EG4 6000xp in three phase?

Perfectly normal for 3-phase with L1, L2, L3 all 115V relative to N, you get two legs L1, L2 and N.
120 x sqrt(3) = 208V, 115 x sqrt(3) = 199V.

That voltage between legs can vary a bit if loading changes its phase slightly.

They would only add up to 240V (or 230V because each is 115V not 120V) if 180 degrees apart. That would be split-phase.

The wattage you can pull at 202V will be less than the sum of inverter wattages, because current they can produce is the same (same heating of transistors and inductors) but voltage is out of phase. 202V / 240V = 84% of wattage available at 202V. But with separate 120V loads they could supply 100% of rating.

This drawing shows secondary windings of a transformer as if they were physically at 120 degree angles to each other, but is meant to represent AC waveforms at 120 degree phase shift from each other.

Note on the waveform that if you draw a vertical line and imagine putting a volt meter where the vertical line crosses two of the traces, it is never at the peak of both. (trace passes through Vpeak, but for A/C we quote RMS.)

Hedges said:

Perfectly normal for 3-phase with L1, L2, L3 all 115V relative to N, you get two legs L1, L2 and N.
120 x sqrt(3) = 208V, 115 x sqrt(3) = 199V.

That voltage between legs can vary a bit if loading changes its phase slightly.

They would only add up to 240V (or 230V because each is 115V not 120V) if 180 degrees apart. That would be split-phase.

The wattage you can pull at 202V will be less than the sum of inverter wattages, because current they can produce is the same (same heating of transistors and inductors) but voltage is out of phase. 202V / 240V = 84% of wattage available at 202V. But with separate 120V loads they could supply 100% of rating.

This drawing shows secondary windings of a transformer as if they were physically at 120 degree angles to each other, but is meant to represent AC waveforms at 120 degree phase shift from each other.

Note on the waveform that if you draw a vertical line and imagine putting a volt meter where the vertical line crosses two of the traces, it is never at the peak of both. (trace passes through Vpeak, but for A/C we quote RMS.)

View attachment 222412

View attachment 222413

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Thanks for the explanation. We are supposed to have a USA split phase system. We live at a condominum, is this normal in the USA?

Yes, condo complexes and apartments represent a significant load.
If connected to split phase, that would be a large unbalanced load on the utility's 3-phase distribution system.
So they are fed 3-phase, and each unit gets two legs.

Everything should work fine. Motors like A/C will draw higher current to produce same power. Heating elements will draw less current, less power. Most major appliances work at both 208V and 240V.

All you should have to do is configure your inverters for it.

The US has a 3-phase system, at various voltages. If you see transformers on a power pole, typically 12kV delta is shipped around, and 12kV 2 wires go to a transformer, stepped down to 120/240V split phase. The derived neutral is grounded.

Most large customers get 120/208Y or 277/480Y. Those can also be run through a transformer to make 120/240V, more likely from 480V since two legs of 120/208Y is good for low voltage circuits. 277V is also used for lighting circuits.

Consider yourself lucky. You could reconstruct 3-phase if you wanted for shop tools, just adding a transformer. Those of us with split-phase can only get 3-phase with an inverter. I asked PG&E to put in a transformer and give me 3-phase from a pole 150' away, and they estimated $150,000. But with a condo, you may not have a garage for a shop.

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@Hedges the EG4 6000xp or the 18k will work fine under this grid configuration for UPS/Backup and charging my EG4 LL v2 battery rack?

"OUTPUT VOLTAGE 120/240VAC; 120/208VAC (L1/L2/N required)"


"OUTPUT VOLTAGE 120/240VAC"

According to these data sheets, only 18kpv, not 6000XP. Double-check with vendor.