aztex Posted May 31, 2020 Report Share Posted May 31, 2020 Hi, I have 2 brand new Deka AGM 79Ah batteries installed in my trailer. The trailer has been store 2.5 months. First month I had been able to get out weekly and leave on a solar panel for a few hours and get 99% charge. In between I unplugged negative cable. Batteries was turned off inside trailer too. 3 weeks ago I brought both home and charged them with a high quality CTEK charger. Both connected I'd charge to 100% leave on trickle for a few days, un plug and monitor voltage daily. When down to 12.4v I'd recharge. This would take 3-4 days. Left the pair on charger the past 4 days and then installed in trailer to turn on fridge (using propane). I went back 4 hours later to confirm fridge cooling down and checked the batteries. Trailer battery volt meter said 11.8 volts! Multimeter 12.4v..... Should a battery set deplete 25% (charts say 12.4v is 75% capacity) in 4 hours? I confirmed the fridge is on propane and that should hardly use any battery power.... I'l know more tomorrow but am leaving town and if the hint of an issue I want to get to the dealer Monday before heading out. Anything about this raise serious concerns? Thanks! Quote Link to comment Share on other sites More sharing options...
DesertMiner Posted May 31, 2020 Report Share Posted May 31, 2020 (edited) Propane fridges use more dc amps then you might think. Somewhere “north” of 3 amp/s while running. Edited May 31, 2020 by DesertMiner Quote Link to comment Share on other sites More sharing options...
Kirk W Posted May 31, 2020 Report Share Posted May 31, 2020 Not if they stated in new condition but they may not have been. To measure battery voltage accurately you should let it rest with no current flow for at least an hour or two, both after changing and when in use. Quite likely, if you open circuit the battery and let it sit the resting voltage will rise. Quote Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
Sehc Posted May 31, 2020 Report Share Posted May 31, 2020 If not kept at 100% charged, the AGM battery could be done for after three months. But i bet you have a load some place. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.