Went camping off grid in the TC and got to try out the Renogy 500A monitor for real.
To add to previous info in this thread, the AH counter reads from the set capacity (200AH for mine) and goes down showing ever lower AH like 123AH eg. AH comes back up with any charging such as from solar. Voltage shows a bit lower for loaded voltage and higher for when little load and the amps show as plus or minus. It all works great.
The percentage shows along with the AH amount which is just AH left after subtracting what was used from 200. Eg, AH showing 129AH, 12.5 volts, 65%, with 1.85a load.
Happens that resting spec voltage of 12.54v with these batts is 65% so that checks out. 129/200 = 64.5%
I have not got to the stage where I have to consider charging efficiency with these batts, so for now I am ignoring it. It is working "close enough" so far.
I decided I really like this monitor.
EDIT: at home, got it recharging on converter and monitor now says 200AH and 100%, but the batts are still accepting 5.64 amps at 14.6v. they are Truly Full when amps get down to 1 amp (1/2 an amp per 100AH) if I use regular AGM specs for that.
This means the AH restored was not as many as the monitor thinks, by some heat loss amount. Trimetric uses 94% for that on recharging AH count. If "battery attenuation" is the same thing with this Renogy there is a setting for that I can play with---if that is what it is.
Meanwhile I wait till amps get down to 1 amp on the monitor and then dial the converter back to a Float voltage such as 13.4 and the monitor would be set to 200AH/100% except it is already there, so have to see whether it counts down right next cycle.
