Ammeter/ Volt meter adjustment
I installed a cheap meter to read volts and amps sometime ago along with a shunt. There are two pots on the meter one for volts and one for amps. The volts I set with my volt meter but the amps I can ...
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My cheapo combo volt/Ammeter was the 100 amp version and it was for a project no longer in my possession. It was Not able to read anything below 0.78 amps no matter how much I tried to calibrate it.
I had the Shunt mounted on the battery (-) Stud, and it had been filed flat and polished with 2000 grit sandpaper on all ring terminal mounting surfaces, and with a Dollop of CAig Deoxit shield applied to keep it at maximum conductivity.
It was just not a precise instrument.
For my project's purposes, it was adequate. I told the owner to NOt stop charging until about a half hour after the Amps read 0.0 at 14.4v. It would read 0.0 at 0.78 amps actual, and needed to taper to 0.625 amps before reduction of voltage, but it was close enough, and the 40 initial amps was more than enough to meet the Lifeline gpl-31XT 20% minimum charge rate when drained to 50%, or less.
It was able to read a 100 amp charging source pretty accurately though, compared to my clamp on Ammeter.
I had the Shunt mounted on the battery (-) Stud, and it had been filed flat and polished with 2000 grit sandpaper on all ring terminal mounting surfaces, and with a Dollop of CAig Deoxit shield applied to keep it at maximum conductivity.
It was just not a precise instrument.
For my project's purposes, it was adequate. I told the owner to NOt stop charging until about a half hour after the Amps read 0.0 at 14.4v. It would read 0.0 at 0.78 amps actual, and needed to taper to 0.625 amps before reduction of voltage, but it was close enough, and the 40 initial amps was more than enough to meet the Lifeline gpl-31XT 20% minimum charge rate when drained to 50%, or less.
It was able to read a 100 amp charging source pretty accurately though, compared to my clamp on Ammeter.
