I have a solar panel that puts out 100v, .5 amps in full sun. Before I thought it would charge a 12v battery without a solar charger but then I talked to someone and they said that it was wasting a lot of power and could potentially hurt the battery. A second part to this question is what happens if I put it on a 72v battery without a controller. Thanks!
Hmm. The answers are fairly interesting. The voltage of the solar panel drops to the voltage of the battery when I connect it because of the very little amps the solar panel has. Thanks for the answers!
The solar panel is capable of 1/2 Amp output. If you hook it to a 12V battery directly and the battery is discharged it will want more than 1/2 Amp and pull the voltage down until the battery is charged to a certain level. Eventually the battery will try to charge up to 100V which will definitely damage the battery. If you use a regulator circuit running off the solar panel that outputs 12V then you will have a constant voltage circuit which will still be limited to 1/2A or whatever the regulator is capable of outputting. Of course you can't just go out and connect 100V to any voltage regulator it has to be capable of running from 100V and dropping the voltage to 12V like the original charger that comes with the battery. The same explanation applies to a 72V battery. You have to limit the output voltage to 72V or risk overcharging the battery.
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