POwer sharing with Honda EU2000i

Simply put... It's illegal.. Against every electrical code NEC, state, and local municipal, And dangerous
Also
Any shore voltage so low that you can't start the A/C, will damage the compressor when you run it after disconnecting the generator
We are all aware of campgrounds with low voltage that are able to start the a/c, then burned out running A/c units
Voltage so low that you can't even start the a/c , is fool hardy to even run it, much less sync a generator to it
Run the a/c from the Honda, or try using an auto transformer to boost voltage
Switch Every thing you can to lp
Fridge will not stay cold on low voltage power

I'm not meaning to encourage this idea, but want to note that if backfeeding the utility power was illegal, there are millions of solar systems out there in violation. From the technical viewpoint, I'd guess it wouldn't work very well unless the utility voltage is on the high side, which I'm assuming it isn't. The eu2000i output voltage tends to be about 126 to 128 under light loads, and around 115 at maximum output. Power will flow from the higher voltage point to the lower voltage point. The best case IMO is that the eu2000i would be running full bore to supply the air conditioner, with the utility providing the "assist" power. The worst (and most likely case) is that the eu2000i would attempt to power the grid and trip out from overload.

I cannot find anything either supporting or refuting this idea.

Hi,

The Xantrex inverter is not a true hybrid. i.e. it does not do "load support" the way the Magnum, Victron, and Outback units do.

Xantrex simply shifts the entire load from the external power to the inverter and battery bank. There is no "blending" of power.

I know that the Magnum "load support" does not normally do "voltage support". It can be forced to do so by deliberately "dialing down" the available shore power input levels, but that is a balancing act. Not too many battery banks can sustain a 60 to 70 amp load for a long time.

If the OP wants to "do this right" he may need an autoformer, and a hybrid inverter/charger that allows dual power inputs. It is not going to be cheap.

It could potentially damage the Honda. It's a violation of the NEC. It could potentially electrocute a lineman if there's a grid outage while you're doing it. There are transformers that can boost voltage and inverters that can support the grid. Either would be a better choice. I wouldn't risk the equipment or the liability of your idea.

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Might sync up but the power sharing probably will not go well. The Honda ramps up power as voltage sags along a specific curve. I would not risk my Honda. Also not legal or in compliance with NEC to back feed any utility power. (except with the proper approved equipment including grid-tie solar and possibly others as approved by the utility and NEC and has nothing to do with this thread) Honda must be separated with a transfer switch and that defeats the purpose.

You would be better served with a battery powered inverter designed for this task. You can set maximum amps to draw from utility power and the inverter combines power and provides the rest from the battery. When there is extra utility power available the inverter will recharge the battery. Magnum, Victron, Xantrex all have something that will do this.

Could be your air conditioner needs a start capacitor but you really should have dedicated 20 amp minimum circuit.