Re: Another Novice Q. - recharging - Volts and Amps


"Kris Krieger" <me@xxxxxxxxxx> wrote in message
news:HN6dnUa5Bpt2esLVnZ2dnUVZ_h3inZ2d@xxxxxxxxxxxxxxxx
Apologies in advance if this is a dopey question, but, when it comes to
recharging batteries, and using a solar cell to do that, what I've been
assuming, based on th info that peopl ehere have kindly provided, and also
that I've foind on-line, is that teh mA output of the solar cells should
not exceed 2/10ths to maybe 3/10ths of the battery's mA rating, and teh
voltage produced by the solar cells should be as close as possible to the
total voltage of the battery or batteries. But I wanted to check whether
that assumption is correct, becasue I think I'm getting closeto getting
some parts and trying a couple of assemblies.

Thanks In Advance!

- Kris

Hi Kris,
Different batteries need different charging conditions.
Look at the specs for your batteries.
The charging requirements will be discussed.
Some batteries may say: Charge at .1c for 10 Hrs.
This means to charge them at one tenth the AH rating for 10 Hours.
The VPC (volts per cell ) will also be specified.
For example: NiCads are about 1.2 VPC and can charge at about 1.3-1.5 VPC
(follow manufacturers specs) at .1 -.3 c. (again, follow specs.).
So if you have a 12 volts NiCad pack that would be a 10 cell NiCad battery.
If you are using lead acid cells, the numbers are different.
Keep in mind that photo cell manufactures inflate their specs by using
bright sunlight averages.

Tom


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