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Old 12-26-12, 11:01 AM   #3
Daox
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I also did some quick searching for a DIY charge controller for nimh batteries and found this:

Float Charging NiMH Cells [227] | General Electronics | Electronics

It uses a 12V supply which is a bit high. I was thinking a 5-6V solar panel would be fine. I haven't looked at it quite enough to see if it will just work with a lower voltage panel. Much more searching to do.
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