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The batteries I'm dealing with are aircraft batteries, 12 v, 24 ah, recombinant gas, made by Concorde. The FAA regulations require that batteries be capacity tested during an aircraft's annual inspection. I am interested in checking my battery between those annual inspections, to make sure it is...
wizpic,
Thanks. You are obviously much more well informed on this subject that I am. I was pretty amazed when I learned that the battery manufacturer dictates a one hour time to test its 24 ah battery, with a "pass rate" of 85%. I did not plan on being absolutely accurate with the testing, but...
Tony,
Unless I am misunderstanding, this device will do exactly what I am trying to build. I could program it to kick in at 10.25 volts to operate another two pole relay, one feeding a battery powered clock and the other connecting my 6 amp load to the battery. I assume it will not restart it...
Tony,
Thanks, so yes, I will still need the circuit I am working on, to drop the power to the unit, so I could then read the accumulated amp hours.
Naturally, my ultimate goal is to determine the number of amp hours consumed until the battery drops out of the "functional" range. Generally...
Thanks Tony. Do they keep a record of the time alongside the voltage, etc. That is, could I load the battery, and just make sure I didn't pull it down too low; then go back and see at what amp hours it reached my cut off voltage?
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Srizbf,
The transistor in the original...
I am trying to design a relatively simple capacity tester for a 12v battery. I want to put the battery under a load and measure the time it takes to drop the voltage to 10-10.5 v. I thought of the circuit in the first attachment, but can't work out the zener voltage or resistor values to get it...
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