12v deep cycle

Submitted: Tuesday, Jan 19, 2010 at 21:38

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Battery Power

In this article we explain why you might need an additional power source independent of the starting battery installed into your vehicle and we look in detail at types of batteries,

Samuls35

Got a 12v deep cycle battery and one of those cheap multimeter wondering how i would go about measuring the voltage output and what voltage is full and empty . thanks

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Reply By: Peter_n_Margaret - Tuesday, Jan 19, 2010 at 21:55

Tuesday, Jan 19, 2010 at 21:55

Samuls35, a multimeter is a very unreliable method of measuring state of charge.
The battery must be rested some hours before a guess can be made, then 12.0 is as low as you want to go and about 12.6 is full, but even those numbers can vary according to the battery type.

Cheers,
Peter
OKA196 Motorhome.

AnswerID: 400255

Reply By: ABR - SIDEWINDER - Tuesday, Jan 19, 2010 at 22:05

Tuesday, Jan 19, 2010 at 22:05

SOC can be measured with volts if the battery is rested.

As mentioned above it is not 100% as it does not show the true capacity but at a glance you can diagnose SOC and any related problems.

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AnswerID: 400257

Reply By: Samuls35 - Tuesday, Jan 19, 2010 at 22:08

Tuesday, Jan 19, 2010 at 22:08

Thanks for your replies what would be the best way to find a soc with know rest time

AnswerID: 400259

Follow Up By: CJ - Tuesday, Jan 19, 2010 at 22:15

Tuesday, Jan 19, 2010 at 22:15

no easy way - you must rest them

FollowupID: 669371

Reply By: PradOz - Tuesday, Jan 19, 2010 at 22:31

Tuesday, Jan 19, 2010 at 22:31

A couple links that if read in full may help you understand a little more

multimeter

batteries etc

cheers....

AnswerID: 400267

Reply By: RV Powerstream P/L - Wednesday, Jan 20, 2010 at 12:42

Wednesday, Jan 20, 2010 at 12:42

A Battery Bug can do the job just fix to pos and neg post and set .
They come in 90A 150A and 300A.
300A currently out of stock.
An explore oz member bought the last one yesterday so Im told.
Just Google Battery Bug by Argus and read about them.
Ian

AnswerID: 400319

Reply By: Moose - Wednesday, Jan 20, 2010 at 14:34

Wednesday, Jan 20, 2010 at 14:34

If you want to know whether it's charged or not and if it's not a sealed unit buy a hydrometer and check each cell. You can get one for a few bucks from SuperCheap or similar.

AnswerID: 400335