Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 10-08-2016, 08:08 AM   #1
Junior Member
Join Date: Nov 2013
Posts: 14
Inverter problem?

My 2015 Thor Four Winds 33sw Super C has a perplexing power problem. 120v circuits all seem to work fine when on shore power or generator. When on house battery the inverter 120v power is going to the residential fridge only. The rest of the 120v circuits are dead. The inverter (Xantrex PRO XM 1800) seems to be working (no faults, power to the fridge). This makes no sense to me since shore/generator supplied power is switched in the inverter so both shore and inverter power use the same cable to the breaker panel. Anyone have any ideas?

jebsen is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 10-08-2016, 08:17 AM   #2
Senior Member
vsheetz's Avatar

Fleetwood Owners Club
Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 13,038
Hmmm... Check breakers / fuses on the inverter itself?

Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
vsheetz is offline   Reply With Quote
Old 10-08-2016, 08:34 AM   #3
Junior Member
Join Date: Nov 2013
Posts: 14
There is a breaker reset button on the inverter but it appears to be disconnected because the inverter is hardwired into the RV.
jebsen is offline   Reply With Quote
Old 10-08-2016, 08:51 AM   #4
Moderator Emeritus
Gary RVRoamer's Avatar

Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,736
Is this a new problem, or has it never worked? One simple explanation is that only the fridge outlet is wired to the inverter...

Some RVs have two inverters, one dedicated to the fridge and another for everything else. Mine is set up that way.
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is online now   Reply With Quote
Old 10-08-2016, 09:18 AM   #5
Junior Member
Join Date: Nov 2013
Posts: 14
Good question. I think it has worked in the past but not sure. Limited dry camping experience. There is only one inverter. I can only see one #14 cable coming out of the inverter so that must serve both the fridge and the 120v breaker panel. The fridge power doesn't go thru the panel so it must split off somewhere.
jebsen is offline   Reply With Quote
Old 10-08-2016, 10:04 AM   #6
Senior Member
Join Date: Mar 2016
Posts: 370

It probably never did. For an inverter to supply all the power that goes through the AC panel, it would have to be more than 1800VA and you would have to have a very big house bank.

The bet is that it supplies power for the reefer and maybe some entertainment systems. It cannot support the A/C, microwave or water heater. This is pretty common because the price of an inverter and a residential reefer is a whole lot less than any absorption unit out there.

Just undo your shore power and go around and test and mark those that are live.

F76Marion is offline   Reply With Quote
Old 10-08-2016, 10:58 AM   #7
Junior Member
Join Date: Nov 2013
Posts: 14
Thanks. You make a couple of good points that caused me to rethink this. I never expected the inverter to run the A/C units but I now realize there is nothing in the owners manual that tells me what should be on the inverter. The are two 120v outlet circuits (one a GFI). I was expecting them to be powered by the inverter. Maybe not? With shore power disconnected nothing is powered except the fridge and the 12v stuff. I would hope that the furnace fan would run off the inverter (it doesn't), otherwise there is no heat when dry camping. I guess it's back to Thor support to set my expectations correctly!
jebsen is offline   Reply With Quote
Old 10-08-2016, 11:43 AM   #8
Senior Member
Scottybdivin's Avatar

Newmar Owners Club
Join Date: Jun 2012
Location: Spicewood Texas (West of Austin)
Posts: 3,856
The furnace should run straight off 12V and not go through the inverter. If your inverter powers more than just the fridge, there would more than likely be a sub panel with breakers for the different circuits.
Scotty and Kristen, Airedales Dagny and Wyatt
2007 Newmar Mountain Aire 4528, 450 HP ISM, Allison 4000, 8 Trojan T-105's
2014 F150 4x4 Crew Cab Platinum 157" WB
Roadmaster Blackhawk 2, RVI2 Brake System
Scottybdivin is offline   Reply With Quote
Old 10-08-2016, 12:02 PM   #9
Junior Member
Join Date: Nov 2013
Posts: 14
No other breakers that I can find. It may be that the inverter powers only the fridge and the TVs. L
jebsen is offline   Reply With Quote
Old 10-08-2016, 02:28 PM   #10
Senior Member
Tiffin Owners Club
Appalachian Campers
Mid Atlantic Campers
Coastal Campers
Freightliner Owners Club
Join Date: Jan 2015
Posts: 1,537
Don't have your coach to know exactly how it's wired, but sounds like you only have limited circuits on the inverter. Refrig and TV's are generally the first ones that I see on inverters. When the inverter wattage (I have a 2K watt) gets higher you'll see microwaves/convection and a string of outlets (mine is on the PS kitchen/bath/dining/bedroom).

Since all of your circuits work correctly when on shorepower/generator, I'm betting this is how Thor designed it. You can call them, and they should be able to confirm it definitively.

With only one #14 cable, you know it can't be more than 15 amps in total. Since even on shorepower the devices would be powered thru that cable, it's only the one circuit.
DaveB, Raleigh, NC
2015 Tiffin RED 33AA, w/Honda CRV
VMSpc, Magnum BMK/ARC50
Kiawah is offline   Reply With Quote
Old 10-15-2016, 09:08 AM   #11
Junior Member
Join Date: Nov 2013
Posts: 14
Thanks for all the help. Here's what I have concluded. When on the inverter, the fridge and TVs are powered. In addition, there is a duplex outlet in the mbr under the TV that is also powered. That's it. All the other 120v stuff is not powered. Now it all makes sense.

jebsen is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Installing an Inverter in a Coach That Doesn't Have a Factory Inverter vettenuts Newmar Owner's Forum 26 07-08-2014 09:37 AM
Inverter and Inverter Remote Panel Manual EL_Carlson Winnebago Industries Owner's Forum 2 05-01-2011 05:31 PM
inverter/charger or just inverter bdawson11 RV Systems & Appliances 10 06-14-2009 09:48 AM
Simple Inverter Hook Up? Plug my 50 amp to the inverter? E Z Livin MH-General Discussions & Problems 7 12-19-2005 02:59 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:49 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.