Go Back   Thor Forums > Thor Tech Forums > Modifications and Updates
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 09-14-2017, 07:29 PM   #1
Junior Member
 
Brand: Still Looking
State: Iowa
Posts: 15
Adding extra coach betteries

Anyone added extra coach batteries? I'd like to add 2 more andhadhoped to do it right by the others but the exh is too close. Has anyone else added some? If so where.

I'm a welder fabricator, itlools likebehind the axle on the frame is best.

Thanks jeff.
__________________

Jeff From Iowa 33sw is offline   Reply With Quote
Old 09-14-2017, 08:01 PM   #2
Senior Member
 
Mike in AZ's Avatar
 
Brand: Thor Motor Coach
Model: Challenger 37LX
State: Arizona
Posts: 354
Quote:
Originally Posted by Jeff From Iowa 33sw View Post
Anyone added extra coach batteries? I'd like to add 2 more andhadhoped to do it right by the others but the exh is too close. Has anyone else added some? If so where.

I'm a welder fabricator, itlools likebehind the axle on the frame is best.

Thanks jeff.
Your profile says "still looking," what model and year coach are you asking about?
__________________

__________________
__________
Mike
USAF Veteran, Retired Security Professional
The only thing necessary for evil to prosper,
Is that good men do nothing.
Mike in AZ is offline   Reply With Quote
Old 09-14-2017, 08:15 PM   #3
Senior Member
 
Bob Denman's Avatar
 
Brand: Thor Motor Coach
Model: Outlaw 29H
State: New York
Posts: 1,450
Perhaps the "looking part" is over...
What'd you buy???
__________________
Good Sam Member 843599689
FMCA Member F473304
Bob Denman is offline   Reply With Quote
Old 09-14-2017, 08:21 PM   #4
Junior Member
 
Brand: Still Looking
State: Iowa
Posts: 15
My model is in my user name.
Jeff From Iowa 33sw is offline   Reply With Quote
Old 09-14-2017, 08:55 PM   #5
Senior Member
 
Brand: Thor Motor Coach
Model: 2016 Quantum WS31
State: Washington
Posts: 251
From looking at your floor plan it is very similar to myWS31. Are your batteries under the second step? My battery box will fit 4 batteries. But, 6v units are really close on height.
99dart is offline   Reply With Quote
Old 09-14-2017, 08:59 PM   #6
Junior Member
 
Brand: Still Looking
State: Iowa
Posts: 15
I can only fit the two. There. I have f 550 chassis w a diesel.
Jeff From Iowa 33sw is offline   Reply With Quote
Old 09-14-2017, 09:02 PM   #7
Senior Member
 
Brand: Thor Motor Coach
Model: 2016 Quantum WS31
State: Washington
Posts: 251
Ah, OK. Being a fabricator, I'll bet you come up with a good solution.
99dart is offline   Reply With Quote
Old 09-14-2017, 11:10 PM   #8
Junior Member
 
Brand: Still Looking
State: Iowa
Posts: 15
Yes install is not a issue was hoping people would chime in about how many they added etc. I have residential fridge. It will not make 12 hours with two big batteries.
Jeff From Iowa 33sw is offline   Reply With Quote
Old 09-14-2017, 11:43 PM   #9
Senior Member
 
Brand: Thor Motor Coach
Model: 2016 Quantum WS31
State: Washington
Posts: 251
I'm in the same boat with you there! I have already done the fitting and wiring adjustments to install 2 more 6v batteries in mine. I hope 4 will be enough until I can install some solar support to the charging system.
99dart is offline   Reply With Quote
Old 09-14-2017, 11:43 PM   #10
Junior Member
 
Brand: Still Looking
State: Iowa
Posts: 15
That's a good idea. My rig had solar and someone removed it.
Jeff From Iowa 33sw is offline   Reply With Quote
Old 09-15-2017, 02:26 AM   #11
Junior Member
 
Brand: Still Looking
State: Iowa
Posts: 15
Why are you messing with 6 volt batteries?

2-12 in parallel is what they install. You still only see 12 volts but have more reserve time.
Jeff From Iowa 33sw is offline   Reply With Quote
Old 09-15-2017, 11:23 AM   #12
gmc
Senior Member
 
gmc's Avatar
 
Brand: Thor Motor Coach
Model: Hurricane 32A
State: Florida
Posts: 1,271
Quote:
Originally Posted by Jeff From Iowa 33sw View Post
Why are you messing with 6 volt batteries?

2-12 in parallel is what they install. You still only see 12 volts but have more reserve time.
Actually many use two 6 volt batteries in series... Or four in series/parallel... In all cases providing 12v to the coach.

6v batteries tend to be more 'energy dense' and can provide more capacity in the same space.

Making the assumption that what is installed by factory is best option is probably not valid in MANY cases.... Batteries, power converters, TV's, etc all come to mind...

Some rigs do come with 6v batteries too.
__________________
Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
gmc is offline   Reply With Quote
Old 09-15-2017, 02:07 PM   #13
Junior Member
 
Brand: Still Looking
State: Iowa
Posts: 15
Hmm mine has six volt. I don't see reserve capacity on them.

What's the reserve capacity for your 6v?

I'd be willing to bet I can gain a lot by removing the 6v and installing my two 12volt agm 155 reserve minute batteries.
Jeff From Iowa 33sw is offline   Reply With Quote
Old 09-15-2017, 02:31 PM   #14
Senior Member
 
TyCreek's Avatar
 
Brand: Thor Motor Coach
Model: Axis 24.2
State: Idaho
Posts: 435
If you're adding batteries to existing storage, any mismatch is less than optimal for long cycle life. Best is when all batteries are matched. Even the same batteries are not matched when part of the array is aged. The good news is parallel connections are more tolerant for mismatch.

Since you have a new coach, your batteries "might" be ok. I say might because sales lots can be really hard on batteries and age them early. Assuming your factory batteries are 95% or better, the best option for "adding" batteries is to get the same batteries to put in parallel.

Consider your interconnect cable lengths and how they affect your charge/discharge cycles. Matched batteries can become very unmatched due to long cable run losses.

One way to increase capacity is by going to a denser power chemistry and drop in replacements are becoming more available. The LiFePo4 drop-in options provide a much better DOD and eliminates the importance of 3 stage charging. DOD is depth of discharge and that means you get to use more of the battery's capacity without degradation (think near 90% vs. 50% for FLA). Really the only downside is the initial sticker price! Long term however they could very well be cheaper YMMV.
__________________
Axis 24.2 "was" tug'n a JK
TyCreek is online now   Reply With Quote
Old 09-15-2017, 02:34 PM   #15
Senior Member
 
jpmihalk's Avatar
 
Brand: Thor Motor Coach
Model: Hurricane 35C
State: South Dakota
Posts: 520
We added 2 more 12V batteries for a total of 4, then upgraded to AGM batteries for the additional reserve capacity plus more flexible charging and zero maintenance. We also have 400W of solar panels to keep those batteries charged during daylight hours. Our Hurricane already had the space in the battery compartment for 4, so I can't speak to creating trays, etc. for adding batteries.
__________________
John & Kerri
2016 Thor Hurricane 35C with our pups MacDuff, Piper and Annabelle
2017 Jeep Cherokee toad
FMCA - F457085
jpmihalk is offline   Reply With Quote
Old 09-15-2017, 02:36 PM   #16
Senior Member
 
Brand: Thor Motor Coach
Model: 2016 Quantum WS31
State: Washington
Posts: 251
I have learned from reading here that you want the highest Amp Hours per battery. Two six volt in series create more amp hours than two 12v in parallel. (I hope I said that right)
99dart is offline   Reply With Quote
Old 09-15-2017, 02:38 PM   #17
Senior Member
 
Mike in AZ's Avatar
 
Brand: Thor Motor Coach
Model: Challenger 37LX
State: Arizona
Posts: 354
Quote:
Originally Posted by Jeff From Iowa 33sw View Post
My model is in my user name.
Oh, sorry, duh!
__________________
__________
Mike
USAF Veteran, Retired Security Professional
The only thing necessary for evil to prosper,
Is that good men do nothing.
Mike in AZ is offline   Reply With Quote
Old 09-15-2017, 02:52 PM   #18
Senior Member
 
Tfryman's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 722
Quote:
Originally Posted by Jeff From Iowa 33sw View Post
Hmm mine has six volt. I don't see reserve capacity on them.

What's the reserve capacity for your 6v?

I'd be willing to bet I can gain a lot by removing the 6v and installing my two 12volt agm 155 reserve minute batteries.
"Reserve minute" is an inaccurate rating. You need to know the capacity of the battery in Amp-Hours, normally rated at 20 amps.

And given the same chemistry and physical size, two 6 volt batteries in series normally has a larger capacity than two 12 volt batteries in parallel.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
Tfryman is offline   Reply With Quote
Old 11-18-2017, 04:48 PM   #19
Member
 
wenzOmatic's Avatar
 
Brand: Thor Motor Coach
Model: Chateau 35SD
State: Oklahoma
Posts: 71
Quote:
Originally Posted by Jeff From Iowa 33sw View Post
Hmm mine has six volt. I don't see reserve capacity on them.

What's the reserve capacity for your 6v?

I'd be willing to bet I can gain a lot by removing the 6v and installing my two 12volt agm 155 reserve minute batteries.


On the interstate page for RVs they list the 12v as 220 Amps and the 6v as 447 Amps. My battery box is 27 1/2 x 14 1/2 looks like it would take 4, 12vdc (840 total) batteries if turned sideways or 2, 6vdc (894 total).

Looks like the 6vdc would beat out the 4 12 vdc batteries.

What am I missing?

wenz
wenzOmatic is offline   Reply With Quote
Old 11-18-2017, 05:34 PM   #20
Senior Member
 
Brand: Still Looking
State: Texas
Posts: 2,535
Quote:
Originally Posted by 99dart View Post
I have learned from reading here that you want the highest Amp Hours per battery. Two six volt in series create more amp hours than two 12v in parallel. (I hope I said that right)

It's not that simple because Amp-hours IS NOT a measure of energy.

For example, 100 Amp-hours at 6 Volts is only half the "energy" as 100 Amp-hours at 12 Volts. And if we used a 48-Volt system like in many residential solar applications (and auto future) the difference (error) is even greater.

The best way to actually simplify these calculations is to use units of measure for energy, which for batteries is normally kWh (kilowatt-hour). That's how electric cars are rated because Amp-hours would be useless without also knowing voltage. RVs are "usually" 12 volt systems, but even that confuses a lot of people because batteries can be 6- or 12-Volt.

When you look at actual energy storage capacity of batteries, assuming same chemistry and battery weight, there is very little difference between 6- and 12-Volt batteries.

There is usually a "slight" advantage for the 6-Volt over 12-Volt because each cell is larger, requiring a little less packaging per pound of battery. If we only cared about maximizing Amp-hours per battery, we'd go to 2-Volt batteries.
__________________

Chance 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 Campgrounds

Reviews provided by



ThorForums.com is not in any way associated with Thor Industries or its associated RV manufacturing divisions.


All times are GMT. The time now is 02:48 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2