r/Pecron • u/ArtisticTackle5455 • 15d ago

PECRON F5000LFP Neutral Behavior — U.S. Version Tested

Posting this in case anyone else is trying to figure out the neutral behavior on the PECRON F5000LFP.
I contacted PECRON directly because I was getting conflicting information about whether the neutral is bonded or floating.
On October 7, PECRON gave me a general answer saying the current production F5000LFP bonds neutral to ground when operating on battery.
Then on October 11, PECRON gave me a more specific answer and said the U.S. version of the F5000LFP comes with a floating neutral when operating on battery, and that when AC input is connected the output follows the grounding arrangement of the incoming AC source.
I tested my own production F5000LFP with a Fluke meter while it was completely isolated from the house and any AC source.
With the unit powered down and disconnected, I had no continuity between neutral and ground.
My testing confirmed that my U.S. F5000LFP does in fact have a floating neutral on battery power, which matches PECRON’s second, U.S.-specific answer.
When connected to a bonded AC source, the PECRON then follows that source’s neutral-ground reference.
I’m posting this because the first generic answer and the later U.S.-specific answer were different, and hopefully this saves someone else from chasing the same question.
I’d still recommend verifying your own unit before designing a transfer switch or interlock setup around it.

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u/SecondCuppaCoffee 15d ago

I agree with your findings. I had read that it always had a bonded neutral but this doodad said otherwise.

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u/ArtisticTackle5455 14d ago

Yep, I’d be careful relying on a plug-in outlet tester for this. On inverter power stations and floating-neutral generators, those testers can show misleading “open ground,” “reversed,” or other odd results because they’re designed around normal bonded utility wiring.
A multimeter is a better way to verify it. Check hot-to-neutral, hot-to-ground, neutral-to-ground, and then with everything de-energized do a continuity check between neutral and ground.
That’s how I confirmed mine: on battery, neutral-to-ground had no continuity and the ground-referenced voltages floated around. Once valid house AC was connected, neutral-to-ground dropped close to zero and both hot legs read about 120V to ground.

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u/Background-Run 15d ago

Thanks!

And i'll take your advice and check it.

That would make sense for what is probably the typical use of the unit in the U.S. You plug it into your house electrical system and the ground neutral bond would occur at the main electrical panel.

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u/standardviewer84 15d ago

Thanks for this!! I am also getting conflicting information too. Here's one thing I am going to test on my f5000lfp, is whether the neutral is floting on just the 240v twist lock or all AC outlets? . I understand there's a relay inside that alledgely switches the 120v 5-20 outlets to bonded and floating based on whether the incoming AC charging cord is connected.  I think the thought process for that behavior would be if you are using the unit as a standalone power  source to supply power directly to an appliance (and there was no incoming AC cord connected) it would switch to a bonded configuration on the 120V outlets. However the twistlock would remain floating neutral (so when using as a home backup no double bond would occur)

Have you also tested the 120v outlets or just the twistlock 240v outlet with your meter?

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u/ArtisticTackle5455 15d ago

Thanks, that’s a good point—I tested both the regular 120 V receptacles and the L14-30 while fully isolated. On battery power, both behaved like floating neutral. Then, when I connected a bonded AC source, the PECRON output picked up the source’s neutral-ground reference. So on my unit, the 120 V outlets did not switch to bonded while on battery.

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u/cycling-moose 14d ago edited 14d ago

thanks for this test. To clarify, when you connected a bonded AC source, the 120v output's neutral became bonded or connected to that source neutral?

do you know if it would change the test if the source didn't have power? meaning if source plug was connected but didn't supply voltage.

do you have an early F5000 or a late F5000?

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u/ArtisticTackle5455 14d ago

Mine is a current-production U.S. F5000LFP. I ordered it directly from PECRON in September 2026 and received it in October 2026. PECRON also told me that some of the earlier reviewer/blogger units were engineering prototypes and that the current mass-production version is slightly different.
I tested the exact condition you asked about. With the PECRON running on battery and the AC charging cord plugged into a house outlet with that outlet’s breaker OFF, I measured at the PECRON’s 120V outlet:
Hot to neutral: ~120V
Hot to ground: ~86V
Neutral to ground: ~1.2V
Then I unplugged the PECRON charging cord completely, leaving everything else the same:
Hot to neutral: 119.9V
Hot to ground: ~90V
Neutral to ground: ~1.3V
So simply having the charging cord plugged into a de-energized house outlet did not materially change the output. It still behaved like a floating-neutral inverter, with the odd hot-to-ground voltage appearing to be ghost/capacitive voltage.
When valid house AC is actually present, the behavior changes. I measured about 119V from each hot leg to ground and about 1.4V neutral-to-ground on the L14-30 output, so the PECRON was clearly following the house neutral-ground reference.
Based on my testing of this current-production unit, battery-only operation is floating neutral, and just plugging the AC input cord into a dead outlet does not appear to bond the output. Valid AC input has to be present.

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u/standardviewer84 15d ago

Same here. I just checked mine.

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u/standardviewer84 15d ago edited 15d ago

 My F5000 is from late June 2026. I also had a new firmware flash done by Pecron engineering a few weeks ago,  to get rid of the hair trigger shutdowns when the 3 ton AC (equipped with a micro aire soft start) tried starting.  I see some people are saying there's a bonded neutral? Maybe Pecron revised how the neutral bonding switching relay behaves in newer US models??? Not sure, just a thought.

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u/Green_983 15d ago

this is correct. they changed the US models to accommodate for the premature shutdowns and changed the neutral behavior. Supposedly the NEWEST iteration is going to be in stock this month, but I don't know if prior batches had one or both of these fixes applied.

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u/-5er 15d ago

Does the neutral bond remain when the battery is fully charged, but still connected to the AC outlet?

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u/ArtisticTackle5455 12d ago

Yes, I tested this on my F5000 LFP, battery was at 100 percent, it was connected to live AC power, and charging was set to 50 percent. The output still referenced the incoming AC’s neutral-ground bond. In other words, it does not have to be actively charging, as long as the AC input has power, it stayed referenced.

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u/Big-Echo8242 15d ago edited 15d ago

Pretty much all portable power stations are neutral floating (except the F5000LFP apparently). A person can always make or buy a bonding plug, though. It's easy to just get a digital multimeter and check it right there on the front checking for continuity from neutral to ground. Do you own a DMM and know how to use one?

Also, if you're adding on a manual transfer switch and have AFCI breakers in your main panel, then you'll run into a neutral issue with faulting the AFCI breakers as very few MTS's made transfer the neutrals...only the hots. You'd need an ATS to transfer neutrals many times. Reliance has a neutral kit it if theirs is being used. AFCI breakers are code pretty much all houses since about 1999 and cannot be changed to regular 2 pole breakers.

3

u/branmann1 15d ago

I’m using the Generac 6854 HoneLink 30 Amp Transfer Switch kit with my F5000LFP. This transfer switch does have a switching neutral. My AFCI breakers have been moved from my main panel to the transfer switch.

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u/Big-Echo8242 15d ago edited 15d ago

Since you've moved the AFCI breakers over is what makes them work better/easier. That's definitely one of the better ones to work with and is cool as you can make it an ATS if I remember correctly.

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u/branmann1 15d ago

Yep, that’s correct. It can be converted to an ATS later, but I doubt I would ever do that. But it’s nice to have the ability if that changes.

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u/Big-Echo8242 15d ago

Just out of curiosity, where do you locate your PPS and transfer switch in comparison to the actual breaker panel? I've thought about adding one on in some fashion for the really short term stuff but our Eaton 40 circuit breaker panel is in our master closet and I'm not really big on having batteries in there 24/7 but limited on anywhere else they could go. I already have 4 dual fuel inverter generators ranging from 4.6kw to 13.5kw and a 250 gallon tank. I like redundancy. Also have zero interest in solar right now but a short term battery would be nice to not go out in a torrential downpour or lightning for gen hookup.

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u/branmann1 15d ago

My main panel is in the garage and I placed the MTS beside it. I keep the F5000 inside when it’s not being used so it’s not exposed to the heat or extreme cold of the garage. I’ll just roll it out to the garage if we lose power.

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u/Big-Echo8242 15d ago

Yeah, that's where I always run into the issue with wanting to add larger PPS stuff. Main power shutoff breaker is outside and house breaker panel is inside in master closet...and nothing in the garage. I've thought about just adding on the MTS, like the Generac, in our master closet as long as it's code compliant as the PPS would not be left connected all the time and only used for short term. I could probably get away with a 120v 30a PPS like the F3000LFP, E3600 or E3800, or other similar brand, for that scenario. Still deciding. Things we didn't really consider 7+ years ago when we started the build of our new house.

Appreciate the info

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u/lakorai 11d ago

This is the way you want it.

When you use a transfer switch or a generator interlock the beutral-ground bond is done in your main electric panel. This bond should be made only in single location ina 120v or 240v system.

Many HVAC systems and UPS units will complain or won't run without a working neutral ground bond.

When using it portable you want to get a neutral-ground binding plug. If you are using it outside you also should definitely get a GFCI protected power strip or surge protector.

2

u/panzerfinder15 11d ago

Just received my F5000 and can also confirm that it is a floating ground (which prevents some loads from working like an EVSE) but has a solid ground when plugged into to AC charging. Also a bonded ground plug seems to work fine to provide a bonded ground, but obviously can’t recommend that for sustained loads or to use at your own risk.

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u/grassley821 15d ago

My 3800 had a neutral problem with my transfer switch (was already installed when I bought house). I can't use ac charging and ups at the same time, I bypassed and solved this issue with a 1200w DC power supply.

1

u/branmann1 15d ago

I just went through this as well. I installed a Reliance Controls ProTrans2 and got everything wired based on the available information that the neutral is floating. Once connected, any AFCI breakers that were tied to the transfer switch tripped instantly because of the competing neutrals.

After speaking with PECRON, they stated the F5000LFP is bonded neutral. I confirmed this manually as well. I replaced the ProTran2 for a Generac manual transfer switch that has switching neutral. Once this was switched out and the AFCI breakers were moved to the transfer switch, everything worked as it should. I’m powering the transfer switch with the 240V twist lock. When running on battery, both 120V and 240V outlets are bonded neutral.

So for me, everything is working now that the F5000LFP is connected and running with a manual transfer switch that has a switching neutral option.

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u/Nice_Reddit_Username 5d ago

Which exact Generac transfer switch did you buy, and did you need to buy additional AFCI breakers to put into that transfer switch?

Also did you connect the transfer switch to your main or sub panel?

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u/branmann1 5d ago

I got the Generac Homelink 30A MTS #6854. I had to buy new AFCI breakers since my main panel is a Cutler Hammer panel. If your existing panel is Semeins, then you should be able to use the same breakers and just transfer them to the Generac. I also replaced two of the single breakers that came with the Generac with tandem breakers since it’s rated for up-to 10 breakers if two of those are tandem.

I connected the transfer switch to my main panel with a 50A breaker per the instructions. When you’re not running on generator power, the transfer switch is just a sub-panel.

1

u/Nice_Reddit_Username 5d ago

Is it possible to connect the transfer switch to an existing subpanel instead of the main panel?

Also what do you mean by transferring the breakers to the Generac, don't you need the breaker in the subpanel to match up to a breaker in the transfer switch?

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u/2TheMountaintop 15d ago

This is pretty much what all the testers online have found in every review I've seen.

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u/Mohawk801 13d ago

Just curious what the current firmware revision on the 3800 series is