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Author Topic: Battery Bank charges  (Read 571 times)

Desert_Rat

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Battery Bank charges
« on: January 09, 2017, 12:10:37 PM »
So Deca CS tells me that 50% charge on my GC15's http://www.dekabatteries.com/assets/base/0248.pdf is reflected with 24.4v charge on bank, and 100% charge is 25.2. That doesn't sound right to me because 24.4 is still over 24v rating. I would think that 50% depletion is less then that? maybe around 22v or something? Should I take her word as word? Without my MPPT which isn't installed yet, is there any other way to properly determine depletion?

Gary RV_Wizard

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Re: Battery Bank charges
« Reply #1 on: January 09, 2017, 06:02:50 PM »
Sounds about right. 50% on a typical 12v battery is about 12.06v.

For batteries built of multiple standard cells, 2.01-2.05 volts per cell is widely accepted as the 50% mark, and 2.1 volts/cell is 100%. I'd call it an even 24v for 50% on 12 cells, since it's only a yardstick anyway. No need to be over-precise.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

Desert_Rat

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Re: Battery Bank charges
« Reply #2 on: January 09, 2017, 06:29:23 PM »
Thanks for input

AStravelers

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Re: Battery Bank charges
« Reply #3 on: January 11, 2017, 07:34:04 AM »
So Deca CS tells me that 50% charge on my GC15's http://www.dekabatteries.com/assets/base/0248.pdf is reflected with 24.4v charge on bank, and 100% charge is 25.2. That doesn't sound right to me because 24.4 is still over 24v rating. I would think that 50% depletion is less then that? maybe around 22v or something? Should I take her word as word? Without my MPPT which isn't installed yet, is there any other way to properly determine depletion?

Go to this link http://www.marxrv.com/12volt/12volt.htm about the 12V side of RV's.  Yes, I know you are 24V, but you are still using lead acid batteries, so just double the voltages.   Scroll down to see the chart about state of charge (SOC) and the corresponding voltages.   
Al & Sharon
2006 Winnebago Sightseer 29R
2009 Chevy Colorado 4X4

http://downtheroadaroundthebend.blogspot.com/

 

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