Readings on the panel under load are all but meaning less. HERE is why
Voltage SOC readings MUST be taken at the battey and static, cause that's the chart, but if you have any load, at the panel, then you have the following things all affecting the voltage
Battery SOC
Battery AGE (Internal resistance)
Battery Type (AGM for example are supposed to have less internal resistance, DEEP CYCLE have more than starting and so on)
Resistance of connections each and every one from the battery to the volt meter
This includes any disconnect switches or solenoids. Fuses and such
Finally the resistance of the wire and how big the load is.
All this equals much lower readings at the panel than at the battery and none of them translate to state of charge less you also know the precise amount of load and have some very advanced charts..
I look for the following on my panel: FULL = Converter working
NOT FULL = converter unplugged
And that is all.
