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Old 02-04-2014, 12:08 PM   #1
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GFCI hums only with inverter

I had a GFCI outlet go bad on me. When plugged into a 50 amp circuit in an RV I changed it out (with the power off at the time) and it worked fine.

We moved to a new location and on the way spent the night in a dry camp. I turned on the inverter and the GFCI outlet hummed. I figured it was going bad or the wiring was loose. I figured I'd address it the next day when we reached our new RV park.

I plugged into the 50 amp circuit there and the outlet works fine. No hum.

Any idea why it would hum on the inverter but not plugged into shore power?
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Old 02-04-2014, 03:11 PM   #2
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I am going to take a guess here that your inverter is an MSW type....

A True sine inverter is clean, or cleaner than shore power.. An MSW is major dirty power.
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Old 02-04-2014, 03:27 PM   #3
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Quote:
Originally Posted by wa8yxm View Post
I am going to take a guess here that your inverter is an MSW type....

A True sine inverter is clean, or cleaner than shore power.. An MSW is major dirty power.
I agree re the non symetrical output from a MSW inverter. If you have an oscilloscope and look at the wave form from a MSW inverter it will likely have a very dirty output that can cause all sorts of interference and other strange performances in electronic/electrical circuitry. I have "scoped" several Inverters and the PSW are pretty good, but no two MSW units were the same and all had a very messy output with varying degrees of sawtooth and square wave combinations with a few spikes thrown in to boot.
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Old 02-04-2014, 10:36 PM   #4
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Thanks for the replies! I don't recall the old one humming before it went out while using the inverter. Are there GFCI outlets that will work better with a MSW?

Is there any danger in using that outlet or is it just annoying?
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Old 02-04-2014, 11:02 PM   #5
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If it is a modified sine wave inverter, it may cause problems with some motors or electronic equipment. As you can see a true sine wave rounds off as it cycles. The MSW is more choppy and changes abruptly which may account for the hum..
--However (I read your post again) if there was no hum when using the inverter before, I would suspect the new GFCI.
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Old 02-04-2014, 11:11 PM   #6
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It is just annoying. I had the hum in my first coach. GFCI hummed on inverter power for 10 years but kept on working. Got a new coach last year, and guess what? The GFCI hums on inverter power!
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Old 02-05-2014, 10:52 AM   #7
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It may be the new GFCI is more senistive to the stile wave form of the MSW inverter.
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Old 02-05-2014, 11:04 AM   #8
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Just started doing some googling and people mention that there are GFCI outlets that are made to work with MSW. Does anyone know of a brand and model to look for? Would the packaging state that it will work with a MSW.

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Old 02-05-2014, 11:08 AM   #9
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I once read of a similar problem. The guy purchased the vest Leviton brand GFCI outlet & the hum went away. I had the hum on my MSW inverter equipped Tiffin. My Thor has a PSW & no hum.
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Old 02-05-2014, 03:04 PM   #10
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I have not been able to find it lately but I once went to the XANTREX webpage and downloaded a manual (This was a few computers ago) for, as I recall, the X-Power MSW inverters.

It listed several brands known to play nice with MSW..

Now as it happens I do have an X=power. in the basement, just in cuss I need it. (no that's not a typo cause if i need it I'll be cussing).

What I use is a Prosine 2.0,, Thats a true sine job, No such list, In fact here is the list of things that do not work well with the Prosine....

Anything needing more than 2,000 watts to start.

End list
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Old 02-05-2014, 03:47 PM   #11
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Tell us how you REALLY feel about it!
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Old 02-06-2014, 12:44 PM   #12
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What do I think of my Prosine.. Love it... For example this morning I was busy microwaving part of my breakfast when the park's 30 amp breaker decided to trip (Did not think I had that much turned on) the inverter took over and finished the job for me.. Exactly as it should. The microwave never knew it had lost power, The Televisions also did not respond to the outage but continued working exactly as though power had not failed, This computer.. Can't tell since it has an internal battery but I'm betting it did not know the difference either.
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Old 02-06-2014, 01:43 PM   #13
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Good to hear! I'm happy with mine also!
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