ROBERT via EV wrote:
If someone wanted to test 300 - 400 NICAD or NIMH cells for capacity, how can
it be done efficiently? I do not want to take 6 months charging and
discharging one cell at a time. The purpose of the testing is to match cells
so as to build a large battery. Any tester I can buy to speed up the process?
I use my Battery Balancer for this <http://sunrise-ev.com/balancer.htm>.
You can program it to test up to 80 cells or batteries sequentially. It
can measure voltage and current, and control a charger and load bank.
For example, have the program:
- charge each cell to a defined "full" voltage and current
- then load it with a defined load
- measure the time to a defined "empty" voltage
- record the amphours
- recharge the cell back to "full"
- step to the next cell or battery
I'm using one now to test a set of CALB cells. I only bothered to
connect one relay board, so it tests a group of 8 cells. Then I offload
the data, and re-connect it to the next batch of 8 cells.
The Balancer ins't really a commercial "turn-key" product: It's just
something I built because I couldn't find anything affordable that did
what I want. But I do have bare and assembled boards, and sell them on a
one-off basis as needed.
--
"Verschlimmbessern" (German, verb) - To make something worse by
trying to improve it. (English translation: "Microsoft"?)
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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