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Topic: Long Term Storage with no AC power (Read 1237 times) previous topic - next topic

Re: Long Term Storage with no AC power

Reply #25 –
Quote from: LTG –
Refer to the East Penn Manufacturing Deka Dominator brochure  "E.P.M. Form No. 0909 Rev. 4/13."

Larry

The tag on my recent three 8g8d's from them said max charge to be at 14.15 volts?  Which was a slight increase from the previous max according to him. 

Maybe smaller sizes might be different? 

Funny that they also show a max charge battery after a day left unhooked up to anything to be 12.85 volts.  My buddy and I both show 13.15 volts after a max charge voltage of 14.10-14.15 and a minumum of fifteen cycles of use. 

Pressure build up in the cases past the 14.15 may bulge the cases permanently and/or vent is what used to happen to us.  Blew up a lot of batteries before we figured it out. 

14.6 last I asked him I think was Agm? We had this discussion many times including last week in person and he was vogues factory electrical systems engineer thirty years ago and constantly has busses and nice Rvs in for major and minor electrical systems work. 

I have been testing my coaches system to verify max dry camp capacity for the last two years.

Funny that the website might have errors on it.  I see what you noticed but I would not go past the 14.15 that the battery states on it when shipped myself. 

My buddy has had lots  bulged case DEKA 8g8d's he recycled from too high a charging  voltage.

Like I mentioned we have had this exact conversation maybe a half dozen times in the last year.  Verified it again  this week.

My link 2000 does not seem to accurately show the recharging amp hours after discharge. 

My 130 watt solar panel may be involved as its possible its 7 amp charge might not be reflected in the gauges amp hours showing.

If I switch functions on the links panel sometimes the minus amp hours shown change to reflect a lower minus number than before I switched the display from amp hours to percentage to volts. 

My buddy said the software might be an old version or the gauge itself funky as its 18 years old or just inaccurste. 

Sure would not charge the 8g8d's at 14.6 volts myself after many conversations.

Love to find out that they can be charged that much without damage btw.  He said no.





"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Long Term Storage with no AC power

Reply #26 –
Quote from: LTG –
Refer to the East Penn Manufacturing Deka Dominator brochure  "E.P.M. Form No. 0909 Rev. 4/13."

Note the revision date; possibly applies to newer manufacturing date Deka Dominator batteries  http://www.dekabatteries.com/assets/base/0909.pdf  "For 12-V batteries, charge to at least 13.8 volts but no more than 14.6 volts at 77 F (25 C)"

The old brochure, revision date 02/06 says minimum 13.8, maximum 14.1 at 20 C  http://www.dekabatteries.com/assets/base/epm0909.pdf "For 12-V batteries, charge to at least 13.8 volts but no more than 14.1 volts at 68 F (20 C)"

Probably worth a call to East Penn tech support if one has a question relative to their particular Deka batteries (have your manufacturing date handy) as it sounds like something has changed with the newer batteries.  They won't be able to help with OP Jim's GNB Exides, though. 
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Long Term Storage with no AC power

Reply #27 –
Quote from: Michelle –
The old brochure, revision date 02/06 says minimum 13.8, maximum 14.1 at 25 C  http://www.dekabatteries.com/assets/base/epm0909.pdf

Please note that the quoted brochure states the maximum 14.1 is at 20 C.

That makes the charging voltage even further apart between the two brochures.

BTW, I received that brochure after calling Deka. When I purchased our coach from Foretravel in 2013, they had just installed a new Xantrex SW3012 Inverter/Charger. That charger has a Bulk/Absorption charge preset voltage of 14.4 volts. I was concerned about the Deka Dominators being overcharged.

Larry
Larry and Terry
Ex 2004 U270 36'

Re: Long Term Storage with no AC power

Reply #28 –
The Mk battery website shows the Mk 8g8d gel battery to have the max charging rate to be 2.43 vpc at 25 c. That is 14.58 volts at 25 C.

http:/mkbattery.com/images/8g8d.pdf

Sorry, I do not know how to post a link to a website.

Larry
Larry and Terry
Ex 2004 U270 36'

Re: Long Term Storage with no AC power

Reply #29 –
Quote from: LTG –
The Mk battery website shows the Mk 8g8d gel battery to have the max charging rate to be 2.43 vpc at 25 c. That is 14.58 volts at 25 C.

Larry - East Penn is the manufacturer of MK as well as Deka (and several other brands).
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Long Term Storage with no AC power

Reply #30 –
Thanks Michelle,

I posted the MK reference to show that both the Mk and Deka gells have the same charging voltage. That means that the Deka brochure is probably not an error in stating a charge max of 14.6 at 25 C.

The orginal OP's battery may indeed have a max voltage of 14.1

I made my post because in the short time I have been a member on this forum, I have seen quite a few reference to a max charge of 14.1 for gell batteries. I just wanted FoFums to be aware that Deka has changed the max voltage on their Dominator gells.

Larry

Larry and Terry
Ex 2004 U270 36'

Re: Long Term Storage with no AC power

Reply #31 –
Quote from: LTG –
I made my post because in the short time I have been a member on this forum, I have seen quite a few reference to a max charge of 14.1 for gell batteries. I just wanted FoFums to be aware that Deka has changed the max voltage on their Dominator gells.

And thank you for that ^.^d  - unless one had recently visited the Deka or MK page, we wouldn't know they had.  I certainly didn't and I appreciate finding out about it.  The question for East Penn is whether they just changed the charging recommendation or did something physically change in the batteries themselves beginning in 2013.  I suspect the latter but don't have any actual info.
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320