Phase A Voltage low - tips for calibration?

[eklee]

My voltage for Phase A seems kind of low while Phase B looks high:

What is the best way to calibrate the voltages? I am thinking of using a multimeter to measure the voltage between the Vue's black breaker and ground to get phase A voltage, and Vue's red breaker and ground to get phase B voltage. Then use the formula <in-use calibration value> * <accurate voltage> / <reporting voltage> to derive the calibration value in the yaml file. Is this the right approach?

BTW, thanks for the great project!

[flaviut]

<in-use calibration value, default .022> * <accurate voltage> / <reporting voltage>

Spot-on!

It would be nice to automatically do this, since the calibration values depend on which order the phases are hooked up, but I haven't been able to reverse engineer this part of things. Ghirda doesn't disassemble floats well :(

[Jens5395]

I went through recalibrating and came up with calibration: 0.02292 and 0.0214 for phase A and B respectively. I used a trial and error approach of tweaking the number, uploading the new configuration, check the voltage shown and repeat until I was close enough. While it sounds tedious, it wasn't really that bad.