Jayco RV Owners Forum
 


Reply
 
Thread Tools Display Modes
 
Old 05-02-2016, 12:46 PM   #1
Senior Member
 
Boudreaux's Avatar
 
Join Date: Feb 2016
Location: Lafayette, LA
Posts: 211
THE Difference in Group 27 and Group 31 batteries

Reaching out to those with the experience.

I was always under the impression that the difference between group 27 and group 31 batteries would the physical size and possibly a little more power in reserve.

I read that my Grey Hawk 29MV is designed to handle group 27 batteries.

Because I'm interested in 12 volt batteries with more Amp Hours, I have looked at some Group 31 AGM batteries as well as AGM group 27 batteries.

So .... in those two groups, wouldn't 12 volt be 12volt, and either one would serve my coach fairly...???

Is the coach listed for group 27 because of a concern over the coach's effective charging ability of the group 31 batteries...??? Can my coach effectively charge 3 group 31 AGM batteries ...???


__________________

__________________
Wilson Boudreaux
From Cajun Country
Jayco 2016 Grey Hawk 29MV Champagne
Toad - '16 Subaru Forester (Pearl White - manual transmission)
Blue Ox (everything) for the TOAD
Boudreaux is offline   Reply With Quote
Old 05-02-2016, 01:05 PM   #2
Senior Member
 
Edd505's Avatar
 
Join Date: Apr 2015
Location: Elephant Butte, NM
Posts: 1,190
31's will be larger and would need new boxes. From the post I assume you are looking for more amp hours. If that is the case I would look into 2 6V deep cycles, 6V-GEL | Trojan Battery Company
__________________

__________________
2017 Durango G353KRT 2006 F350SD 6.0 LB Crew
2000 F250SD SRW 7.3 LB Extended Cab Air Bags
2014 Eagle 30.5BHLT (sold)
2007 Layton 245LF (sold)

Learn from others mistakes, you'll never live long enough to make them all yourself. Eleanor Roosevelt
Edd505 is offline   Reply With Quote
Old 05-02-2016, 01:16 PM   #3
Senior Member
 
Boudreaux's Avatar
 
Join Date: Feb 2016
Location: Lafayette, LA
Posts: 211
I have looked at the 6 Volt batteries connected in series to give me 12 volts. I have noticed that two 6 volt batteries rated at 150 AH each will still only give me 150 AH total. (I don't understand were those extra AH are lost)

While two 12 volt batteries with 100 AH each connected in parallel will give me 200 AH.

I feel that my issue is group 27 or group 31. Can my coach handle group 31....???

Thanks for your post.....
__________________
Wilson Boudreaux
From Cajun Country
Jayco 2016 Grey Hawk 29MV Champagne
Toad - '16 Subaru Forester (Pearl White - manual transmission)
Blue Ox (everything) for the TOAD
Boudreaux is offline   Reply With Quote
Old 05-02-2016, 08:59 PM   #4
Senior Member
 
Edd505's Avatar
 
Join Date: Apr 2015
Location: Elephant Butte, NM
Posts: 1,190
I'm not a battery expert but my understanding is the 6V can be drawn down lower than the 12V with out damaging them. There are some RV techs here on the board and hopefully one will chime in.
__________________
2017 Durango G353KRT 2006 F350SD 6.0 LB Crew
2000 F250SD SRW 7.3 LB Extended Cab Air Bags
2014 Eagle 30.5BHLT (sold)
2007 Layton 245LF (sold)

Learn from others mistakes, you'll never live long enough to make them all yourself. Eleanor Roosevelt
Edd505 is offline   Reply With Quote
Old 05-02-2016, 09:16 PM   #5
Senior Member
 
Join Date: Dec 2011
Location: Upperco, Md.
Posts: 802
Quote:
Originally Posted by Edd505 View Post
I'm not a battery expert but my understanding is the 6V can be drawn down lower than the 12V with out damaging them. There are some RV techs here on the board and hopefully one will chime in.
Wet cell batteries either 6 volt or 12 volt fall under the 50% rule. Meaning that you will drastically shorten there life if you draw them lower then 12.0 volts. There is no difference in life or power in 6 or 12 volt batteries if they are true deep cycle batteries. Prices tend to be better if you can use 2- 6 volt golf cart batteries. Sams Club or Costco both offer golf cart batteries which give you a better price for the amp hours that you are buying. The problem is that they are taller and a lot of battery boxes don't have the room for 6 volt batteries without major changes in your battery storage area.
Ela1948 is offline   Reply With Quote
Old 05-02-2016, 09:33 PM   #6
Senior Member
 
Join Date: Dec 2011
Location: Upperco, Md.
Posts: 802
Quote:
Originally Posted by Boudreaux View Post
I have looked at the 6 Volt batteries connected in series to give me 12 volts. I have noticed that two 6 volt batteries rated at 150 AH each will still only give me 150 AH total. (I don't understand were those extra AH are lost)

While two 12 volt batteries with 100 AH each connected in parallel will give me 200 AH.

I feel that my issue is group 27 or group 31. Can my coach handle group 31....???

Thanks for your post.....
Your system is 12 volt!! It takes two 6 volt batteries to get you to 12 volts. Your 150 AH is only 6 volts. It takes two 6 volt batteries in series to get you 12 volts. Which is why you have only 150 AH when two 6 volts are connected in series. In series, you have doubled your voltage but not your amperage.

Your size of your battery box is your only limitation on what size battery you use. My 5th wheel came with two group 24 batteries. I replaced them with two group 31's. My gross had been 160Ah with the 24's. My AH was increased to 260 with the deep cycle group 31's.
Ela1948 is offline   Reply With Quote
Old 05-02-2016, 10:13 PM   #7
Senior Member
 
Mustang65's Avatar
 
Join Date: Nov 2012
Location: Clearwater, FL area
Posts: 3,671
As Ela1948 mentioned, you do not let your batteries drop below the 12.0 volt point, but you also need to know that you can only use 50% of the batteries rated Ah. If your battery is rated at 100Ah, you only have 50Ah that you can use... 50% rule.. You will notice that when your battery discharges to the 12.0 voltage, that is also the 50% Ah point.

So, you need to figure out how much power you need when just running on batteries, then you can figure out the Ah rating you will need. Also, you need a way to charge those batteries if you are dry-camping...

Don
__________________
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 https://www.jaycoowners.com/album.php?albumid=329
Mustang65 is offline   Reply With Quote
Old 05-02-2016, 10:39 PM   #8
Senior Member
 
hoppers4's Avatar
 
Join Date: Mar 2015
Location: Port Orchard
Posts: 1,165
Additional 12V battery

Just for reference, SteveWB from this forum added an additional 12VDC battery to his 2015 29MV by adding it in the compartment aft of the existing battery box. This was his cost to have that added.

- Add one SRM29 battery to house system - install in compartment just behind existing battery box Reinforce compartment, wire battery in and install vent.
Labor Hours - Add one SRM29 battery to house system - install in compartment just behind existing battery box. Reinforce compartment, wire battery in and install vent $297.00
Metal materials $60.00
SRM29 Battery $154.95
Electrical parts (Cable, cable ends, heat shrink) $30.00
51301 Vent unit $2.69
Electrical parts $30.00

So almost $600 for one additional battery. This just for a heads up on what it may cost you. Unless of course you do the work yourself which would save you a ton of money. He didn't change out the converter.

AGM batteries have different charging requirements so you may have to modify or replace the converter if you go that route.
__________________
Don
hoppers4 is offline   Reply With Quote
Old 05-03-2016, 01:04 PM   #9
Senior Member
 
troutslayer's Avatar
 
Join Date: Dec 2012
Location: NW AR (God's Country)
Posts: 1,846
Quote:
Originally Posted by Boudreaux View Post
Reaching out to those with the experience.

I was always under the impression that the difference between group 27 and group 31 batteries would the physical size and possibly a little more power in reserve.

I read that my Grey Hawk 29MV is designed to handle group 27 batteries.

Because I'm interested in 12 volt batteries with more Amp Hours, I have looked at some Group 31 AGM batteries as well as AGM group 27 batteries.

So .... in those two groups, wouldn't 12 volt be 12volt, and either one would serve my coach fairly...???

Is the coach listed for group 27 because of a concern over the coach's effective charging ability of the group 31 batteries...??? Can my coach effectively charge 3 group 31 AGM batteries ...???


I read that the opposite way (call me crazy). I read it like a group 24 battery WOULD NOT BE enough. Therefor, you need to have a Group 27 or higher battery.
__________________
Skip

2012 Eagle Super Lite HT 26.5RKS
2005 GMC 2500 SLT HD D/A
troutslayer is offline   Reply With Quote
Old 05-03-2016, 01:32 PM   #10
Senior Member
 
Mustang65's Avatar
 
Join Date: Nov 2012
Location: Clearwater, FL area
Posts: 3,671
Quote:
Originally Posted by Boudreaux View Post
Can my coach handle group 31....???
Can you check to see the make/mfr/model of your charge controller is...

Need this information to do the calculations

Don
__________________

__________________
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 https://www.jaycoowners.com/album.php?albumid=329
Mustang65 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Virginia State Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -6. The time now is 02:42 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2002-2016 Social Knowledge, LLC All Rights Reserved.