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06-05-2019, 08:05 PM
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#1
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Member
Brand: Thor Motor Coach
State: Florida
Posts: 33
THOR #15558
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Thor Fourwinds House Battery Replacement
Need to replace house battery. The old one is a FLA type and like to go with the AGM. Any recommendation or suggestions would be great. The battery housing is under the entry steps and height problem for the correct size. There is room for two batteries should I get two or just stick with the one? Suggestions on this. tks.
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06-05-2019, 08:29 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: '17-Vegas 24.1
State: California
Posts: 2,222
THOR #13362
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1) go with two batteries
2) it’s your choice for FLA or AGM.
Personally...I’m happy with my two deep cycle flooded lead acid batteries, $75-85 each at Costco or SAMs Club. Replace when needed at minimal cost.
Many on this Forum are very enthusiastic about AGM at over twice the cost.
Different strokes for different folks
One more thing...6 volts vs 12 volt batteries. If you go with two house batteries, another option you have is going with 6 volt batteries wired in Series
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'17 Vegas 24.1
Fallbrook, CA
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06-05-2019, 09:08 PM
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#3
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Member
Brand: Thor Motor Coach
State: Florida
Posts: 33
THOR #15558
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Excellent point on the cost. Will check on both the FLA and AGM. Can you cable two 12 v or does it have to be 6 if you hook them up in series. Any other specs I need to consider when selecting either FLA or AGM (voltate 6 or 12) tks again. My son works at autozone and has a discount. Might go there to purchase. Nothing special with the battery just a 12 or 6 car battery will do right. Sorry novice with batteries. tks again
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06-05-2019, 09:38 PM
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#4
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Senior Member
Brand: Still Looking
Model: Newmar London Aire
State: North Carolina
Posts: 451
THOR #14340
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Quote:
Originally Posted by frschof
Excellent point on the cost. Will check on both the FLA and AGM. Can you cable two 12 v or does it have to be 6 if you hook them up in series. Any other specs I need to consider when selecting either FLA or AGM (voltate 6 or 12) tks again. My son works at autozone and has a discount. Might go there to purchase. Nothing special with the battery just a 12 or 6 car battery will do right. Sorry novice with batteries. tks again
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Goodness gracious, we need to back up a bit. Short answer is NO, you can't just use any battery. Well you can, but the wrong type of battery won't perform correctly and won't last very long either.
If you go with FLA, it (they) need to be Deep Cycle batteries. Deep Cycle batteries are designed to be regularly deeply discharged using most of its capacity. A "starting battery" is designed to give the engine a lot of AMPs immediately, which is needed to start your engine.
Let me ask, what in the coach will be running on these battery's? Do you have an inverter too?
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06-06-2019, 01:23 AM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,883
THOR #6826
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I just replaced my house and chassis batteries. I went with flooded golf cart batteries (6v) and a sealed flooded chassis battery. I was out the door for $360 for all three batteries. You can convert from 12v to 6v but obviously you’ll need 2(or 4) of them. Golf cart batteries tend to be taller (and heavier!) than 12V so measure carefully. And if you do convert you’ll need a minor but essential rewiring. A better question is what do you use your coach for? If you do a lot of dry/boondocks camping a pair of golf cart batteries will serve you very well. If you mainly stay in parks with shore power a single 12V deep cycle might be all you need. Have you been running down your old batteries (before they got old)? AGM batteries don’t self discharge quite as quickly as flooded but you can’t ignore them either. If you are able to plug I once in a while when in storage maybe there isn’t so much advantage to AGM. And you don’t have to add water but they cost about twice as much. Personally I’m good with just replacing my flooded batteries every 3 or 4 years.
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06-06-2019, 03:09 AM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31D
State: Virginia
Posts: 137
THOR #5638
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You camping style and electrical needs are the driving factor to determine what type of battery to use. Without knowing either no one can make a reasonable recommendation.
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2006 Hurricane 31D built on a 2006 Ford F53
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06-06-2019, 03:12 AM
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#7
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Member
Brand: Thor Motor Coach
State: Florida
Posts: 33
THOR #15558
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I have a Progressive Dynamics - 12 Volt 60 Amp RV Converter / Battery Charger. I use the RV once a month mainly short trips weekends. Not 100 percent sure but the bathroom fan, lights, radio and Fridge if selected. Mostly I have the fridge on Propane.
I currently have a FLA battery installed but she is dead. THe FLA sounds like a good option I just need to maintain properly.
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06-06-2019, 12:01 PM
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#8
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Senior Member
Brand: Still Looking
Model: Newmar London Aire
State: North Carolina
Posts: 451
THOR #14340
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Battery discussions are always difficult because there are so many variables to deal with. But the "simple rules" dictate:
- buy deep cycle batteries,
- get the most AMP's possible
- for the least amount of money spent
I like AGM batteries and I use them here on my home back up system. But the batteries here at home don't get the same workout that my RV will get and the opportunity for abuse on the RV batteries is greater. FLA's cost about 1/2 what the AGM's cost, so for those reasons, I use the FLA's in my RV.
My opinion is as follows, others may/may not agree.
Shop around, find the best deal and then buy deep cycle batteries with the largest amount of AMP storage possible. (As an example, I paid about $1.30 per amp on my setup.) If you can put two of them in parallel configuration, then all the better. Two batteries in parallel configuration will give you twice the amps to draw from.
Given you have limited space and can only fit two batteries, I'd use 2-12 volt batteries in parallel configuration. If you had space for 4 batteries, I would say use 4-6 volt batteries wired as follows. 2-6 volt batteries wired in series = 12 volts. Then wire those "pairs" in parallel and you still have a 12 volt system, but with twice the amp storage.
As I said previously, this is my opinion only.
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06-06-2019, 01:34 PM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: '17-Vegas 24.1
State: California
Posts: 2,222
THOR #13362
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Well said!
Thank you for the detailed analysis
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'17 Vegas 24.1
Fallbrook, CA
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06-06-2019, 01:42 PM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,883
THOR #6826
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Also, if you store your coach without shore power for more than a few weeks at a time you might want to consider putting a total disconnect switch on your batteries. If you use just the store/use switch there is still some parasitic drain happening that will run you down more quickly. They only cost about $10 and are easy to install - especially if you’re replacing the batteries anywhere.
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06-06-2019, 03:28 PM
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#11
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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What size battery are we talking about?
24?
27?
maybe even a 31?
Definitely get deep-cycle batteries(and AGMs: if you can afford them!)
Good luck, and Happy Shopping!
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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06-06-2019, 08:03 PM
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#12
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Member
Brand: Thor Motor Coach
State: Florida
Posts: 33
THOR #15558
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Quote:
Originally Posted by Squerly
Battery discussions are always difficult because there are so many variables to deal with. But the "simple rules" dictate:
- buy deep cycle batteries,
- get the most AMP's possible
- for the least amount of money spent
I like AGM batteries and I use them here on my home back up system. But the batteries here at home don't get the same workout that my RV will get and the opportunity for abuse on the RV batteries is greater. FLA's cost about 1/2 what the AGM's cost, so for those reasons, I use the FLA's in my RV.
My opinion is as follows, others may/may not agree.
Shop around, find the best deal and then buy deep cycle batteries with the largest amount of AMP storage possible. (As an example, I paid about $1.30 per amp on my setup.) If you can put two of them in parallel configuration, then all the better. Two batteries in parallel configuration will give you twice the amps to draw from.
Given you have limited space and can only fit two batteries, I'd use 2-12 volt batteries in parallel configuration. If you had space for 4 batteries, I would say use 4-6 volt batteries wired as follows. 2-6 volt batteries wired in series = 12 volts. Then wire those "pairs" in parallel and you still have a 12 volt system, but with twice the amp storage.
As I said previously, this is my opinion only.
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Thank you very much. For example. autozone has this batter see link. It is listed as reserve capacity of 188 spec is this what you mean when you say AMP Storage?
https://www.autozone.com/miscellaneo...nal/832115_0_0
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06-06-2019, 09:05 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31D
State: Virginia
Posts: 137
THOR #5638
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Quote:
Originally Posted by frschof
I have a Progressive Dynamics - 12 Volt 60 Amp RV Converter / Battery Charger. I use the RV once a month mainly short trips weekends. Not 100 percent sure but the bathroom fan, lights, radio and Fridge if selected. Mostly I have the fridge on Propane.
I currently have a FLA battery installed but she is dead. THe FLA sounds like a good option I just need to maintain properly.
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The Progressive converter will suit your needs well. Being a multistage charger will help with keeping the batteries happy.
Besides those items listed included in the list the furnace, thermostat, water heater and water pump. Your fridge, even when burning propane, still needs 12VDC for the controller to turn the burner on and off. Same for the water heater. And even though the roof A/C runs off of 120VAC powered the thermostat that tells it the coach is hot needs DC power to make that happen. If you have slides or jacks those will also be DC powered.
With no mention of off grid, primitive or boondocking I'm going to guess full service or at least a power and water campsite is your primary go to place. Not a problem your in the majority. Considering such along with a propane fridge and no inverter your DC needs while unplugged are rather light. Basically you need to keep the fridge going during a stop in route such are grocery shopping or may be some sightseeing. Maybe a few hours for a brief rest stop or when you loading or unloading the rig.
When you boil it down to the hard numbers an inexpensive 12VDC marine/RV deep cycle will do what you need and if treated right should see you thru four plus camp seasons. Considering the location, under the entry steps, I would get a maintenance free battery. It will just make life a lot easier not having to worry about any spilled or leaking acid considering the location.
What to get? I'd go with Sam's Club Duracell Marine & RV Deep Cycle group size 27. Costco has the same but marked by Interstate Batteries. Both are about the same price at just under $90 and will suit your needs. Measure the space before you do anything.
Decide to test the boondocking waters and you really should consider going with true deep cycle 6VDC batteries rather than hybrids.
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2006 Hurricane 31D built on a 2006 Ford F53
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06-07-2019, 01:17 AM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31D
State: Virginia
Posts: 137
THOR #5638
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If you set on spending that much then just get two 6VDC GC2s with twice the storage capacity and true deep cycle and never worry about if you have enough power.
When comparing us the 20 amp hour rate number listed. Two 6VDC will get you 215 while the single 12VDC only has 110. There's a little more to it but the 20 amp hour rate is a reasonable comparison number.
More info - https://www.batterystuff.com/kb/arti...ate-mean-.html
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2006 Hurricane 31D built on a 2006 Ford F53
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06-12-2019, 04:46 PM
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#16
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Member
Brand: Thor Motor Coach
State: Florida
Posts: 33
THOR #15558
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Thank you to all
Want to thank all you responded to my question. I have learned alot and value you inputs. I picked up a 24 Marine/RV AGM series bat from Battery Source. SHe is in place and working fine (well once I charge it up) Need to take her on a road trip. Thanks again
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03-09-2021, 09:09 PM
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#17
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Junior Member
Brand: Thor Motor Coach
State: Texas
Posts: 23
THOR #794
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I am looking at replacing my flooded house batteries with AGMs and wanted to know what brands have served folks the best.
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03-09-2021, 09:32 PM
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#18
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
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I installed 4 T105 AGM's a little over two years ago
1) No cell watering
2) No Corrosion
3) No hydrogen gassing off
4) Don't loose voltage as fast when sitting for a few weeks
5) Run all night on batteries for heat and fridge plus misc
6) Handles the inverter run time on long trips and layovers to use the microwave or coffee maker without running the generator
Good batteries as any battery needs to be kept from completely discharging to prolong the useful life
I had to clean and repaint the battery compartment as well as clean the cables from the flooded batteries. I do use batteries harder than the average camper might so consider that if spending more money
Decided enough is enough
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03-09-2021, 10:45 PM
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#19
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Senior Member
Brand: Thor Motor Coach
Model: '17-Vegas 24.1
State: California
Posts: 2,222
THOR #13362
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For some of us Thor owners...
- there's not enough room to store more than two batteries, not even two T105's because of the height, unless major mods or storage space is taken
- but, I agree that AGMs are superior to Flooded Lead Acid
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'17 Vegas 24.1
Fallbrook, CA
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03-10-2021, 12:27 PM
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#20
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Junior Member
Brand: Thor Motor Coach
State: Georgia
Posts: 25
THOR #21916
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I just replaced my two group 27 flooded batteries with Duracell group 31 AGM batteries yesterday. Hoping to see some improvements with the AGM's.
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2013 Thor Hurricane 34E
2005 Jeep Wrangler TJ /LJ
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