>I am thinking of making a small battery pack using D cell nimh batteries.
>Has anyone done this and what kind of a charger did they use or make?
>I would like to use 24 Volts or 12 Volts.
>
>Thanks for any info
In addition to regulated supplies of about 13.9-14.0 V which can just
be left on as a float charge, I've used a cheap Canadian Tire charger
that had an adjustment pot inside. I set it to turn off at about 14.2
volts instead of 14.4. By the time they hit 14.4, if they ever do,
they'll be overcharged and hot.
You could also put in a diode (.6V) or a Schottky diode (.3-.5V) to
drop the voltage a little, and a resistor (maybe 1000 ohms) across it
so the charger senses the battery. Then if the charger's putting out
14.4V, the battery is only getting maybe 14.1V. This sort of has to
be worked out for individual chargers.
It's a bit ironic, since the NiMH cells will sit at about 13.5V or
higher after charge, but lead-acid will soon drop under 13.
I'm still waiting for some PLA plastic filament to 3D print 12V (10
NiMH D cell) battery cases. The ABS is a higher temperature and it
warps too much during printing with large items - I gave up.
Craig
http://www.TurquoiseEnergy.com/
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