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Old 03-23-2024, 08:03 AM   #1
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2023 30' Classic
Napa , California
Join Date: Aug 2020
Posts: 59
F250 Pro Power Ground Fault

New F250 with Pro Power (2300W/110V). Plan was to use the power outlet in the bed to recharge the batteries when boondocking. When I plug in I get a ground fault notice and power does not flow to my Classic. Some posts (mostly related to the F150 PowerBoost which is similar but different) suggest removing the ground pin or putting a 3 prong to 2 prong adapter in between the truck outlet and the extension cord.

Of course any posts that suggest the 3 to 2 ground pin deletion say to do so at your own risk. That would not bother me so much if others responded with "it worked" or "screwed up my trailer electrical" or "burned down the trailer" but usually the cautionary post is the last item in the thread.

Filling out the picture is that I have 4 BB Li batteries and the 3000W Victron inverter. Not sure how the electric output of the truck "sees" the inverter or if the inverter has a floating neutral/ground.

Thanks for any suggestions!
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Old 03-23-2024, 08:23 AM   #2
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2023 28' International
Mercer County , New Jersey
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Posts: 735
With most generators and a EMS, you need a ground neutral plug such as

If you only have one outlet, there are some that are "pass through"
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Old 03-23-2024, 12:53 PM   #3
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2023 30' Classic
Napa , California
Join Date: Aug 2020
Posts: 59
Reply from r/AskElectricians

A reply to my post on another forum.

Ford designed their system as a bonded neutral with GFCI protection. This is appropriate for job site power.

When you use it for home standby though, you have to be careful how you have it setup. Most setups are going to be designed for utility service, where they will have the grounds & neutrals bonded. You only bond in a single location.

So fords system is looking at it and testing your circuit. It checks & sees the hot wire is clear, but when it tests the neutral it sees it’s not clear because that bond to ground and kills the circuit (really before it ever sends power).

So you need to separate grounds & neutrals for your RV, don’t bond them together. The Ford F250 will be your “service” with grounds & neutrals bonded.

But this is important….if you use any other generators with this RV, you must also make sure they have a bonded neutral. Otherwise you won’t have a complete equipment ground circuit & in a fault current won’t flow. This will lead to shock hazards. I’d recommend making a label indicating this so that you never forget nor does any other owner in the future.

If you ever use a transfer switch, it too would have to change & now switch the neutral wire.
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Old 04-07-2024, 01:11 PM   #4
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2023 30' Classic
Napa , California
Join Date: Aug 2020
Posts: 59
Okay just putting a bow on this thread after many experiments with various scenarios.

Ford's manual states:
"Neutral Floating - The neutral of the inverter generator is isolated from system ground.
Note: If additional grounding measures are required, consult with a qualified electrician."

I am still fuzzy on what a floating neutral is but it seems to present some problems.

Pro Power will not run a DeWalt 14amp portable air compressor. It will not run a 4amp bench grinder. It will run wife's two prong hair dryer which pulls 1,500 watts. It will run two prong car buffer and my 900 watt toaster oven. Almost anything that has hot/neutral/ground plug seems to have a problem.

If I separate the ground from my extension cord, it will provide 300 watts to my Airstream. My Victron inverter, 3,000 watt model, needs me to reduce the input amperage limit to 3 amps. If I tell the inverter to pull more than 3 amps, the inverter faults out. I am assuming this is because the inverter is looking for more watts, but the Pro Power can't give more reliably.

For comparison, it takes my Honda EU2200i generator ~1.5 hours to raise my State of Charge from 50% to 100% at 1,950 watts. If I can only get 300 watts from Pro Power, then I am looking at running my truck ~4.3 hours. In a boondocking scenario I do not have to have 100% SOC. If it is cloudy and I just need some extra help for my solar from the Pro Power then I have a solution that will get me through most of my camping so far. Once the wife retires and we spend more time on the road with hopefully some BLM camping, we will just have to adjust as needed. I do not want to run my truck for hours for so little return on watts generated.

I am disappointed in the advertising of the Pro Power system. Everything has a caveat, but in bigger bolder letters Ford should have said the 2,000 watts Pro Power provides are incredibly limited.
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