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Old 08-16-2019, 07:57 AM   #1
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One battery or two?

We pick up our 1st 5’er at the end of September. It will have a residential refrigerator and 1000w pure sine inverter. The dealer will provide one battery. No generator or solar (yet). We typically stay in parks with full hookups with the occasional overnight with no electricity and like to drive no more than 300 miles in a day. With our scenario will one battery be sufficient or should I have two? Any suggestions on battery type and best wiring options (for two batteries) would be much appreciated.
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Old 08-16-2019, 08:10 AM   #2
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that battery from dealer is prob a cheap 24 series. id get rid of it and out in two deep cycle 6v in series.
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Old 08-16-2019, 08:12 AM   #3
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Just with my limited experience. Get 2 batteries. My coach has a residential fridge and came with 2 batteries... a 400 mile drive a few days ago had me at about 12.5 on arrival... looks like I’ll be upgrading the truck to trailer charge line like others have done.
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Old 08-16-2019, 08:17 AM   #4
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How much power does the fridge use? You're probably fine if your truck alternator is charging the battery.
If it's not though, one battery won't cut it for very long.
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Old 08-16-2019, 08:19 AM   #5
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Originally Posted by Encmerk View Post
Just with my limited experience. Get 2 batteries. My coach has a residential fridge and came with 2 batteries... a 400 mile drive a few days ago had me at about 12.5 on arrival... looks like I’ll be upgrading the truck to trailer charge line like others have done.
12.5v is about 80% SoC. Very imprecise doing to just by voltage, but ballpark, and that's with the charge line doing *something* (not much as we all know) Max I've ever seen our charge line provide is 8-10a and that's with a very discharged battery.

I'd get as many batteries as you can fit.
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Old 08-16-2019, 09:11 AM   #6
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Get 2 or more.
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Old 08-16-2019, 09:37 AM   #7
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"I have too much battery capacity!"

Said no one ever.

A good quality pair of group 31s can have more capacity than a pair of 6vs.
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Old 08-16-2019, 10:39 AM   #8
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To get high AH rating, more then 105 AH, from GP31 batteries your going to spend a lot of money on each.

GP GC2, 6 volt batteries are very common and inexpensive. Even low budget ones have 205 or more AH. At $90 a piece, you need two, but they are the best AH per dollar.

They are also spicificicly built for deep cycling in electric golf cars.
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Old 08-16-2019, 11:18 AM   #9
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Get a pair(or more if you have room) of 6V GC2 batteries from SAMs/Costco.
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Old 08-16-2019, 11:21 AM   #10
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I have 2 group 27 batteries. I have a residential fridge. Last winter I did a test to see if I could run the fridge and heater through the night just using the 2 batteries. They didn’t make it all night. Only about 6 hours. That being said I’m sure I could’ve turned off the fridge and it would’ve stayed cold all night so I could run the heater.
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Old 08-16-2019, 11:27 AM   #11
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I have 2 group 27 batteries. I have a residential fridge. Last winter I did a test to see if I could run the fridge and heater through the night just using the 2 batteries. They didn’t make it all night. Only about 6 hours. That being said I’m sure I could’ve turned off the fridge and it would’ve stayed cold all night so I could run the heater.
You should have gotten thru the night, unless you had the Ice maker making ice or your batteries aren't up to snuff.
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Old 08-16-2019, 02:41 PM   #12
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Get at least 2 batteries. Chances are pretty good that 1 battery will not run the fridge all night. A lot also depends on the ambient temperature and how many time the fridge is opened.
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Old 08-16-2019, 03:28 PM   #13
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To get high AH rating, more then 105 AH, from GP31 batteries your going to spend a lot of money on each.

GP GC2, 6 volt batteries are very common and inexpensive. Even low budget ones have 205 or more AH. At $90 a piece, you need two, but they are the best AH per dollar.

They are also spicificicly built for deep cycling in electric golf cars.
You can easily find a G31 with 105ah for 135$ each
Buy 2 and have 210ah for 270$

Or buy 2 6v 125ah for 99$ and have 125ah for 198. Your call.
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Old 08-16-2019, 03:30 PM   #14
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Tell the dealer you want TWO six volt batteries.

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