my 712 monitor will show battery voltage of 12.1 volts, yet the battery % shows 71% and my AH's show -158 out of a 440 AH battery bank. this does not make sense to me. 12.1V should show a battery down 50%, not 71%. 158 AH out of 440 AH should show 36% for the battery %.
my question is, what is a reliable source of info on the state of the battery? should i use the voltage, the battery % or the AH's? Are any of those measures actually accurate? if there is any charging or a draw on the battery, i would think the V is not an accurate measure.
Also, why would my monitor show 71% on the battery but show 12.1 V? is that just because there was a drain on the battery at the time so the V is not accurate? i would think those 2 numbers are tied together.