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07-25-2021, 07:58 AM
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#41
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Montana Fan
Join Date: Mar 2020
Location: Frostbite Falls
Posts: 434
M.O.C. #26015
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I put a new battery in , & I'll find out tomorrow if it cured the problem. Thanks for all of the trouble shooting replies.
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07-25-2021, 08:42 AM
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#42
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,550
M.O.C. #2283
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Quote:
Originally Posted by 77cruiser
I put a new battery in , & I'll find out tomorrow if it cured the problem. Thanks for all of the trouble shooting replies.
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You will need to know how long the new batteries will last. Your converter will not run a battery all the way down. If you have a 100 amp hour battery you will not get 100 amp hours out of it before the system shuts down. So check often as you travel.
Lynwood
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07-25-2021, 11:40 AM
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#43
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Seasoned Camper
Join Date: Jan 2019
Location: Winter Haven
Posts: 76
M.O.C. #23309
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If you read the manual on the refrigerator it states NOT to use a GFI circuit. I read a post on this site that he removed the GFI outlet on the inverter and solved his problem. I replaced my GFI on the inverter with a plan outlet and solved all my problems.
__________________
2019 3121RL
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07-25-2021, 02:17 PM
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#44
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Montana Master
Join Date: Jun 2020
Location: Qualicum Beach
Posts: 665
M.O.C. #26399
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Quote:
Originally Posted by 77cruiser
I put in a new group 27, I'll see what happens Monday, gonna be about 100 deg.
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You need deep cycle batteries. The word 'crank' or CCA or MCA means it is NOT a true deep cycle. The gold standard is Trojan T105's. A pair as they are 6V. Also, unless you have a hole in your fridge, keeping it closed will keep it cool with power off for 8 hrs normally, maybe only 4 to 6 at 100F.
Also get a Victron BMV so you can keep an eye on the battery. Never allow to go below 50% SOC. Using voltage is a waste of time, it is subject to rest time, loading etc, use a shunt to know the truth.
__________________
2018 Keystone Montana 3811MS
2017 Ford F450 diesel dually
600AH Battle Born Lithium Batteries, 1,080 watts solar
3,000 watt hybrid inverter with 120A charger
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07-25-2021, 02:34 PM
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#45
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Montana Master
Join Date: Jun 2020
Location: Qualicum Beach
Posts: 665
M.O.C. #26399
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Quote:
Originally Posted by 77cruiser
I put a new battery in , & I'll find out tomorrow if it cured the problem. Thanks for all of the trouble shooting replies.
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Get yourself a heat gun and look for the leak. It will probably be around the center seal, a few have reported issues with that.
https://www.amazon.com/Thermometer-N...aps,616&sr=8-3
__________________
2018 Keystone Montana 3811MS
2017 Ford F450 diesel dually
600AH Battle Born Lithium Batteries, 1,080 watts solar
3,000 watt hybrid inverter with 120A charger
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07-26-2021, 04:02 PM
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#46
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Montana Fan
Join Date: Mar 2020
Location: Frostbite Falls
Posts: 434
M.O.C. #26015
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Just went 5 hrs. temp was 99 outside 91 inside & 36 in the fridge. I think the battery did it. Thanks for the help.
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07-26-2021, 05:38 PM
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#47
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,146
M.O.C. #1920
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77Cruiser, be aware that your truck is only providing a trickle charge. There are only a few amps going back into your battery. That’s why a lot of lithium battery owners put in a DC-DC charging system with 2/0 wire going back. You really should have 2 12v batteries with a residential fridge if traveling more than a few hours. Chances are, you are taking your battery below 50% and shortening the life. As others have pointed out, a good battery monitor will help you.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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07-26-2021, 06:21 PM
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#48
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,140
M.O.C. #25165
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Good news. That's probably easier and cheaper in the long run. I've run mine for 18 hours with truck charging a single group 27 battery. Battery maintained 100% the whole trip. The key is starting out with fridge cold. It doesn't need to run nearly as much then.
Also, the newer Samsung fridges are very efficient.
__________________
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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07-26-2021, 07:18 PM
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#49
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Montana Fan
Join Date: Mar 2020
Location: Frostbite Falls
Posts: 434
M.O.C. #26015
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Battery must not have been able to charge good enough to put out enough power to start the fridge.
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07-26-2021, 08:23 PM
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#50
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,146
M.O.C. #1920
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Robert, 5 amps at 120v is 50 amps on the 12v side (amps x volts = watts), but it doesn’t run all of the time. A typical 7 pin connector will deliver around 5 amps of charging per hour. If you are relying on something other than a shunted battery monitor, you won’t get an accurate measure. Now that is just what I learned before we installed our Bogart meter in the last unit and research for our Super Solar system. We run a BIM system and get about 40 amps from that, plus our solar. With summer heat, we would consume about a quarter of our solar during the day just for the residential fridge. And then watch it drain at night. I would think that two 12v batteries would be a minimum with a residential fridge. Just my opinion. If my math is wrong, I’m always interested in learning.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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07-27-2021, 05:28 AM
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#51
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,140
M.O.C. #25165
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I agree, it should have come with 2 12 volt batteries. When I replace mine, I'll go to 2 group 27's as that's all that will fit in our battery box without making major modifications. I never boondock and we always have hookups for electric and water at a minimum.
I was concerned that the single battery wouldn't keep up while travelling when I first got the rig, but I have been pleasantly surprised that it has done quite well. The 18 hour trip was the longest I have gone without having shore power and running the fridge with only the truck to charge battery.
__________________
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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