I'm not sure if this is the best forum for this question, but here it is -
last fall I upgraded an aging AGM bank on my off grid property with a bank of LFP prismatic cells. nearly the same total capacity (~28kwh @ 24v) but of course the LFP allows much greater discharge. overall it's been a great improvement. but... the trimetric meter has trouble keeping track of the ah in/out. I have turned it up to 100% efficiency, but every day that the system cycles but doesn't reach totally 'full' (to reset the meter in the trimetric) the ah count gets further off of reality. it seems to not be counting the ah coming in (or is overcounting the loads, I guess) so that after a just a few days it will think the bank is at ~30% when it's actually at ~70%, and if I don't get a full charge for a few weeks, it can get way out of line... telling me that more ah have been removed from the bank than it can hold, by multiples. as far as I know the meter was accurate on the old bank, and nothing changed in the way the system is set up (except the addition of a BMS inline on the bank)
any ideas? TIA
last fall I upgraded an aging AGM bank on my off grid property with a bank of LFP prismatic cells. nearly the same total capacity (~28kwh @ 24v) but of course the LFP allows much greater discharge. overall it's been a great improvement. but... the trimetric meter has trouble keeping track of the ah in/out. I have turned it up to 100% efficiency, but every day that the system cycles but doesn't reach totally 'full' (to reset the meter in the trimetric) the ah count gets further off of reality. it seems to not be counting the ah coming in (or is overcounting the loads, I guess) so that after a just a few days it will think the bank is at ~30% when it's actually at ~70%, and if I don't get a full charge for a few weeks, it can get way out of line... telling me that more ah have been removed from the bank than it can hold, by multiples. as far as I know the meter was accurate on the old bank, and nothing changed in the way the system is set up (except the addition of a BMS inline on the bank)
any ideas? TIA