No, you're definitely OK with running multiple inverters off the same DC buss as their **inputs**.If they were completely isolated with different battery's feeding them and each with their own sockets I think you would be ok
This discussion is fringing on the GFCI or RCD of AC circuits discussion which is another very confusing issue with the definitions of Hot/Active and Neutral/Live.No, you're definitely OK with running multiple inverters off the same DC buss as their **inputs**.
It is only the AC output side that should not be joined.
The simplest & safest principle is, no feeding external outlets, just plugging your AC load devices directly into outlet(s) on the appropriate inverter.
Next simplest / safe would be a surge suppressor / power strip plugged into that outlet, which of course physically cannot be plugged into more than one inverter at a time.
It is multiple inverters connected to a circuit of "built in wall" outlets (mimicking what's in our shore powered buildings) that is **absolutely** to be avoided.
All the DC negative return references should be a common "ground", being the vehicle chassis common, engine block, frame etc, while
on the AC side it can get more complicated depending on generator/transfer switching / connection to shore power circuits, and **very** important to get it right for safety, so best to use a pro except for super-simple setups.
But if your inverter install documentation specs that its chassis should be "grounded", that can / should be common to the DC / vehicle chassis reference as well.
Of course, none of those common / references actually being true "Earth Ground", that only happens at the single shore power connection point.
....which is what I do. Watching TV with shore power available projector is plugged into shore outlet and without shore to the other one. This post is my proof that I am still alive.Or just taking the load's plug out of one source (inverter, shore power, genset) and plugging it into the other.
Since each inverter controls or facilitates its requisite loads grounding, if the outlets are grounded to the inverter ONLY with the ground wire (not chassis grounded), then multiple inverters can be run simultaneously and to separate outlets.Absolutely 100% agree on and permanent AC wiring on the second inverter.
Absolutely disagree the "Magical part" of mother earth is that when and only when it becomes the reference for a power source there is a hot/active and neutral situation that is potentially fatal to a person standing on "mother earth".There is nothing magical about "Mother Earth"--it is simply a handy reference point for measurement purposes. It lets us pretend that voltages are absolute, when in fact they are as a practical matter always relative. But even this doesn't really work. Power engineers who design high voltage power transmission lines need to worry about creating significant (and occasionally dangerous) current flows in the earth. "Ground" has its limits even as a conventional "zero voltage" point.
A vehicle chassis is a perfectly legitimate "ground", and can serve exactly the same logical function as "earth ground". When we go to Mars, there will be a "Mars ground" as well. They all do the same thing.
It is only a recent thing that inverters have neutral/ground switching, many inverters are permanently neutral/ground wired, but most have outlets isolated from ground.Since each inverter controls or facilitates its requisite loads grounding, if the outlets are grounded to the inverter ONLY with the ground wire (not chassis grounded), then multiple inverters can be run simultaneously and to separate outlets.
My ProWatt SW600 offers protection with its single GFCI outlet on it. I use an extension wire from it to my desktop wall outlets. The outlets and their housing are isolated from the chassis/chassis grounding.It is only a recent thing that inverters have neutral/ground switching, many inverters are permanently neutral/ground wired, but most have outlets isolated from ground.
This is fine if there is only one outlet but is potentially hazardous if more than one outlet is provided.
If there is no ground or earth bonding between one of the live source wires before the GFCI then a live to ground fault on the load side will not trip the GFCI. Easy to test as GFCI breakers usually have a residual current test button on them and pushing it will test if there is a ground connection before it. This lets the potential for an earth fault after the breaker to go undetected, waiting for a second that is unlikely if there is only one outlet. Look up Electric Shock Drowning to see how deadly a poor earth connection can be.My ProWatt SW600 offers protection with its single GFCI outlet on it. I use an extension wire from it to my desktop wall outlets. The outlets and their housing are isolated from the chassis/chassis grounding.
These outlets run simultaneously with other outlets connected to a 3000W inverter. These outlets that are connected to this inverter are protected via the circuit breakers between the load and the inverter, and the neutral bonding grounding controlled internally.
Let me be the first one here to respond with/from actual experience....
... I run dual inverters. A 600W for daily desktop or entertainment, and a 3kW for doing the heavy lifting (and charging).
They both power the same physical AC outlets, but never simultaneously.
Their output and connection is controlled by a simple AC Changeover/Rotary Cam Switch.
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All of these complications are moot
if you do not wire mains power circuits and outlets.
I like to keep things simple:
99.9% of consumption is direct DC, no inverters
any AC load devices plug directly into their inverter
if there were an AC outlet, it would be impossible for it to be fed by more than one inverter
the only thing fed directly from shore power or the genset is the charger, and that just physically plugs in
if I had electric aircon, it would also plug in like the charger, but likely to a separate AC circuit or genset from the charger
I can't really follow what you are trying to say, but I am pretty sure you are confused.Absolutely disagree the "Magical part" of mother earth is that when and only when it becomes the reference for a power source there is a hot/active and neutral situation that is potentially fatal to a person standing on "mother earth".
The so-called ground in a vehicle chassis is rarely connected well to mother earth due to the tyres and as such a fault condition can have the chassis hot and dangerous with respect to mother earth. Then if that so-called ground fault is on the load side of the GFCI or RCD they will not trip unless there is a similar "ground" of earth connection on the source side of the GFCI or RCD to create a residual current return to the live wire feeding the GFCI or RCD.
Just like water, electrons circle or flow in the opposite direction in Auz, or south of the equator....I can't really follow what you are trying to say, but I am pretty sure you are confused.
Perhaps you are trying to describe the well-known "hot skin" condition that can occur as a result of certain mis-wirings of shore power connections. This certainly can occur. But, with a properly wired shore outlet and with a properly wired vehicle, the vehicle chassis is bonded to earth ground in exactly one place. The problem case requires a bonding to earth--just an incorrect one.
If, on the other hand, you are talking about a situation with no shore-power connection (and thus no bonding to earth), then no on-board fault can produce a "potentially fatal" potential between the chassis and earth, since it takes two current paths to do so, one of which would have to be referenced to earth.
I repeat: The logic of the situation is identical whether we are using the chassis or Mother Earth as the ground reference. a GFCI cannot tell the difference and will behave similarly. It would also work on Mars.
I apologize if I am simply not understanding what you are trying to explain. Perhaps a diagram would help.