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Old 10-17-2014, 06:03 PM   #1
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2 Brand New Interstate 6v Deep Cycle-75%...then 0

Just bought 2 brand new Interstate 6v Deep Cycle "Extreme" for the Icon 24A before going deep into the bush for some fishing way up North....10 hour drive, so, the Batteries were fully charged @ "Full."

The batteries performed perfectly for two days, pinned at "Full."

The third day, the batteries registered 75% so I decided to top them up using the Onan LP Generator.

The generator itself was a real bugger to start requiring 10 tries (with the requisite pause between) before it finally turned over. However, I noticed that after running the generator for 15 minutes or so, the panel still read 75%.

So, I gave up on the generator turned it off and ran the diesel instead. Much quieter and topped up the batteries in no time. 100% full.

However, that night, the batteries completely drained. To virtually zero. Each and every day after that, the batteries had to be topped up to full, but, drained to zero at night.

Any thoughts ?
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Old 10-17-2014, 06:16 PM   #2
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Your charge indicator was showing the surface charge of the batteries.
The gauge , puts no load on so after a short time with alternator output, particularly immediately after engine shut down they will show full charge volts. After the furnace fan load for the night they were fully dead.
At 75% the charge time would have been 5>7 hours. MINIMUM.

More info;

The 12volt Side of Life (Part 1)
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Old 10-17-2014, 08:12 PM   #3
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You need a good battery gauge that will accurately tell you what is going on
With your batteries .

This is the one to get.


http://www.bogartengineering.com/sit...0low%20res.pdf

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Old 10-17-2014, 11:58 PM   #4
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We didn't run anything at all on the batteries overnight, but thanks for the link...I'm going to give it a read now.
What I do not understand is how the batteries went from 75% to 0 with nothing running on them overnight.
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Old 10-18-2014, 12:07 AM   #5
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They weren't at 75%, you were reading the surface charge only. With our 8.0KW gen it takes at least 2 hours to bring our four U-2200's back to about 80%, which is not fully charged but easily gets us through the night. To get that last 20% would take another 2 to 3 hours of gen run time.
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Old 10-18-2014, 01:06 AM   #6
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Buy a hydrometer, about $10, and check each cell to determine if the batteries are good. One bad cell can draw down both batteries.

Using a Hydrometer - E-Z-GO Product Training Manual
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Old 10-18-2014, 01:44 AM   #7
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Quote:
Originally Posted by 88keys View Post
We didn't run anything at all on the batteries overnight, but thanks for the link...I'm going to give it a read now.
What I do not understand is how the batteries went from 75% to 0 with nothing running on them overnight.
With the batteries showing full charge for 2 days then 75%, then down to, 0 overnight with no load. Either your battery monitor is no good, or one of the batteries has issues. Fully charge the batteries and have them load tested, and consider a different monitor.

BTW; it would be helpful to know more about your RV, year make and model.
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Old 10-18-2014, 09:39 AM   #8
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Hi Skip :
Yes, thanks for the info on Gen. charge times.
It's an '09 Fleetwood Icon 24A....Dodge/Merc Diesel.
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Old 10-18-2014, 11:09 AM   #9
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Quote:
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Hi Skip :
Yes, thanks for the info on Gen. charge times.
It's an '09 Fleetwood Icon 24A....Dodge/Merc Diesel.
If you go to the " Edit Signature " on the left side of your " User CP" page you can type in the info, on your coach, then click save at the bottom of the page, it will automatically appear below your posts , as mine does below this one. Saves typing it in every time, you post.
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Old 10-18-2014, 02:52 PM   #10
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Quote:
Originally Posted by Skip426 View Post
If you go to the " Edit Signature " on the left side of your " User CP" page you can type in the info, on your coach, then click save at the bottom of the page, it will automatically appear below your posts , as mine does below this one. Saves typing it in every time, you post.
Done !
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Old 10-18-2014, 05:58 PM   #11
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To fully charge a set of Flooded wet cells from 75% to full with the PROPER converter (30 percent of the c/20 rating of the batteries) That is a 70 amp converter Would take:... About an hour to find 90% then 3-4 hours for the last 10%.

Smaller converter add to the first step

But you are looking at 4-5 hours generator run time to fully charge IF you have a 60-70 amp converter if you only have a 45-50. will take longer.

Oh and this also assumes a 3-stage converter such as the Progressive Dynamics 9200.... IF you have a single stage Parallex.. Longer still.
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Old 10-18-2014, 07:38 PM   #12
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Why not just run the generator when you need power?..like at night while cooking and watching TV?....and allow the batteries to charge during that time?
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Old 10-19-2014, 04:45 PM   #13
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Update....
We drove home from our trip...about 10 hours drive. The batteries charged up to 100% and, again, stayed 100 % charged for two days and then dropped to 75% with nothing at all running on them other than the "Aux ON."
...will need to check for a parasitic drain, amongst other things....will keep you posted....interesting electrical gremlins.
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Old 10-20-2014, 12:00 AM   #14
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Check to ensure everything was connected correctly after replacing them. I have some items that pull directly off the batteries lugs and if they were wired to only 6vdc of the series it would kill one of the batteries pretty quick
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