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Old 01-29-2016, 07:00 PM   #1
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House Battery ?

Our new motor home has two six volt house batteries in series. why wouldn't two twelve volt deep cycle batteries in parallel give me more amp Hours? I would use Optima deep cycles and it just seems to me that would give more "juice" . I plan on putting an inverter in to run just the TV in the bedroom at night so I do not have to get up and turn the generator off.
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Old 01-29-2016, 07:19 PM   #2
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Generally, batteries of the same size (look at Group Size or perhaps weight) give the same capacity whether they are two 6 volts in series or two 12 volts in parallel. But in practice you are likely to get slightly more capacity with 6 volts in series. It depends.

If your motorhome is new and has two 6 volts in series, use them as is, they will work.
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Old 01-29-2016, 07:35 PM   #3
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IBatteries create power with the lead plates inside them.

The more lead, the more power.

Most 6 volt batteries are heavier then 12 volt of the same dimensions.

More lead, more power. Thicker lead plates, longer life.

Optima batteries have open space between the cells and are light.

When looking for HOUSE batteries compare actual Amp Hour rates, not cranking power or marketing claims.

Optima group 31 battery is quite a bit bigger then a 6 volt GC2.

The Optima is 60 lbs and 75 Amp Hours. 2 give you 150 Amp Hours.

A smaller GC2 6 volt is 64 lb and 215 Amp Hours. Two in series give you the 215 AH rating at 12 volts. And they cost less !
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Old 01-29-2016, 07:55 PM   #4
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Think the consensus is that correctly wired 6 volts bats have better performance in a repetitive deep-rechanging environment vs 12-volt bats.....
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Old 01-30-2016, 06:26 AM   #5
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Our motor home has 2 six volt batteries and a inverter. We can watch TV and use lights and a propane furnace at night and the batteries are still usually at 75% when I get up and start the generator. The propane furnace would probably pull the batteries down more in colder temperatures but with the low temperatures in the mid to upper 30s it has not been an issue.
I should add that all the lights are LEDs.
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Old 01-30-2016, 08:22 AM   #6
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The voltage has nothing to do with the amp-hours and a pair of 6v's in series is, in effect, one large 12v battery anyway. As other already stated, AH capacity is about the amount of lead plates rather than voltage.

A typical GC2 6v "golf cart" battery produces 225 AH, and a pair of them in series is the same AH but 12v. To get the same 225 AH from 12v deep cycles you would need a pair of group size 30 or 31, which are usually 105-115 AH each.

There is no advantage to changing your 6v's to 12v.
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Old 01-30-2016, 09:45 AM   #7
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GC-2's give you the lowest cost / Ah. If you do move to 12V, you should go with the true deep cycles like the Trojan 27 TMH. They will cost more than the 6V, but will hold up much better than hybrid marine batteries.
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Old 01-30-2016, 10:14 AM   #8
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There are many options for house batteries and the choice depends on two key factors.

Actual use and budget.

If one rarely boondocks and only needs "traveling power" to maintain things for a day or so then smaller net capacity is fine but off grid requires higher capacity for same loads.

If capacity needs are high and budget decent and one stays with a lead acid system there are 2 general paths both ate very good.

Flooded 6 volt batteries as these are made by the many for golf carts.

Due to this many other devices like scissor lifts use same battery as it is best bang for buck just due to it being a popular device.

The other direction is VRLA/AGM where one can get even more capacity but at a much greater cost.

Telecom and data centers both require high capacity high quality batteries but each require a slightly different use due to their design.

They too have deep cycle batteries used in ups side and not so deep cycle used in floating dc side.

One manufacturer creates a battery rated as 180 amp hour with a 10 year expected life in hostile environment with a 5 year swap warranty and it performed at better than 200 to 225 amp hours while being in the same package as the 160 amp hour unit it replaced.

Two fit in the footprint of an 8D but are 12 inches tall.

And priced north or 500 each maybe for small quantities.

Many options are out there and it just depends on your needs and budget.

Most folks do not know their loads and battery plant performance design so they get lost.

For most a pair of GC2 is all that is needed.
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Old 01-30-2016, 03:56 PM   #9
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Well said, Tony [or Lori?]
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Old 01-30-2016, 04:30 PM   #10
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I appreciate this conversation and want to say thanks.

I have two "new" 6v that have issues. Issues since PDI and I'm in discussions on replacing them under warranty when we come out of storage in late March.
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Old 01-30-2016, 04:40 PM   #11
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Quote:
Originally Posted by WDW View Post
I appreciate this conversation and want to say thanks.

I have two "new" 6v that have issues. Issues since PDI and I'm in discussions on replacing them under warranty when we come out of storage in late March.
Since you have a new MH and the MH is in storage the question might be what did you do to preserve the batteries while in storage. IE: did you have a float charge for them, periodically visit and charge them or did you disconnect them while they were Idle. Batteries can self discharge and if left unattended there may have bee some ghost current losses which drained the charge down. Batteries like being fully charged while at rest. If not you will end up with discharged, sulfated batteries.
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Old 01-30-2016, 06:03 PM   #12
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Well it all goes back to buying our new rig. When we first visited on August (it was built in April) house batteries were dead. Second visit with focused buying discussions in September and early October- dead and needs to be jumped each time to get the generator running to power the rig.

At PDI it had been plugged in and we continued it on shore power at home. I late November we put it in storage with shore power connected. No issues.

However we turned the master power switch off thinking it would be like our Jayco and keep a float charge on it. This is where we apparently went wrong.

We checked 3 weeks later and all appeared good. Our next visit early this month everything was dead. We had good shore power and no codes on our EMS.

So we did dome asking with Nate at FR and our dealer and found out FR's require the master to be on to manage a charge. OOPS.

So that's my sad story. We can't get back to the rig till next weekend. Were unsure if we should plug it back in (when we found it dead / not working we disconnected the shore power fearing the issue was with the converter)and turn the switch on against the dead batteries. If we do, we won't be able to check on the rig for at least a week. Or do we let it set idle till we come out of storage and figure out what are options are.

Suggestions and comments are welcomed!
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Old 01-30-2016, 06:12 PM   #13
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Have the dealer replace them or replace them yourself in the spring.

Since the dealer let them die numerous times, the damage is done.

They should be, and probably are aware that the batteries will not survive that kind of treatment.
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Old 01-30-2016, 09:11 PM   #14
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If a lead acid battery discharges below minimum specified voltage which industry standard is considered 1.75 volts per cell (some a little less some a little more) the battery can be damaged.

If batteries were dead at pdi the dealer should have swapped them out under warranty.

Given they were dead at pdi then work with the dealer to get warranty clock on battery either that date check to see exactly what you have and if you wish to upgrade have dealer credit the warranty value.

Every day that goes by costs you prorate on the battery unless you can get the dealer to submit the claim.
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