they will only work with good sunlight, but then they will work very well and charge your batteries relatively quickly.. If your batteries are not charging enough on a cloudy day you could connect a mains-powered 4.5V charger to the output terminals of your unit. However you may need technical expertise to make this work because of the possible presence of internal blocking diodes. You also need to ensure the mains charger has appropriate power ratings and the connection to your unit is made safely, + to + and - to - . I hope this helps.
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