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Old 01-30-2014, 08:41 AM   #11
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I contacted my local agent at Deka Batteries for information when I was programming my battery monitor:

The agent for Bucks county is :

DAVE ECKHART
Phone : 610-944-3140 ext. 3800
Email : deckhart@dekabatteries.com

EAST PENN MANUFACTURING COMPANY INC
DEKA ROAD
LYON STATION, PA 19536

I also have a pair of Deka DP-24's

He said my battery is 75 AH and that seems to work OK as a setting in the computer; but is in reality "high" for this Dual Purpose Marine battery. I have been waiting for them to die - or even get sick - (5 years on the pair now) but they seem to want to live forever.

To convert RC (Minutes of Reserve Capacity at 25 AMPS - the "Industry Standard") to AH (Amp Hours - hours capacity at 20 amp draw) the minutes available at 25 amps is multiplied by 0.4167.

Trying to use the 110 minutes at 23 amps (stamped on the battery) is tricky due to the Peukert Effect which makes AH capacity non-linear based on actual demand. (See chart and document on the effect.)

Using Awwall's 120 minutes at 25 amp RC; the calculation results in a 50 AH capacity as he states and seems much more correct than the 75 AH quoted by the Deka Rep back in 2009 when the batteries were new.

My performance is most likely even worse when you conciser the charge/discharge cycles my battery has undergone in 5 years.

See capacity reduction vs charge cycles graph as well.
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File Type: pdf Convert RC to AH.pdf (141.3 KB, 40 views)
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Old 01-30-2014, 08:43 AM   #12
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For some reason my JPG is not showing on my PC so here goes again.
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Old 02-03-2014, 03:15 PM   #13
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Given this charger/maintainer - it has switched over to "maintain" mode. Is it safe to leave hooked up for another couple of weeks until we get the camper back?

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Old 02-03-2014, 03:19 PM   #14
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Quote:
Originally Posted by ependydad View Post
Given this charger/maintainer - it has switched over to "maintain" mode. Is it safe to leave hooked up for another couple of weeks until we get the camper back?

I don't see why not...
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Old 02-03-2014, 03:34 PM   #15
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I would say yes, fully automatic. Also did you find built date underneath battery?
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Old 02-03-2014, 03:54 PM   #16
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Completely forgot about it. I'll check shortly...
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Old 02-03-2014, 04:04 PM   #17
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With a battery that you can take the caps off. check each cell to see if you have any weak ones after you have charged it up.



https://images.search.yahoo.com/sear...rometer+tester
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Old 02-03-2014, 04:09 PM   #18
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Doug - Looks like that charger will maintain with a very low current for an extended period so you should be fine to leave it connected.

But, you could also just leave your batteries in storage unconnected. A healthy battery will take months to self-discharge in storage where they are not hooked up to anything.

Plus, you can test them in a couple of weeks to see if they are still holding the charge. Make sure to add distilled water if needed before you store.
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Old 02-03-2014, 04:25 PM   #19
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Quote:
Originally Posted by Triguy View Post
Doug - Looks like that charger will maintain with a very low current for an extended period so you should be fine to leave it connected.

But, you could also just leave your batteries in storage unconnected. A healthy battery will take months to self-discharge in storage where they are not hooked up to anything.

Plus, you can test them in a couple of weeks to see if they are still holding the charge. Make sure to add distilled water if needed before you store.
Understood and that's actually how I have handled the last two seasons. Whenever I would store the camper for more than a couple of days, I would disconnect the battery using the battery disconnect my father-in-law and I installed (when you read that, understand that he did 90% of the work and I held the flashlight).

I may get a hydrometer to test the battery itself. Thanks for the idea, if nothing else.
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Old 02-11-2014, 08:28 AM   #20
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Here you go.

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Harbor Freight

I caught these on sale for $2.99 a couple years ago. Keep one on my mower all winter and on the ATV if not using it for a while.
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