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Old 06-13-2021, 05:48 PM   #1
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House Batteries

Hi All,

I am looking for recommendations to replace both the house and coach batteries for my Greyhawk.

I have already decided to replace with AGM's over FLA's for ease of maintenance.

I only have 1 house battery currently: Harris 27d170. Has RC of 160 min @25amps. It is 12V. Is it better (assuming there is enough room) to replace with two 6V in series?

Chassis Battery is MotorCraft BXT-65-650. 650CCA

Thanks for your time and knowledge.
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Old 06-13-2021, 05:54 PM   #2
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Quote:
Originally Posted by shovlpushr View Post
Hi All,

I only have 1 house battery currently: Harris 27d170. Has RC of 160 min @25amps. It is 12V. Is it better (assuming there is enough room) to replace with two 6V in series?
Your battery is not true Deep Cycle battery. It is a Marine/RV Deep Cycle which is actually a dual purpose engine starting and light trailer battery. This starting a small outboard or powering the lights/brakes on a small utility trailer. Deep Cycle batteries are rated at 65, 80, 100 amp hours based on the battery size not the minutes. Engine starting batteries are listed by the amp for x number of minutes and "cold cranking amps" CCA.

You need to determine how much room you have in your house battery compartment. The gold standard would be 2-100aH 12v Deep Cycle Group 31 batteries wired in Parallel.

6V AGMs and harder to come by and much more costly. Keep in mind that 6v batteries are taller and they weigh more, too. Most folks that can fit 6V batteries buy flooded for less money. These, of course, are wired in Series.
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Old 06-13-2021, 06:18 PM   #3
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I'm a big fan of AGM and willing to pay the premium for no maintenance or compartment corrosion.
Duracell AGMs made by East Penn are available at Sams Club and other retailers and are very reasonably priced for a quality battery. You can buy better but at 1.5X or 2X the price I doubt they will have a better payback.
Duracell AGM are available in 6V GC and 12V GP31 with a pair providing very similar AHs. The advantage with GP 31s is that if/when one goes bad you can disconnect and run on one until you can replace them. With 6V you need both to get 12V.
East Penn has confirmed that both are comparable for deep cycle application and is the reason their AGMs will state both AH and CCA as they work in both applications. Unlike FLA where plate designs differ for deep cycle and starting applications, AGMs are a different animal and have similar plate / separator designs.
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Old 06-14-2021, 12:09 PM   #4
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That is where I am confused.

1) How do you determine what Group is required?
2) Would a "true" deep cycle battery be able to provide the auxiliary boost to the engine start with out damage.
3) How can I tell if the current charging setup would handle an AGM / deep cycle or should I budget that cost as well when buying? Would it be a better option to replace with another "dual purpose" type battery instead of the hassle and additional cost of replacing the charger.

Bought RV used and not sure I have all the docs on what is installed or how it works.

Thanks
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Old 06-14-2021, 12:22 PM   #5
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The Group indicates the physical size of the battery. This of course is what you use to determine what will fit in your battery compartment.

Group 24 Batteries 10.25 x 6.8125 x 8.875 inches (wide X deep X tall)
Group 27 Batteries 12.0625 x 6.8125 x 8.875 inches
Group 31 Batteries 13 x 6.8125 x 9.4375 inches

And, batteries are just made up of individual cells. So, a bigger case allows for more cells which means more amp hours. For instance the Group 24 is usually around 65aH, the Group 27 is around 80aH and the Group 31 is around 100aH. Those are not hard and fast numbers. It varies by manufacturer.

Yes, true deep cycles can be used with the "boost" switch without issue.

You need to find out the model number of your Converter/Charger and look at it's specs. In GENERAL, any FLA charger can be used with AGMs. A more modern converter would have specific FLA and AGM profiles. But the two are very similar.
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Old 06-15-2021, 05:32 AM   #6
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For flooded battys the 6V GC (golf cart) battys are a relatively inexpensive true deep cycle batty but you need 2 hooked in series to get 12V. They are not much larger than a GP 24? But are taller which is a limiting factor in some applications. They will list AHs but not CCA as they are considered a deep cycle batty. They will start many engines in an emergy w/o issue but not the best use long term.
If going to AGM many (East Penn, Duracell, etc) will list both AHs and CCA as they will provide both applications well.
What you need to determine is what CCA is needed / recommended for your starting needs and how many AHs you consume for house needs as well as how and how often you will / can recharge. Then look at what group size batty satisfies your needs.
RVs are different than autos where the mfg usually states the batty group / size required as often thats the size that will fit in the designed spot.
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Old 06-15-2021, 07:38 PM   #7
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Quote:
Originally Posted by shovlpushr View Post
That is where I am confused.

1) How do you determine what Group is required?
2) Would a "true" deep cycle battery be able to provide the auxiliary boost to the engine start with out damage.
3) How can I tell if the current charging setup would handle an AGM / deep cycle or should I budget that cost as well when buying? Would it be a better option to replace with another "dual purpose" type battery instead of the hassle and additional cost of replacing the charger.

Bought RV used and not sure I have all the docs on what is installed or how it works.

Thanks
Just as a bit more information - if your RV can take size Group 31 12V batteries and if you prefer AGM batteries for ease of maintenance - then here are a couple of Group 31 12V batteries with the highest storage capacity:

1. These are what I use two-of and their capacity is 115 amp hours each -
https://www.fullriverbattery.com/product/dc115-12/

2. These are the ultimate capacity 12V AGM batteries in Group 31 size, at 125 amp hours each - https://lifelinebatteries.com/produc...ries/gpl-31xt/

The above two battery products are expensive, but represent about the best of the best in Group 31 AGM reliability and capacity.
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Old 06-15-2021, 07:46 PM   #8
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I replaced mine with two AGM from Battery Supply. Expensive but good.
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Old 06-15-2021, 11:37 PM   #9
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You can spend $79-$120 to replace a RV/ Marine, or $200-$400 for a pair of 6-volt deep cycle, or $1,000 for Lithium-Ion; If you PLAN to stay plugged in at CG, the RV/Marine is all you need, and will still let you Roadside 4-7 Hours in 25-degree weather before cranking GEN (maybe w/ BOOST Switch?) YOU decide.. learn your rig/ needs/ experiment if needed?
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