Small Generator Can we have bus coupler between two Generator

this is small? do you mean 1000 VA?

no

if you really mean small generaters you will bot be able to keep phase, frequency, amplitude, etc. in sync. please list make and model

Short answer, NO!

Parallel them out of phase and you run the risk of tearing a generator off its mounts; breaking a drive shaft; and tripping a breaker on over-current.

'Synchronizing equipement' can be as simple as two voltmeters and a synchroscope (special meter). Lacking a synchroscope, a couple of lights connected properly can suffice.

But once paralleled, if the regulators/governors aren't set-up right, one machine can assume all the load and actually start driving the others as motors (and this is a *bad* thing).

daestrom

The small Honda inverter generators do have the ability to run themselves in parallel. Having never used them myself, I cannot speak to the details. They are small though, only 1 or 2 kVA in capacity, and intended for the homeowner market, so they ought to be reasonably idiot proof.

--Dale

Those work on entirely different principles. They are essentially DC generators with electronic inverters. The inverters are controlled by a microprocessor that includes algorithms to sense an already energized output (such as from a second generator output) and synchronize the inverter output to the existing AC.

A conventional synchronous generator is quite a different 'animal'.

daestrom P.S. I've wondered if one of those Honda units could be paralleled with the grid, but I haven't heard anyone try it....

You really should hire a professional engineer for advice on this. The fee an engineer will charge will be tiny compared to the capital cost of the equipment you have and compared with the value of electrical energy produced.

Bill