So in other words Bluetti inverters like the AC300 have a floating neutral?
This doesn’t make sense to me. Everything I’ve read states that bonded/GFCI generators require a transfer switch that also switches neutral which the AC300 also seems to require so wouldn’t that mean the AC300 has a bonded neutral?
I’m pretty sure the AC200MAX has a floating neutral. If I test it with a outlet tester it shows an open ground.
As far as I understand a portable generator with a floating neutral should have the neutral attached at the panel and should not be switched. I’m not an electrician though.
The issue here only seems to be when you charge the AC300 with utility power that is on the same circuit as the transfer switch. If you are using it as a generator and powering it with solar then you won’t have an issue with a transfer switch that does not switch the neutral.
However, if you want to charge it with utility power and use it at the same time then you need to isolate the neutrals.
As for bonding the case to the earth with a ground rod - that is simply impossible with the AC200MAX as it’s a plastic and rubber case. There is no ground screw to attach to anything.
I think it’s important to note here that the user EZGeneratorSwitch is here to try to sell a product. Even in reply to Joules22 who said they did not want a transfer switch, the response was to buy a transfer switch 
dr_torch
We are here to help endless customers who contact us with either a issue of burning out their unit or “how do we connect”
We suggested Joules22 “who asked us” what they should do >>>> NEVER did we say buy a EZ generator Switch… there are many on the market.
You said" However, if you want to charge it with utility power and use it at the same time then you need to isolate the neutrals." This is a code violation just a FYI
It has a floating neutral which by NEC requires that neutral be grounded BUT >>> according to dr_torch there is a issue connecting it to standard power (we believe he is correct). There in lies the issue, You are grounding the neutral side of the unit per NEC but the unit will fail. We have spoken to Bluetti trying to get answers for our customers and they have as of this date not responded.
Well, @EZGeneratorSwitch I don’t know about everybody else but I am totally confused.
First I should mention that I do not live in the USA and so NEC does not apply to me. But that aside, in your first post you wrote the following:
“You need to use a switch that transfers both legs, this is a requirement for GFCI, Arc fault and combo breakers also.”
So just so we are on the same page, I take that to mean that I need a transfer switch that transfers both the hot and the neutral.
Now on your last post you write:
“It has a floating neutral which by NEC requires that neutral be grounded”
So this means that we should not transfer the neutral?
As far as I understood in Canada (and again I am not an electrician here) if you have a generator with a floating neutral you switch the hots and the neutrals do not get switched.
If you have a generator with a bonded neutral then you are required to switch the hots and the neutrals.
@BLUETTI - can you tell us if the AC200Max and AC300 are floating neutrals or bonded neutral units?
Hey DR…don’t be confused because you are reading it correctly. Even our Canadian peeps ask these questions. We are familiar with your code also, as you can see we are approved to sell in your country. Here goes >>
DR go to our site Ezgeneratorswitch. and look at the fourth video down on the left " simple explanation of bonded and floating neutral generators"
Glad you are asking these questions because you are helping others.
Then why does the AC300 have issues if a transfer switch that does NOT switch neutral is used?
I can only tell you my best guess electrically NOT from Bluetti. IF Bluetti is producing two 60 volt legs instead of a 120 volt leg and a neutral that is bonded to earth ( per the NEC) Then anyone bonding their “neutral” which has 60 volts on it would be shorting that leg to ground.
Many power stations are set up as completely floating systems and integrating them with household equipment such as a heating system is not possible. Cord and plug connected equipment (for now) works fine but in the near future all equipment will be looking for that neutral bonded connection ( like new furnace systems). That bonded neutral connection “saves” equipment from faults and protects its users.
i looked at your product EZ Gen Switch but the problem is you only offer single circuit switches. why not a multi circuit switch? most people aren’t gonna go thru the hassle of transferring to sogen powered switch for just 1 circuit. my 2 cents.
I would guess their product was built with gasoline generators in mind for people that used them in emergencies but wanted to run some hardwired appliances.
In my mind it’s the furnace. In North America (I’m keeping in mind a global audience here) we mainly run natural gas furnaces that code says are to be hardwired to the panel via an emergency shut-off switch (which is just a switch).
So you cannot just run an extension cord and a 6 breaker transfer switch needs to be wired at the panel. Their switch could be wired at the furnace shut-off switch and then the homeowner simply runs an extension cord to it in an emergency.
In my case I actually want to run some of my house off solar all of the time.
ha-ha all the more. Sogen products are not big ,long lasting power delivery items. So doing individual circuits actually makes sense. The design intent 12 years ago was giving people the ability to transfer essential circuits without spending a fortune…in todays world transfer approved switch under 100 is a home run. Sales in USA and Canada clearly prove that
dr_torch…correct! 12 years ago no body was using Sogen…its grown which is great. Our product services homes , traffic lights, solar systems and emergency circuits.
For 4 of 5 circuits i instslled a 3p3t switch by breaking the house wire into one input on the switch and jumpered the 2 ouputs to the applience. The other side is the Bluetti input. Total isolation from house for ALL 3 wires. I used 12ga wire from battery to switch. It’s a manual operation
If a licensed electrician did that everyone would complain, homeowner does it and its fine
The switch is considered as a junction box. Switch rating is 600 volts 42 Amps with total isolation of both inputs and the inspector accepted it after he chacked the wiring. I retired as a Senior Controls/Maintenance Engineer
Great I was a NEC teacher and I can’t seem to find where a switch would be considered a junction box, because that doesn’t exist. Glad your inspector wasn’t looking for a “label”
Bluetti will not let you bond their neutral to the house system, if you convert the switch that will bond their neutral so there fore use the switch as received .
This is a similar situation I am having some problems with.
My AC200MAX won’t fire up my Trane furnace. It will start the fans but will not ignite. I think that is because Bluetti batteries are considered to be “Floating Neutral” and for safety reasons my furnace won’t allow that connection.
I’m looking at a simple fix by using a "NEMA 5-15a (125/15A) GROUND NEUTRAL PLUG.
Is this a recommended safe fix.
I am also concerned because the plugs on the MAX are considered 125V/20A is it safe to use the 15A plug .
This is a brief description of the product I am considering to use:
Ground neutral bonding plug for generators with floating neutrals. This will solve a missing ground/neutral problem with EPO/EMS units and generators. By Hughes
Any thought to clarify this would be appreciated.