Early Battery Failure
papab Registered Users Posts: 66 ✭✭
edited October 2021 in Caravan, Recreational Vehicle, and Marine Power Systems #1
I've had a Renogy 200 Ah AGM battery for a little over 2 years, but it has been used very little. It have kept it charged up, always charged it up pretty quickly after use and kept it on a float charge at 13.3 - 13.4 V. I haven't really used it much until recently and I've found that it doesn't have any capacity. I have a Trimetric battery monitor. I just did a discharge test and with a 16 amp load it only had 27 Ah capacity down to 11.0 V (when the inverter trips off). After the discharge test, VOC after 2 hours was 12.7V ?.
I charge the battery using a 3 stage charge controller, a Victron solar charge controller or a Xantrex charger (when I have grid power).
Initially I didn't have it on the batt mon, I was using another battery as my primary battery, and had this one disconnected. When I did use it I monitored the finish amps pretty carefully using the victron app and had it switch to float at around 2 or 3 amps. Most trips in the van were a few days or a week at most before I was on grid power and had it on float.
On my most recent trip, it was at around 85-90% SOC by morning. I tried to charge an ebike that only needed about 100 Wh and it couldn't do it. When charging it takes a long time (5 hrs), to get to 106% returned percent of charge and around 0.5% end amps.
I'm really picky about taking care of this so I'm stumped as to what could have gone wrong. The only mistake I can think of was one time I left it charging overnight at 14.2 V. Another time it was in a Phoenix garage for 5 or 6 days with temperatures peaking at around 105 or 110F.
Any ideas as to why this has failed?
350 W rooftop Solar, parallel
Victron MPPT 100/30, temperature compensated
Xantrex Truecharge2 60, temperature compensated
Renogy 12V/200Ah AGM
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