Voltage on Deep Cycle Batteries??
Submitted: Saturday, Jul 10, 2004 at 19:46
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Member - Nobby
What voltage should be on a fully charged DC Battery.
Mine (2 x 105a) have been on solar charge(160w) for a week and still only show 12.6amp when I assumed that that fully charged would read 12.8amp. I also figure that a week would be enough to fully charge them, as they were 12.2amp when I started..
Reply By: Lynn2 - Saturday, Jul 10, 2004 at 19:59
Reply By: Lone Wolf - Saturday, Jul 10, 2004 at 20:01
Saturday, Jul 10, 2004 at 20:01
12.8 at no load is what
mine stay at.
Cheers
Wolfie
AnswerID:
67251
Reply By: Mad Dog (Victoria) - Saturday, Jul 10, 2004 at 20:55
Saturday, Jul 10, 2004 at 20:55
Wouldn't worry too much
Nobby, it depends on battery chemistry, temperature and manufacturer. I take it 12.6 is the reading off charge after resting for a few hours.
AnswerID:
67259
Follow Up By: Member - Nobby - Sunday, Jul 11, 2004 at 18:17
Sunday, Jul 11, 2004 at 18:17
Yeah.. while I am charging them the voltmetre goes as high as 14.2 but after unhooking everything it will drop to 12.6 after a few hours.
FollowupID:
328056
Follow Up By: Mad Dog (Victoria) - Sunday, Jul 11, 2004 at 18:23
Sunday, Jul 11, 2004 at 18:23
You have nothing to worry about
Nobby, 12.6 falls within the fully charged range.
FollowupID:
328061
Follow Up By: Mad Dog (Victoria) - Sunday, Jul 11, 2004 at 18:29
Sunday, Jul 11, 2004 at 18:29
btw
Nobby, a more accurate way to measure state of charge is to use a hydrometer. Anway read the battery faq and the windsun site mentioned below if you already haven't and you'll be an expert.
FollowupID:
328062
Reply By: Topcat (WA) - Saturday, Jul 10, 2004 at 21:10
Saturday, Jul 10, 2004 at 21:10
If your battery is in good condition the voltage (open circuit) should read around 12.6 volts & the electrolyte should have a specific gravity reading of 1.265 at ambient temperature (26.7 deg. C).
AnswerID:
67262
Follow Up By: Lone Wolf - Saturday, Jul 10, 2004 at 21:35
Saturday, Jul 10, 2004 at 21:35
Top Cat........ that is one sweet Rig Gif mate, good work!
Cheers
Wolfie
FollowupID:
327984
Follow Up By: Topcat (WA) - Saturday, Jul 10, 2004 at 23:03
Saturday, Jul 10, 2004 at 23:03
Yeah Wolfie, took a caption off the latest Garfield flick. Just couldn't resist it!!!!! Cheers.
FollowupID:
327993
Follow Up By: Member - Sparkie (QLD) - Sunday, Jul 11, 2004 at 15:38
Sunday, Jul 11, 2004 at 15:38
Well done Topcat
Best one I have ever seen.
And with my wife sitting next to me eating chips I've got smellovision as
well....;-)
Sparkie(IE not Y) ;-)
FollowupID:
328038
Reply By: Eric Experience. - Saturday, Jul 10, 2004 at 22:00
Saturday, Jul 10, 2004 at 22:00
Nobby.
Check you meter agianst a known good battery, sounds like you meter is .2 volt low.
Eric.
AnswerID:
67271
Follow Up By: Member - Nobby - Sunday, Jul 11, 2004 at 18:19
Sunday, Jul 11, 2004 at 18:19
Eric I have three metres. One a guage type, one a LED readout and my multimetre and they all read the same.
FollowupID:
328057
Reply By: Magnus - Saturday, Jul 10, 2004 at 23:49
Saturday, Jul 10, 2004 at 23:49
I agree with Lynn2. I printed out that article some time ago and filled it away. Often refer to it.
Has to be the best source of that sort of info around
Cheers
Magnus
AnswerID:
67283
Reply By: Jimbo - Sunday, Jul 11, 2004 at 09:30
Reply By: Flash - Sunday, Jul 11, 2004 at 19:28
Sunday, Jul 11, 2004 at 19:28
The VOLTAGE also depends on temperature.
Checking just the voltage is a very unreliable way to measure state of charge.
AnswerID:
67357