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Old 12-14-2011, 02:00 AM   #1
alansills
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<h6 ="uiStreamMessage" -ft="&quot;&quot;:1">I

am full timing in a Crossroads Seville 35RL, I need the right batteries

for it to winter camp (dry camp) for 1-2 days at a time. I do not have a

generator. It appears the best solution is 2 - 6 volt "golf cart" style

batteries in series...is this correct? I also had someone suggest a 12v

GEL battery. What say you? I'm in the NORTH and plan to head into the

MOUNTAINS for part of Jan and Feb. (Yeah, I know I'm nuts!)

Thanks in advance for your thoughts and ideas, Al
</span></h6>



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Old 12-14-2011, 03:38 AM   #2
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AL:
I don't think two 6 volt golf cart batteries will be enough to get you thru 2 nights of winter camping. The fan on your furnace draws to many amps for the batteries to hold up. You should have some means of rejuvenating the batteries every day. Without solar panels or some other way of charging, I believe a generator is a must for that situation.




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Old 12-14-2011, 05:10 AM   #3
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I agree with Old Farmer. I use the 2-6 volt setup for hunting and the furnace fan drains the batteries pretty quick (and I'm only in upper 20s for lows). I use the generator to recharge them in the evening before going to bed each night. They might make it the two nights, but they would be pretty much wiped out. I have the heat shut off during the day to conserve as much energy as possible. Even if it is a small generator, it would help recharge them.
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Old 12-14-2011, 08:58 AM   #4
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I agree with the two previous opinions. However, a few hours running a generator to charge batteries via a converter is probably equal to 15 minutes running your vehicle engine if you are hooked up to charge the camper batteries from the truck alternator. If that's your case, you might get away with it by idling the truck for a short time.
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Old 12-15-2011, 03:42 AM   #5
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My furnace fan uses 6.70 amps while running. You should be able to calc how long it can run to drain your batteries down to 50%. Will also need to calc all other battery drains.
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Old 12-15-2011, 05:37 AM   #6
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I have a suburban furnace. According to their chart, it draws 8.5 amps. (20,000--30,000 BTUH Input)
When you get to the 35,000 BTU it raises to 9.4 amps
The 40,000 BTU unit takes 11.5 amps

It has always been my understanding, when your battery/batteries reach 50% they are pretty well discharged. I never let mine get that low. Those Trojans cost to much money.




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Old 12-15-2011, 05:47 AM   #7
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Thanks, i'm still searching for the info I need. Even 1 night would be good... since if I do dry-camp, i'm likely "on the move" and would be driving the next day...and then the system would charge. So, effectively making it 1 night is ok. The problem is the series 24 battery they gave me is obviously not sufficient... so, of all the solutions proposed, i'm leaning towards 2 AGM 6v batteries and I'm not ruling out a solar panel system.

Keep the ideas coming...




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Old 12-15-2011, 06:07 AM   #8
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I can understand what you are going thru with this. BUT____
The old saying keeps running thru my mind--there ain't no free lunch.





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Old 12-15-2011, 07:05 AM   #9
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I'm not looking for a free lunch; i'm looking for the best solution - my needs are to have heat for at least 1 night on the road running the batteries. Its a Seville 35RL... all i'll run is the furnace... can i make it with 2 golf cart batteries? I'm prepared to get Trojan or Odyssey if necessary. I'm not prepared to add more "stuff" just at the moment - will the batteries do the job?

Al




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Old 12-15-2011, 09:09 AM   #10
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Nobody said you were looking for a free lunch.



Go to http://en.wikipedia.org/wiki/Peukert%27s_Law and down at the bottom click on the link to Gibsons Excel spreadsheet for calculating usage.



A 200AH battery (20 hour rating) when discharged at a 15A rate will last 11.81 hours. 10A will go 20 hours. It doesn't say if that's fully discharged or half.



Now how much current do you want to draw and for how long? From that you can calculate the battery size needed. I would suggest putting an ammeter in line and measure the actual draw with normal operation as you plan it.



I would guess and say based on the heater drawing 6.7A max but not on all the time plus the current for the fridge (even on propane it needs current to light the gas) plus a couple of lights you could go at least one night (12 hours) on a 200AH battery setup. If you drive your vehicle every day and it's setup to charge the batteries you should be OK. All of that is a guess.
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