"Bob Engelhardt" wrote in message ...

On 1/14/2021 10:56 AM, Jim Wilkins wrote:
....
I haven't used the 100A DC meter very much because my battery application
really needed a meter that shows + and - current. The 20A version is fine
on pure DC test current until it wanders out of calibration, possibly due
to the dawn and dusk fluctuations of solar panel voltage. On pulsed
current in or out of a PWM or MPPT solar controller none of my meters
agree.
...

It's winter, there's a pandemic, so you're stuck in the house and what
you need to do is build the meter that does exactly what you need it to
do. Can't be that hard? Just an Arduino and some code ... Bob's your
uncle. BG

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I would need better A/D sensitivity and resolution and NOT one common ground
for what I'm doing. It's working pretty well right now with homebrew
discrete analog power circuits and diode switching 'logic'. Unfortunately I
haven't found inexpensive UL-rated substitutes for the modules I can build,
but not sell.