Originally Posted by trt7704
My AGM's 8yrs old (4 Lifeline 105 amp hrs. each) will not maintain voltage over 24hrs at anchor. The voltage drops to under 11.05 volts within 24 hrs. but the amp hrs. are still above 300...
As previously noted, an 8-year useful life isn’t bad for batteries that have been “rode hard & put away wet”. Sulfation of Batteries starts
when specific gravity falls below 1.225 or voltage measures less than 12.4 (12v Battery).
Since an open circuit voltage of much less than 12.20V (S.G. 1.190) generally indicates a functionally discharged battery (in your case about 200 A/Hr remaining)
, I wonder if your Battery Monitor
Sometimes, a deep discharge, followed by a slow charge will recover lost
Battery capacity and charge acceptance.