Group 27 AGM mid life performance report
My 90AH Northstar AGM battery is now 38 months old, and has accumulated ~465 deep cycles. When I cycle it, generally I consume 35 to 65AH nightly, average about low 40's Since June of 2015 it ...
Forum Discussion
LY thanks for the tip about leaving the higher voltage on until the batts are actually full before dropping to 13.7.
I just went out and checked my AGMs which have been on 13.7 since last evening after getting 70AH back in from being 80AH down. Say 94% SOC at the time. That's when I dropped the voltage to 13.7 from 15ish.
Trimetric now says they are 74.6 AH back up. That's only 4.6 more AH.
So I cranked the voltage back up to 15 and amps went up-- about 0.4 amps now, so I am gaining AH again. Sort of.
I guess I have to wait till the batts are down to no amps like Phil does, since the AH counter can be off a little.
EDIT--I think I should go to some AH "over" and not just back to where it was to be at True Full. 115% is sometimes quoted, but the Tri has a heat loss fudge factor so maybe not that much over using the Tri.
I need an AGM hydrometer, and I need it right now!!!! :(
I just went out and checked my AGMs which have been on 13.7 since last evening after getting 70AH back in from being 80AH down. Say 94% SOC at the time. That's when I dropped the voltage to 13.7 from 15ish.
Trimetric now says they are 74.6 AH back up. That's only 4.6 more AH.
So I cranked the voltage back up to 15 and amps went up-- about 0.4 amps now, so I am gaining AH again. Sort of.
I guess I have to wait till the batts are down to no amps like Phil does, since the AH counter can be off a little.
EDIT--I think I should go to some AH "over" and not just back to where it was to be at True Full. 115% is sometimes quoted, but the Tri has a heat loss fudge factor so maybe not that much over using the Tri.
I need an AGM hydrometer, and I need it right now!!!! :(
