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Old 07-31-2021, 08:11 AM   #1
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Brand: Thor Motor Coach
Model: Quantum JM31
State: Tennessee
Posts: 162
THOR #21926
4 group 27 AGM's under the steps?????

Looking for comments from anyone who has added 2 more Group 27 batteries to the factory installed 2 Group 27's under the steps.

The brochure for our coach states the under the steps battery tray can hold four Group 27 batteries. It comes from the factory with two Group 27 AGM's and I was considering adding two more AGM's bringing the total to four. Looking at the battery tray it would seem a difficult task adding two more batteries. There are a number of cables and two circuit breakers inside that tray. The only way for batteries to go in or out is thru the opening under the top step. I looked under the coach and there does not appear to be an opening large enough for a battery to go in or out. We are guessing that the two existing batteries would have to be pushed back in the tray to make room for two more at the front. Then the cables for the two additional batteries would have to be added. Just looking at the situation we do not get a positive feeling about this. We were wondering if anyone else had done this and how it went.

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Old 07-31-2021, 11:25 AM   #2
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Brand: Thor Motor Coach
Model: Omni XG32
State: Alabama
Posts: 691
THOR #22586
Quote:
Originally Posted by Bob Nodine View Post
Looking for comments from anyone who has added 2 more Group 27 batteries to the factory installed 2 Group 27's under the steps.

The brochure for our coach states the under the steps battery tray can hold four Group 27 batteries. It comes from the factory with two Group 27 AGM's and I was considering adding two more AGM's bringing the total to four. Looking at the battery tray it would seem a difficult task adding two more batteries. There are a number of cables and two circuit breakers inside that tray. The only way for batteries to go in or out is thru the opening under the top step. I looked under the coach and there does not appear to be an opening large enough for a battery to go in or out. We are guessing that the two existing batteries would have to be pushed back in the tray to make room for two more at the front. Then the cables for the two additional batteries would have to be added. Just looking at the situation we do not get a positive feeling about this. We were wondering if anyone else had done this and how it went.
Do you have the height in the battery compartment for 6V? The Omni does and part of my purchase agreement was 2 additional 6V batteries installed. They are FLA so I periodically will have to check the water. For me it's rather easy but I did have to loosen and reposition the "flow" of the cables to to have access to the caps. If you add 2 more GP27s likely you will be using 2 more marine batteries not true deep cycles.

When my FLA batteries die, I'll replace them with 4 6V AGM. The 6V are tight in the compartment but they do fit easily.
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Old 07-31-2021, 05:56 PM   #3
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Brand: Thor Motor Coach
Model: Omni SV34
State: Colorado
Posts: 21
THOR #22921
Here are photos of four new Interstate 6V AGM batteries under the steps in our 22 Omni SV34. Tight fit for sure, but doable. Removed both factory-installed floated 6V Rocket batteries.
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Old 07-31-2021, 06:09 PM   #4
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Brand: Thor Motor Coach
Model: Vegas 24.1
State: Florida
Posts: 716
THOR #5313
Just replaced our oem batteries this morning in 2016 Vegas. I measured and could have put 29dc instead of 27dc if I move the breaker assembly at back of rack. I did not since we rarely park without being plugged in. I doubt 4 of any type would fit unless very compact.

The oem batteries will be used in boat for starting engine and trolling motor. In 5 years we have owned this is maybe 3rd time they took a little water.
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Old 08-01-2021, 10:23 AM   #5
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Brand: Thor Motor Coach
Model: Quantum JM31
State: Tennessee
Posts: 162
THOR #21926
Two replies with owners of the Omni and one reply from a Vegas owner. I am guessing the Omni may have a more substantial battery tray than our Quantum. The Quantum is a gas chassis with only a 14,500 GVWR. Looks like the Omni is higher than that and a diesel. The Vegas might have a similar battery tray. We will have to do some measuring but just looking at the size of the opening for the ingress/egress of the batteries it will be a PIA just replacing the two factory installed batteries let alone adding two more. We were just curious if anyone with the Thor touted 4 battery tray on a 14,400 GVWR had actually added two more batteries and how it was done. In our opinion 4 batteries of any type in the tray we have is stretchy.
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Old 08-01-2021, 11:19 AM   #6
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Brand: Thor Motor Coach
Model: Vegas 24.1
State: Florida
Posts: 716
THOR #5313
Sorry if I posted in wrong thread. When I heard batteries under steps, I was in process of swapping. The Vegas is on 14,500 gvwr e 450 chassis. We rarely depend of batteries other than when driving in cooler weather. The much maligned oem batteries have served us well and were replaced with walmart batteries. I had just bought a small boat and needed 2 batteries. So it was convienient to do now.

For testing of capacity purposes, we took oldest grandson up on blue ridge parkway one summer. I added a 650 watt invertef to allow him to watch tv/bluray/ ps4 while cruising in cooler weather. The battery indicator on rv would not drop from full (4 lights) for a little over 4 hours in 2016. Earlier this year was a little over 2 hours telling me it was time to consided change.

The design of battery holder would allow the slightly larger 29dc battery but I would have needed to more 12v breaker assembly and since unit has fit our needs as is. I saw little point in the effort. Cut up back of one hand putting retaining straps on as it was.
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