I have quite a few little solar cells from different devices. I want to use them as a power source. Putting them in series would produce too high a voltage for my purpose. Could I put them in parallel, even though they are different voltages?
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not really. The lower voltage ones would take the current from the higher voltage ones.
If the voltage is high enough, you can use series diodes to prevent that happening.
Use series parallel combinations, with several series strings in parallel protected by diodes.
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