SuiteSuccess Posted January 23, 2018 Report Share Posted January 23, 2018 My trailer has two group 27 (I believe) Marine Deep Cycle batteries. I do not have a generator on truck or trailer. I would like to run my fridge on an inverter as we travel between campgrounds. That time period before we would be back on shore power would almost always be less than 12 hours. I do not want to run on propane while traveling. My question could I do this on two batteries and what size inverter just for fridge, no other loads. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
Parrformance Posted January 23, 2018 Report Share Posted January 23, 2018 2000kw, would leave you room to grow. 2006 Volvo VNL 780, " Arvey" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift 2003 Jeep Wrangler Rubicon 2010 Forest River Coachman Freedom Express 280RLS Jackalopee Link to comment Share on other sites More sharing options...
Chad Heiser Posted January 23, 2018 Report Share Posted January 23, 2018 From the propane statement, I am assuming you have a typical RV refrigerator? If so, the electric heating element is going to draw a lot of power. The first thing you need to do is put a Kilowatt (or other measuring device) on it for a few hours during the heat of the day and see how much power it draws per hour. With that information, we can give you a much better answer. 2000 Kenworth T2000 w/ Cummins N14 and autoshift 2017 DRV Mobile Suite 40KSSB4 with factory mods, dealer mods and personal mods - now in the RV graveyard 2022 DRV Full House MX450 with customized floor plan 2018 Polaris RZR Turbo S (fits in the garage) 2016 Smart Car (fits in the garage or gets flat towed behind the DRV when the RZR is in the garage)My First Solar Install ThreadMy Second Solar Install Thread & Photos and Documents Related to the buildMy MX450's solar, battery and inverter system - my biggest system yet! chadheiser.com West Coast HDT Rally Website Link to comment Share on other sites More sharing options...
lockmup68 Posted January 23, 2018 Report Share Posted January 23, 2018 If you were to go to a residential refrigerator, easier to answer in my opinion. I think Chad has a simple 1000w Magnum inverter that runs his refrigerator. I have the same inverter and can go 8-10 hours on the two interstate batteries. If I hooked up my power to the trailer plug, I assume I could go indefinitely if it was charging the batts off the truck alternator while going down the road. 2003 International Eagle 9200i, Cummins ISX, Freedomline 2007 Teton Scottsdale XT4 Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted January 24, 2018 Report Share Posted January 24, 2018 Carl, Our recent purchase came with a Xantrex Freedom HF 1000 watt inverter running on 2 6v batteries. It should theoretically be fine for 12-14 hours with a whirlpool fridge without the truck supplying any charge to the RV batteries. I say theoretically because our "New" batteries are cooked. When we had our Carrilite, I ran a cheap Harbor Freight inverter and a 5cuft freezer in the basement with no issue. The truck does supply a 14v charge but at a low amp. (14gauge wire) Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
BlueLghtning Posted January 24, 2018 Report Share Posted January 24, 2018 RV fridges on electrical power can pull a good electrical load. Residential fridges are much better on electric. If you don't ever plan to boondock, you may be better just upgrading to a residential fridge to have all the benefits of it if you don't plan to ever run your current one on propane and that will allow you to size the inverter and batteries just for the fridge. Dan (Class of 2017) - 2012 Ram 3500 & 2005 Alpenlite Valhalla 29RK Contact me at rvsolarconsulting.com or Two Wheel Ramblin Link to comment Share on other sites More sharing options...
CrazyCooter Posted January 24, 2018 Report Share Posted January 24, 2018 My last few rvs that had just a single wide 2 door refers by Dometic and Norcold took about 22ah to run on 12v with losses through the inverter. We now have a double wide 4 door Norcold and is a pig! 43ah to run it....must have 2 heating elements? I ran the smaller refers on the inverter all the time enroute, but the larger unit just draws too much current to get charged from the truck without punishing the batteries. 1999 Peterbilt 385 C12 430/1650 13spd 2006 Dodge 3500 DRW 4x4 2010 Hitchhiker Champagne 36 LKRSB Link to comment Share on other sites More sharing options...
DesertMiner Posted January 24, 2018 Report Share Posted January 24, 2018 No solar.... Link to comment Share on other sites More sharing options...
CrazyCooter Posted January 24, 2018 Report Share Posted January 24, 2018 Solar doesn't do much this time of year. I have 1645 watts on the roof and only generate about 200ah per day depending on weather and even less while moving. 1999 Peterbilt 385 C12 430/1650 13spd 2006 Dodge 3500 DRW 4x4 2010 Hitchhiker Champagne 36 LKRSB Link to comment Share on other sites More sharing options...
SuiteSuccess Posted January 24, 2018 Author Report Share Posted January 24, 2018 7 hours ago, CrazyCooter said: My last few rvs that had just a single wide 2 door refers by Dometic and Norcold took about 22ah to run on 12v with losses through the inverter. We now have a double wide 4 door Norcold and is a pig! 43ah to run it....must have 2 heating elements? I ran the smaller refers on the inverter all the time enroute, but the larger unit just draws too much current to get charged from the truck without punishing the batteries. That’s what we have, a single wide Dometic. It is fairly new and works great so don’t really want to pull it out and replace at this time. So what is the math to determine inverter size, battery size, and time I could run on inverter alone at 22ah? 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
CrazyCooter Posted January 24, 2018 Report Share Posted January 24, 2018 A pair of 27s is about 180ah or 90ah usable without punishing the batteries. That leaves about 4 hours of run time assuming you get no charge from solar or the truck to help.......not much time there. That might just cover it assuming the refer is cold before you leave and you don't open the door in transit. What about mounting the inverter on the truck and running the 120v line back to the trailer? Much less loss that way. 1999 Peterbilt 385 C12 430/1650 13spd 2006 Dodge 3500 DRW 4x4 2010 Hitchhiker Champagne 36 LKRSB Link to comment Share on other sites More sharing options...
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