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Battery

 
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rnjcurtis(at)charter.net
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PostPosted: Wed Nov 08, 2017 9:40 am    Post subject: Battery Reply with quote

Bob,

I built the poor man's battery capacity tester and find that in checking it out it only takes the battery down to 11.7 volts and there seems to be a reasonable amount of power left in the battery. Is this the expected operation of this tester or do I have a problem with it?
Roger


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nuckolls.bob(at)aeroelect
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PostPosted: Wed Nov 08, 2017 10:26 am    Post subject: Battery Reply with quote

At 11:40 AM 11/8/2017, you wrote:
Quote:
Bob,

I built the poor man's battery capacity tester and find that in checking it out it only takes the battery down to 11.7 volts and there seems to be a reasonable amount of power left in the battery. Is this the expected operation of this tester or do I have a problem with it?

Roger


Probably not. As you've discovered, this isn't a tightly
'calibrated' device. You CAN lower the switch point
by making small adjustment of the resistor in series
with the zener. Lowering the resistance will lower the
switch point.

The primary value of what you have now is a REPEATABLE
benchmark for tracking battery condition over its service
life. Irrespective of the exact trip point, you can
confidently assert that a battery that ran 2.7 hours
when new and runs only 2.0 hours now has lost 26% of
its capacity at the same load.



Bob . . .


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