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09-12-2011, 02:14 PM
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#1
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Junior Member
Join Date: Aug 2011
Posts: 13
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Power inverter?
Our new to us 5th wheel has a fridge that only runs on 110v. It has a power inverter. My question is will the tow vehicle provide enough power to keep the rv batteries charged and the fridge running while towing for several hours?
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09-12-2011, 02:18 PM
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#2
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,604
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never heard of a 5th wheel with an electric only fridge, unless the previous owner did a changeout.
most tow vehicles, unless specially set up, will only trickle charge a battery.
you would have to drive for hours to recharge a battery.
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09-12-2011, 02:29 PM
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#3
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Site Team
Join Date: Mar 2008
Location: Louisville, KY
Posts: 10,518
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Quote:
Originally Posted by Jerry B
Our new to us 5th wheel has a fridge that only runs on 110v. It has a power inverter. My question is will the tow vehicle provide enough power to keep the rv batteries charged and the fridge running while towing for several hours?
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Maybe. This is a tough one. The hard part is we don't know the amps/watts
draw of your fridge and inverter. Read the fine print in the owners manual for
the fridge and tell us how many watts it uses.
I'm gonna guess it will be OK as long as you aren't going camping in the
boonies with no hookups.
We used to rent house boats that had little 12 cu ft compressor refrigerators.
They used an inverter to run it off of the main battery which was a big ole
semi trailer type battery. We had to run the generator each afternoon for
several hours to charge the battery otherwise the low voltage alarm would
wake us up in the middle of the night.
I think you'll be OK but the only way to tell for sure is a real life test run.
Good luck!
__________________
Peace!
Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
2016 Evergreen Everlite 242RBS
29' empty nest model. Blue Ox WD hitch
(1 queen bed, large main cabin and huge bathroom)
Camping days 2010-53, 2011-47, 2012-41, 2013-41, 2014-31, 2015-40, 2016-44, 2017-63, 2018-75, 2019-32, 2020-41, 2021-49, 2022-43, 2023-66
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09-12-2011, 03:15 PM
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#4
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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A standard battery will not last very long.
my bosses coach has six 6 volt batterys and it draws them down pretty fast.
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09-12-2011, 04:41 PM
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#5
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,268
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Quote:
Originally Posted by Jerry B
Our new to us 5th wheel has a fridge that only runs on 110v. It has a power inverter. My question is will the tow vehicle provide enough power to keep the rv batteries charged and the fridge running while towing for several hours?
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Can you post the model number and manufacturer of your fridge? It should be near the door or the fridge or freezer section.
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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09-12-2011, 06:36 PM
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#6
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Dismember
Join Date: Jun 2011
Location: Orcutt, California
Posts: 32
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On a recent trip to Seacliff State Beach, I was admiring a TT with a 400W solar array on the top. I struck up conversation with proud owner and he said that although he could run his reefer on propane, his preferred method when towing was to run the frig on AC.
I found this kind of interesting because I had just rewired my AC side to be able to isolate the reefer/converter/air conditioning but otherwise power up entire TT via my inverter.
After hearing his story, I plugged my reefer into the inverter side power. IIRC the inverted draw was pretty big (~15A?). This is in the range of being doable while towing but I haven't gotten around to doing further tests to ensure adequate margin. Until I was confident that I was significantly power positive, I would rather sip the propane. If/when I get around to doing some more tests, I will post the results.
__________________
2012 Wildwood 24TBSS
2x80W Solar Panels, Morningstar MPPT Controller, Xantrex LinkLite Battery Monitor, Xantrex ProWatt 2000 Inverter
2010 Toyota Tundra DoubleCab 5.7L 4X4
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09-12-2011, 07:38 PM
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#7
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,268
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If I had 400 watts on the roof the fridge would be plugged into the inverter all the time I drove.
Sun = free; Propane tied to the price of gasoline.
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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09-12-2011, 07:52 PM
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#8
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Dismember
Join Date: Jun 2011
Location: Orcutt, California
Posts: 32
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herk,
I must confess I was suffering from a severe case of panel envy after talking with the guy. He and his wife were 50/50 liveaboards and run satellite dishes, computer networks, etc on there. He also had four 6V batteries.
I am pretty happy with my 160W configuration; however, if my solar controller could handle more than 200W I would add more panels. It hurt me at my core to have a similar sized trailer to mine housing twice the electric systems....
Hopefully a complete LED swap out will scratch the itch.
__________________
2012 Wildwood 24TBSS
2x80W Solar Panels, Morningstar MPPT Controller, Xantrex LinkLite Battery Monitor, Xantrex ProWatt 2000 Inverter
2010 Toyota Tundra DoubleCab 5.7L 4X4
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09-12-2011, 08:07 PM
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#9
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,268
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This is a perfect example why you should plan ahead on the controller. A properly sized controller should be able to handle additional panels if (most likely when) you decide to do so.
I feel the same about tow vehicles. Buying the minimum sized tow vehicle for your current camper guarantees you will be replacing BOTH when your decide to upgrade (or replace) your current camper.
Most folks will tell you (if they are honest about it) that campers have a useful life rated at a maximum of 10 years. Yes, I know there are campers out there older (in some cases MUCH older) than that so don't bother to flame me.
While there seems to be loads of old cars out there with 200,000 miles on them too; but just look at the number of late model cars in junk yards. They got there somehow. Accidents and poor maintenance have destroyed more campers than "wore out."
These ultra-lite frames used to make 3/4 ton sized campers "half ton friendly" do wear out from flexing. I am seeing a LOT more photos of cracked frames than I have ever seen before. Mods should be made with "portability" in mind.
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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09-13-2011, 06:45 AM
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#10
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Site Team
Join Date: Mar 2008
Location: Louisville, KY
Posts: 10,518
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Remember the OP simply asked if we thought his tow vehicle would be able to power
his 120v ac fridge via an inverter.
I'm assuming he meant while he was on the road engine running.
My wild guess was yes but without knowing anything about his fridge it's a very
wild guess.
Most trucks now days have 100 amp alternators. You don't want your alternator
running at full power for very long as I believe it would over heat but I still -think-
this guy can do what he asks.
__________________
Peace!
Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
2016 Evergreen Everlite 242RBS
29' empty nest model. Blue Ox WD hitch
(1 queen bed, large main cabin and huge bathroom)
Camping days 2010-53, 2011-47, 2012-41, 2013-41, 2014-31, 2015-40, 2016-44, 2017-63, 2018-75, 2019-32, 2020-41, 2021-49, 2022-43, 2023-66
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09-13-2011, 08:24 AM
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#11
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Junior Member
Join Date: Aug 2011
Posts: 13
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I need more info for some of you to answer my question better. The trailer is 100 miles from here so right now I dont have info on the fridge. I will have to check on the output of the truck alternator. It is a 2003 GMC 3/4 ton HD with an 8.1 engine.
We had the trailer at the dealer for some minor repair and I turned the fridge on before leaving there. It came on just like it was supposed to but after about 1.5 hours towing it was off. I'm not sure the batteries were fully charged on the rv but I thought the truck charging system would keep them up enough to run the fridge. The trailer stay's in one place most of the time anyway but if we do travel I'm hoping to not have to empy the the fridge while on the road or at least would be nice for it to stay cold. Probably not really a big deal . I was just expecting it to work.
Thanks for everyones input.
Jerry.
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09-13-2011, 10:37 AM
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#12
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Site Team
Join Date: Mar 2008
Location: Louisville, KY
Posts: 10,518
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First thing is to make sure your truck socket battery lead is operational.
Some trucks must have a fuse installed in order for the Trailer battery
connection to be hot at the truck rear bumper socket.
One way to tell this is with a meter.
Here is a photo of the typical 7 pin socket found on the back end of many
trucks.
Notes- the notch is at the TOP in this photo.
The left side is looking at the truck socket with the door held open.
The right side is looking at the BACK wire side of the socket.
You're just interested in the left photo.
You should read about 15 volts between the 1 o-clock battery pin and
the 7 o-clock ground pins with the truck engine running.
It's possible your truck battery to RV socket fuse is bad or missing.
I believe it's found in the fuse block under the hood but it's been 7 years
since I had to install mine so I'm not exactly sure.....
Check this first! Maybe it will solve your problem.
Good Luck!
__________________
Peace!
Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
2016 Evergreen Everlite 242RBS
29' empty nest model. Blue Ox WD hitch
(1 queen bed, large main cabin and huge bathroom)
Camping days 2010-53, 2011-47, 2012-41, 2013-41, 2014-31, 2015-40, 2016-44, 2017-63, 2018-75, 2019-32, 2020-41, 2021-49, 2022-43, 2023-66
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09-13-2011, 10:58 AM
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#13
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Junior Member
Join Date: Aug 2011
Posts: 13
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I checked this last weekend with a test light. Did not have a volt meter on hand but it did light the test light so I assume battery voltage.
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