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ron_whitt 
Senior Member 
Joined: 08 Sep 2011 Location: Chesterville On Online Status: Offline Posts: 261 |
 Calendar Event: 12volt deepcell battery readout on multimetrePosted: 06 Dec 2020 at 7:23am |
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What should a deep cell 12volt battery read on a multimetre if fully charged and how low should you let it get?
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Ron & Shirley
2020 Tacoma 2012 177 rpod |
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offgrid
Senior Member
Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
Posted: 06 Dec 2020 at 9:20am |
This should be close. But, you have to allow the battery to recover to its open circuit voltage (no charging or discharging) for at least 30 minutes before measuring it. Unless in an emergency, its best not to go below about 50% state of charge (around 12V) if you want to get long life out of your batteries.
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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jato
Senior Member
Joined: 23 Feb 2012 Location: Kewadin, MI Online Status: Offline Posts: 3220 |
Posted: 06 Dec 2020 at 4:35pm |
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When boondocking we change ours out at 12.2 v. or 60% S.O.C. Since winterizing our 177, batteries were pulled and moved to our unheated garage on the concrete floor. Both batteries got a 24 - 30 hour 2 amp trickle charge on October 24 here in northern Michigan. Just checked them yesterday, 6 weeks after receiving the charge; they read 12.64 v and 12.61 v respectively. Not too bad for a pair of nearly 10 year old 12 volt Interstate, group size 24, deep cycles.
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God's pod
'11 model 177 '17 Ford F-150 4WD 3.5 Ecoboost Jim and Diane by beautiful Torch Lake "...and you will know the Truth and the Truth will set you free." |
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Colt
Senior Member
Joined: 16 Nov 2019 Online Status: Offline Posts: 383 |
Posted: 07 Dec 2020 at 10:44pm |
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There is a little variation because of chemistry and design, but expect 12.7 +/- 0.1V. AGM batteries are usually 12.8V at 100%, resting.
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John
'16 R-Pod 180 |
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12volt deepcell battery readout on multimetre - Event Date: 06 Dec 2020