Voltage on Deep Cycle Batteries??

Submitted: Saturday, Jul 10, 2004 at 19:46
ThreadID: 14543 Views:2135 Replies:8 FollowUps:7
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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..
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Reply By: Lynn2 - Saturday, Jul 10, 2004 at 19:59

Saturday, Jul 10, 2004 at 19:59
Have a read:-

http://www.uuhome.de/william.darden/
AnswerID: 67250

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.
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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.
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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.
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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
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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.
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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) ;-)
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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.
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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

Sunday, Jul 11, 2004 at 09:30
Nobby,

Have a look at this site. It contains a chart plus other good infromation.

http://www.windsun.com/Batteries/Battery_FAQ.htm

Jim.
AnswerID: 67298

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

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