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 > When on inverter power GFCI won't reset

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DrewE

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Posted: 04/26/20 11:14pm Link  |  Quote  |  Print  |  Notify Moderator

The GFCI probably isn't liking the modified sine wave output of the inverter.

A GFCI does not need bonded ground and neutral at the input. In fact, using a GFCI is the only way I know of that the electric code permits installing a three prong outlet on an existing ungrounded circuit in an old building (that is, without running a ground wire and making it a grounded circuit). A GFCI will trip if ground and neutral are connected together somehow downstream from it.





time2roll

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Posted: 04/26/20 11:56pm Link  |  Quote  |  Print  |  Notify Moderator

Sine wave is only $100 more.

https://www.giandel.com.au/product/giand........e-sine-inverter-2000w-12v-ps-2000qar12v/


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wa8yxm

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Posted: 04/27/20 05:39am Link  |  Quote  |  Print  |  Notify Moderator

I would first get a true sine wave inverter
SOME GFCI's won't work right unlelss neutral and ground are bonded. If that is the case you will need to bond at the inverter. I suggest it in any case


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Ductape

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Posted: 04/27/20 07:49am Link  |  Quote  |  Print  |  Notify Moderator

We experienced multiple GFCI false trips and refusals to reset with a Magnum MSW inverter. All original by the coach builder, and obviously it can work for many people. I did some research and turned up a white paper by a maker of GFCI outlets stating there were known compatibility issues with MSW.

Our inverter was replaced under warranty with a PSW, no problem since. And the microwave heats faster on PSW as well.


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Bobbo

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Posted: 04/27/20 08:00am Link  |  Quote  |  Print  |  Notify Moderator

Darryl&Rita wrote:

It may be fixable by installing a jumper on the inverter, tying Neutral and Ground together, but that opens another can of worms.


wa8yxm wrote:

SOME GFCI's won't work right unlelss neutral and ground are bonded. If that is the case you will need to bond at the inverter. I suggest it in any case

Modern GFCI's do not need the NEUTRAL and GROUND bonded.

Has a test been done to see if the GROUND and NEUTRAL are already bonded? If you have 120v between the HOT and NEUTRAL, 120v between the HOT and GROUND, and 0v between the NEUTRAL and GROUND, it is already bonded. Even my cheap WFCO 1000 watt inverter bonds them when it powers up.

*** IMPORTANT NOTE ***

If you bond the GROUND and NEUTRAL, they can ONLY be bonded when the inverter is supplying the power. You MUST break that bond when shore power is supplying the power.

I, also, agree that the problem is with the modified sine wave inverter.


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vermilye

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Posted: 04/27/20 08:00am Link  |  Quote  |  Print  |  Notify Moderator

DrewE wrote:

The GFCI probably isn't liking the modified sine wave output of the inverter.

A GFCI does not need bonded ground and neutral at the input. In fact, using a GFCI is the only way I know of that the electric code permits installing a three prong outlet on an existing ungrounded circuit in an old building (that is, without running a ground wire and making it a grounded circuit). A GFCI will trip if ground and neutral are connected together somehow downstream from it.
I agree. In addition, some inverters can be destroyed by bonding the neutral to ground. If you insist on trying this, be prepared to let the magic smoke out...


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Bipeflier

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Posted: 04/27/20 09:13am Link  |  Quote  |  Print  |  Notify Moderator

Suggest you hire a QUALIFIED electrician.


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pcottrell81

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Posted: 04/27/20 11:46am Link  |  Quote  |  Print  |  Notify Moderator

I swapped the GFCI plug to a new one, it still hums but it does test and reset.

However, I feel the inverter is producing dirty power because of the humming in the GFCI.


Any recommendations?


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MDKMDK

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Posted: 04/27/20 11:52am Link  |  Quote  |  Print  |  Notify Moderator

Stop guessing. Get it to someone qualified, who can look at what you have, and sort it out, and make it safe, before you get electrocuted or start a fire.


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pcottrell81

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Posted: 04/27/20 12:56pm Link  |  Quote  |  Print  |  Notify Moderator

Ductape wrote:

We experienced multiple GFCI false trips and refusals to reset with a Magnum MSW inverter. All original by the coach builder, and obviously it can work for many people. I did some research and turned up a white paper by a maker of GFCI outlets stating there were known compatibility issues with MSW.

Our inverter was replaced under warranty with a PSW, no problem since. And the microwave heats faster on PSW as well.


I am in the same boat. My electrician buddy said to swap out the plug see if that works, and it did, slight hum still. I tried another inverter and it worked too. My last few inverters were MSW, but never had this problem. I bought what I thought was a decent one however it looks like I'm wrong.

I will return it and get a PURE SINE, **** their pricy though. It sounds like its worth it.

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