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Old 10-07-2016, 07:56 PM   #1
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Batteries!

I added two group J-185 batteries for unlimited (almost) dry camping. I built a unistrut frame that hangs from the coach frame so there is no weight on the storage compartment floor or walls. The coach batteries are rated at 160 minutes at 25 amps and these are rated at 420 minutes at 25 amps EACH!
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Old 10-07-2016, 08:18 PM   #2
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Nice battery!

Do You have these batteries on different charging circuits?

Don
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Old 10-07-2016, 08:22 PM   #3
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Right now they are in parallel with the house batteries and I've been charging them with a 10 amp charger. I ordered a Genius charger with a 25 amp output and will isolate the FullRivers when I use that charger.
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Old 10-07-2016, 09:40 PM   #4
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Sorry to be negative but having those drastically different batteries hooked in parallel with each other is not a good idea. Hopefully you kill the interstates and not the Fullrivers. They do look like very nice batteries!

Please just eliminate the old Interstates.
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Old 10-07-2016, 09:47 PM   #5
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Subaru, I've been an electrician for 33 years and manage projects for Boeing, Amazon, T-Mobile etc... I design and build electrical distribution systems and maybe ...just maybe I know a thing or two about what electrons do? Thanks for your unfounded negativity.
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Old 10-07-2016, 10:14 PM   #6
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Quote:
Originally Posted by Vicr View Post
Subaru, I've been an electrician for 33 years and manage projects for Boeing, Amazon, T-Mobile etc... I design and build electrical distribution systems and maybe ...just maybe I know a thing or two about what electrons do? Thanks for your unfounded negativity.
Well, I'm not an electrician and I don't know much about the distribution systems...

So, before I attempt something similar, did you do anything special?
In general, we laymen have heard that - when connecting batteries in parallel - they should be identical.

Is that incorrect?

thanks
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Old 10-08-2016, 06:05 AM   #7
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Vicr, this is a truly nice, clean installation! You indicated a future new charger, hopefully it can charge two independent battery banks. This is a good looking setup. Question, why did you not take in consideration using AGM batteries instead of the wet cell choice?
Regards, Benno

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Old 10-08-2016, 06:37 AM   #8
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Vicr, Please ignore the last question. I went on to the Fullriver site and noticed that the DC series are AGM batteries. Excellent choice, the proper rewarding way to go for deep cycle batteries in a RV!
Regards, Benno

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Old 10-08-2016, 11:00 AM   #9
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pconroy, batteries when being charged are getting voltage supplied to them. A battery doesn't care that a different battery connected to it is of a different type. The larger batteries will take a longer time to charge to capacity but if I disconnect the two battery banks and charge them separately, which is what I will do with the 25 amp charger, then both battery banks can be charged to their capacity and connected together. Any potential voltage differences will be negligable and the two battery banks will equalize.
Benno, Yes I chose the AGM's because there is no ventilation in that storage compartment.
Also, just so everyone knows the Interstate batteries were brand new when I installed the FullRivers. Sorry if I don't take criticism well but I know what I am doing and am not one to post on the internet unless I have factual information. I didn't spend $1200 on a battery installation to do it wrong!
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Old 10-08-2016, 11:04 AM   #10
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I would keep the batteries separated from each other until you split the circuits up. The following will give you some of the basics as to why. You paid good money for those batteries.

Here is a response from Optima battery (Trojan and USBattery are the same), regarding connecting batteries of different Ah in either series or parallel. The voltage will be fine, it is the characteristics of each battery that causes the problems when put together in a circuit (charging and discharging). In most cases one will overcharge or undercharge depending on the internal resistance of the individual battery. If you leave them connected eventually the newer higher Ah batteries will deteriorate to the state of the other lower Ah batteries(or older batteries). The discharge is also different for different Ah batteries. Same hold true for batteries of the same Ah rating but different dates... internal resistance is different.

You spent good money for your batteries, you will want them to last a few years (mine are on year 4... may get another couple years out of them). Never been discharged below 12.0VDC, water levels checked monthly, and the SOLAR keeps them topped off perfectly.

Don
Good luck with your project... I love the tray you built. I also enclosed the proper battery connections for series and parallel to get the most out of your batteries (of the same Ah ratings) .
Attached Thumbnails
BATTERY - Charging different Ah batteries.jpg   BATTERY - Connecting Multiple Batteries -1.jpg   BATTERY - Connecting Multiple Batteries -2.jpg   BATTERY - Connecting Multiple Batteries -3.jpg   BATTERY - Connecting Multiple Batteries -4.jpg  

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2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package

Our Solar Album http://www.jaycoowners.com/album.php?albumid=329
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