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Old 03-27-2012, 04:54 AM   #1
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x17z and stock Interstate battery

Any opinions on how long (nights of dry camping) one could expect with this set up... limited shower, furnace etc. Taking all things into consideration.. keeping lights to a min and all good battery saving techniques... could we expect 3 nights?

Battery is an SRM 24
group 24 12v Deep cycle
140ah
New, fully changed by an outboard deep cycle capable charger.

Down the road I do see myself going to two T105s and LEDs but thinks likely next year
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Old 03-27-2012, 06:43 AM   #2
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It's hard to say how long it will last but there are calculators out there that will help you estimate this somewhat closely. Pick up a Kill-a-Watt (I paid $19 off of Amazon) and you can measure the actual power draw on small appliances, gadgets, TV, and other things you might use then plug those numbers into the calculator and viola.

http://www.amazon.com/P3-Internation...656c7064757-20

Your long term plan sounds like the way to go to maximize your time on the battery bank.
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Old 03-27-2012, 07:30 PM   #3
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We have a 17. We went solar and love it. Check out my old posts to get an idea what we did.
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Old 03-27-2012, 07:57 PM   #4
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dddire - your battery does not have 140 amp hours. That is the reserve capacity for cranking (starting). The battery is rated for 84 amp hours. At most you want to use 1/2 of this so consider 40 amp hours the maximum you want to use before recharging. Discharging these batteries below 50% can significantly reduce the life expectancy of the battery.

Although it states this is a deep cycle it is not truly one. Real deep cycle do not have a CCA(cold cranking amps) rating. You might consider getting a 2nd battery of the same specs. Wired together - needs to be done properly so investigate - you will have 80 amp hours of power. To provide context on how much this is the Jayco manual states running the fridge and furnace on 12vDC continuously would use 75 amp hours of power.

Battery usage can be confusing so do not hesitate to ask questions.

Dan in NY
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Old 03-27-2012, 09:09 PM   #5
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To provide context on how much this is the Jayco manual states running the fridge and furnace on 12vDC continuously would use 75 amp hours of power.

Battery usage can be confusing so do not hesitate to ask questions.

Dan in NY[/QUOTE]

Interesting, so how would one convert this to continuous running time?
I realize the fridge and furnace won't run continuously but it would give me an idea of how little I might expect from this battery.

I have (not installed yet) a 3000W inverter in the TV.. so AC won't be an issue but I want to be able to go dry when needed.
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Old 03-28-2012, 07:34 AM   #6
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dddire-- I don't see where you have considered running the fridge & furnace on gas, that would extend your battery life. Larry
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Old 03-28-2012, 06:00 PM   #7
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F250 is right. Run fridge & furnace on gas. We camp dry for a month at a time. Last year we used 21 pounds of propane for everything but cooking. We carry a separate 20 pounder for BBQ and coleman propane stove(we don't cook in the trailer). We have an 80 watt solar panel that more than meets all our power needs
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Old 03-28-2012, 06:04 PM   #8
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Maybe you are just talking about the power needed for the furnace fan and fridge controller???
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Old 03-28-2012, 07:08 PM   #9
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We almost always dry camp with our X18D. We have it down to a science now. The lights will suck your battery dry. We have those circle LED lights next to the camper lights and hang small lanterns from the tent support poles with S hooks. I have a $1 store pop light in the bathroom. We DO use our furnace at night and set to about 60. We do use the hot water heater. Water pump is key - don't want to lose that. Once we lost our battery the oven wouldn't light. Stove did so we used it for heat one morning but the oven wouldn't.

Now that we don't use the lights, we go 3-4 days easy. When we get worried, we hook up our truck and trickle charge the battery for an hour. We're just getting ready to go solar but I'm looking for a good deal on one of those quiet Honda generators if I can find one.

Cheers! Kim
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Old 03-28-2012, 08:48 PM   #10
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Quote:
Originally Posted by dddire View Post
To provide context on how much this is the Jayco manual states running the fridge and furnace on 12vDC continuously would use 75 amp hours of power.

Battery usage can be confusing so do not hesitate to ask questions.

Dan in NY
Interesting, so how would one convert this to continuous running time?
I realize the fridge and furnace won't run continuously but it would give me an idea of how little I might expect from this battery.

I have (not installed yet) a 3000W inverter in the TV.. so AC won't be an issue but I want to be able to go dry when needed.[/QUOTE]

dddire - what do you plan to power the 3000w converter with?? As for real use remember you should only use 1/2 the battery or 40 AHs. As others have stated you can leverage the propane to minimize battery drain. The LED lights are a must if you intend to dry camp much as the stock bulbs suck power.

Dan in NY
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