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Old 05-17-2015, 11:46 AM   #1
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Question House Battery Upgrade - Where to put 'em??

Hi all! We're getting ready to upgrade our house battery setup (adding a nice pure sine inverter, etc).

We're in a 2003 Fleetwood Flair 33R. It has the stock pair of 6V batteries. They're doing fine for now, but getting a little old. Since we're about to add the inverter, it's a great time to go ahead and replace them, but we're wanting to REALLY beef up our boondocking power at the same time (TX and FL in the heat of Summer means AC at night!).

I'm still running the math to see how much juice we'll need, but running an AC unit, computers (desktops in some cases), and keeping up with our geeky TV shows will have a draw. May end up popping 6 6V batteries in to cover it.

That being said, the Flair's stock batteries are under the hood, so we'll definitely have to relocate. Any opinions on the best place to put the new bank? Storage compartments are reasonably roomy, so not sure we would "have" to use a sliding tray...

Thanks for any insight!
Chris
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Old 05-17-2015, 12:44 PM   #2
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I have 8, 6 volt batteries in my boat and don't run my AC.

With my bank, I could only run it about 4 hours, and its a 8000 btu unit. After 4 hours, the batteries would be so low, that they would need to be charged, before using them for the refrigerator or TV.

Air conditioning, on batteries, is a tough thing to do.

There are some posters who say they can, but haven't. I have and can't.

Good luck
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Old 05-17-2015, 01:43 PM   #3
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I have the pair of 6v batteries in the original placement under the steps. Plus an added pair in a storage compartment. Heavy gauge wire interconnects. If maintenance access is a problem as it was for me, install a watering system.
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Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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Old 05-17-2015, 04:29 PM   #4
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Unless I have done the math wrong which has happened before. If your AC unit pulls 15 amps on 120 VAC then it will pull at least 150 amps on 12vdc. ( actual amounts are depending on line losses, inverter efficiency etc) If you have a pair of 6 volt batteries that are 230 amp hour per battery, you still only have 230 amp hours per pair. so basically each 6 volt pair will only run your AC for about 1.5 hours. That is only if you run just the ac, any other 120vac appliance that is run will take off time from the 1.5 hours. If you get 3 sets of 6 volt pairs ( 6 batteries) That will only run one AC for about 4.5 hours. That is considering the batteries will stay at 12 volt output for the whole 230 amp hours. I am thinking the output will drop off to the point where the inverter will not be able to produce 120vac before you get to the maximum amp hours for the battery. But in a perfect world you 3 pairs of 6 volt batteries will only get you about 4.5 hours of AC with one AC unit running.
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Old 05-17-2015, 04:32 PM   #5
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Unless I have done the math wrong which has happened before. If your AC unit pulls 15 amps on 120 VAC then it will pull at least 150 amps on 12vdc. ( actual amounts are depending on line losses, inverter efficiency etc) If you have a pair of 6 volt batteries that are 230 amp hour per battery, you still only have 230 amp hours per pair. so basically each 6 volt pair will only run your AC for about 1.5 hours. That is only if you run just the ac, any other 120vac appliance that is run will take off time from the 1.5 hours. If you get 3 sets of 6 volt pairs ( 6 batteries) That will only run one AC for about 4.5 hours. That is considering the batteries will stay at 12 volt output for the whole 230 amp hours. I am thinking the output will drop off to the point where the inverter will not be able to produce 120vac before you get to the maximum amp hours for the battery. This is assuming the AC is running for the entire time. Depending on how hot it is and how well your coach is insulated etc will affect how long it will run. On a hot night with a lot of time on the AC you will be close to the 4.5 hours I mentioned.
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Old 05-17-2015, 05:35 PM   #6
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You can't run AC on batteries. You would need a trailer full of batteries to run 15,000 btu of AC overnight.

Better look at a generator instead.
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