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Old 10-26-2021, 11:12 AM   #1
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Several outlets only work on inverter ?

I have a 2015 30ft Itasca Sunstar , just replaced the power transfer switch with same model as the old one had a loose input conductor that shorted and fried the switch . So in the past when plugged into shore power all outlets were hot , now the outlets that are dual powered (shore,inverter) only work with the inverter on. Checked all fuses 12v and 120v , inverter reset OK . Everything else is as it should be.
Is there a switch of some sort that bypasses the inverter when on shore power?
Thanks, Chuck
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Old 10-26-2021, 11:30 AM   #2
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The make and model of your inverter would help, but, it is possible that the inverter's transfer switch was shorted out along with the coach's transfer switch you mention above. The inverter's transfer switch allows shore or generator power to flow through the inverter to the 110v outlets when they are available but uses the batteries and inverter to supply the 110v outlets when they are not.
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Old 10-27-2021, 07:33 AM   #3
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Check the 110vac breaker feeding the inverter. Reset it a couple of times.
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Old 10-27-2021, 09:40 AM   #4
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There is actually 2 circuit breakers for each line. 4 total. Try resetting all and the one on the inverter.
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Old 10-27-2021, 10:09 AM   #5
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Are you sure it's configured correctly? If there are two inputs and one output, is the input that's active when plugged into shore power also the one that actually is getting shore power?
Tom & Jeri
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Old 11-10-2021, 01:35 AM   #6
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Other than missing four feet, I believe we have the same unit.

Our inverter has/had a GFCI receptacle in the end of the inverter, and it was up against the compartment wall. It was impossible to reset w/o removing the inverter from the wall, reset it, and remount it. After a couple times of doing this, I removed the GFCI receptacle with a standard outlet. It could have been left out all together.

The outlets which only operate when the inverter is on are working correctly - or at least as I understand it. The inverter is a "pass through" unit meaning that it has to be on (and operating) so that shore electricity can "pass through" the unit to the receptacles inside.

We have a total of four outlets powered by the inverter.

Hope this helps.
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Old 11-10-2021, 05:40 AM   #7
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Originally Posted by Upinsmoke View Post
The inverter is a "pass through" unit meaning that it has to be on (and operating) so that shore electricity can "pass through" the unit to the receptacles inside.
I thought mine worked like that too, but I discovered that in order to get shore power to the receptacles at all, once plugged in but with everything off, I have to enable the BMS and the inverter/charger. Then I can shut it all off, battery switch and BMS included, and the receptacles are still live.

Not that it matters when plugged in I guess, as I can disable the inverter and charger functions separately, and it doesn’t matter if there’re some small parasitic load when plugged in anyway. But it’s just mildly annoying that I have to enable everything, then shut it all back down, to get shore power alone.
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Old 11-13-2021, 12:26 PM   #8
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Let me make a suggestion here, because I'm now completely confused. Download your schematics off the Winnebago web site. Also check your Owners Manual for proper operation of the Invertor.
There should be no reason for even running the Invertor unless you are dry camping and not running the generator. I have not used mine since I bought the MH in 2013. I guess I should test it out one day, but he DW only like to Glamp so I have to run the generator so she can have her electricity.
Try resetting the Invertor, don't believe the darn switches, just like on the generator. Sometimes they don't fully trip, trip them fully and reset them. Also if you don't have a AC only fridge, then why run the invertor anyway?
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