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Old 10-08-2016, 08:08 AM   #1
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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?

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Old 10-08-2016, 08:17 AM   #2
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Hmmm... Check breakers / fuses on the inverter itself?

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Old 10-08-2016, 08:34 AM   #3
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There is a breaker reset button on the inverter but it appears to be disconnected because the inverter is hardwired into the RV.
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Old 10-08-2016, 08:51 AM   #4
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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.
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Old 10-08-2016, 09:18 AM   #5
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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.
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Old 10-08-2016, 10:04 AM   #6
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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.

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Old 10-08-2016, 10:58 AM   #7
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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!
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Old 10-08-2016, 11:43 AM   #8
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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.
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Old 10-08-2016, 12:02 PM   #9
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No other breakers that I can find. It may be that the inverter powers only the fridge and the TVs. L
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Old 10-08-2016, 02:28 PM   #10
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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.
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Old 10-15-2016, 09:08 AM   #11
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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.

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