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Old 08-24-2015, 02:35 PM   #1
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Charging advice for this scenario

I have a 2016 27RLS.

I have 2 Crown Marine dual purpose 12 volt 24DP550 690 75A 105/25A batteries connected in parallel.

I have the WF-8955PEC converter with the 3 stage charge manager...apparently NOT the charging wizard in the owner's manual

I run 2 Honda e2000 companion generators with my 30amp plugged in.

I have one of those 12v battery status devices plugged in to the 12v receptacle by the TV. It shows the current voltage.

Ran both gens for 3 hours this morning (with nothing extra on in TT) on non-eco mode and the charge rate was VERY slow. In 3 hours going from showing 13.78 volts to 13.81

Am I asking too much of the generators? ideas?

Thank you in advance
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Old 08-24-2015, 02:46 PM   #2
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They are charged to the max and any good charger cuts back to maintenance (trickle) when the battery's full.
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Old 08-24-2015, 02:52 PM   #3
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Should those generators charge that battery configuration without a problem?


How long should it take?
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Old 08-24-2015, 03:14 PM   #4
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Yes the gen set will power the converter which will charge the battery(s)
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Old 08-24-2015, 03:17 PM   #5
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How long should it take? That's what I'm after. It seems like it is VERY slow to charge
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Old 08-24-2015, 03:18 PM   #6
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Sounds like they may be at full charge?
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Old 08-24-2015, 03:56 PM   #7
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Thank you everyone. I'll keep an eye on this. I'm thinking it could be a perception issue as well
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Old 08-24-2015, 04:15 PM   #8
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Check the voltage before you start the charging and meter how long till 12.5 plus (full) I suspect they are charged before the 3hrs, but you got 110 with em running.
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Old 08-25-2015, 02:43 PM   #9
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Dave you are already at a full charge any higher output and you will start to boil the batteries. Relax grab a beverage
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Old 08-26-2015, 07:39 AM   #10
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Thank you again for all the help.

The batteries do indeed get up to a full charge, but the charge does not hold through any real use. I can watch the voltage drop steadily from 12.65 down if I turn the heater on in the morning until it's out.

I am reading these batteries I have:
Crown Marine dual purpose 12 volt 24DP550 690 75A 105/25A

May not be the best choice, although one came with the TT. I bought the other to match.

Are you guys doing the 2x6V in series thing? Is this better than 2x12V in parallel? Do I even understand that correctly?
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Old 08-26-2015, 07:58 AM   #11
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A problem I have with your setup:


When running on the genset the television 12V outlet will be powered by the converter, not the battery. So you won't be seeing battery health until you disconnect the "shore power" and the converter is dropped from the circuitry.
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Old 08-26-2015, 08:36 AM   #12
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Quote:
Originally Posted by dangerdave View Post
May not be the best choice, although one came with the TT. I bought the other to match.

Are you guys doing the 2x6V in series thing? Is this better than 2x12V in parallel? Do I even understand that correctly?
Mike837go is correct. When you want to take a battery reading after charging, you need to let the batteries rest for awhile and then check the voltage.

As for if your batteries are the best choice, that depends on what you plan on using them for.. Just to perform as a TT battery with no dry-camping then any RV/Marine battery will fill the need. If you plan on doing some dry-camping.. then you need to look at it from another angle. You will need to know what your DC electrical needs are currently and what they will be in the future and then move over to a TRUE DEEP CYCLE battery that will fit your needs and $$$ BUDGET.

A few things to understand are that electric motors (heater fan, water pump, non LED lights...) are not a batteries friend. They will drain your batteries at a pretty good rate.

A pair of 6 VDC batteries will give you more Ah's than a regular set of 12VDC batteries, BUT in each of the catagories they have batteries rated with a lot more Ah's, but at a cost.

Some members just added a 3rd 12VDC battery for an additional 85Ah's and are happy with the results. I opted for 2 Trojan T-145 6 volt batteries (260Ah), which for my needs is fine. Just remember that if you have an 85Ah battery you really can only use 43Ah's (about the 12.0VDC mark), which is the 50% rule

If these are new batteries, and you have room for one more, you may just want to add a 3rd battery (cheaper) and when they reach the end of their lives you can upgrade to a better selection.

Don

Here is a link to my "RVing with SOLAR" community on this forum. Look for the posts regarding 6volt vs 12 volt batteries. It will give you a the (easy to understand) difference between batteries.
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Old 08-26-2015, 08:48 AM   #13
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Don is right on... I went with 3 pairs of Trojan T105's 220 ah.. for a total of 660 ah BUT if you are not boondocking it is a waste of money.. those that go from campground to campground or spend a night at Wal-mart do not need this system. We really need to know how you plan to use your RV to give you the most cost effective way to set up.
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Old 08-27-2015, 06:49 AM   #14
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Thanks

Thank you guys for the great information. We exclusively dry camp, never hook up. This has been educational, if not a bit frustrating.

I get the picture now my dual purpose Crown batteries weren't the right thing for the job.
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Old 08-27-2015, 08:29 AM   #15
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dangerdave have a read here, or a few nights reading! Lots of info to go through but sounds like you want to understand your batteries and this will help.

https://handybobsolar.wordpress.com/...ging-puzzle-2/

If you exclusively dry camp I would recommend installing one or two solar panels for battery maintenance and keep the generator if needed for running AC or the microwave. I have 300Watts of solar panels and I have never needed to plug in my trailer to charge the battery since installing them. I have actually turned off the converter so even when we are plugged in it is not charging the battery.

Solar, done right, is not that expensive and is pretty efficient! Especially living in Phoenix!
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Old 08-27-2015, 08:38 AM   #16
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Holy mackerel, that's amazing information. I will certainly digest.


I'm constantly amazed at the level of expertise people have around here.
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