I use cheap meters to check battery voltage. The only thing you get by
checking the voltage is an idea how much of a charge you have. If you look at
the charts on voltage vs. charge you will see the battery must rest for many
hours to use the chart reliably.
That being said, an option to check the accuracy of your meter is to use a
high quality spdt switch. One connection connected to the battery bank. The
other connection to a regulated power supply. you can use the power supply to
verify the meter before you trust the battery reading.
Another option would be to use op amps in conjunction with your power supply
output to light an LED as a warning when the half way mark was hit on your
journey. Or you could set the op amp to signal a fully charged bank. Of course
only high quality small tolerance components will help with such a set-up (the
problem with low end meters).
As we all know only a complete monitoring of the power in, power out, will
give you any useful information.
Kevin Pemberton
On Monday, December 22, 2014 09:22:27 AM you wrote:
> I have used the inexpensive digital panel meters for years and not found
> them to be significantly inaccurate or unreliable, as verified by using a.
>
> A quality digital meter is the best investment you can make. A basic Fluke
> can be had for around $150 and will last a long time. The two Flukes I
> have, going on 30 years, are still as good as when I bought them!
>
> John
>
> Flatwater Electronics
> www.flatwaterfarm.com
> "Neurosurgery for computer looms."
Posted by: Kevin Pemberton <pembertonkevin@gmail.com>
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