I recently had some electrical work done on my home to bring it up to code - there was no GFCI protection in the kitchen or bathroom when we bought the house, so our electrician fitted GFCI breakers at the panel. He did not use the GFCI outlets because he explained that our existing outlet boxes were too small to fit the extra size of a GFCI.
When I plugged in my generator to my transfer switch though, and flipped the main breakers in the transfer switch from LINE TO GEN, the GFCI breakers in my main service panel immediately tripped.
I have read that this may have something to do with the fact that most portable generators come with the ground + neutral bonded to the frame. Apparently, this makes the generator a SDS (separately derived system) compliant with OSHA for use on job sites. I can confirm that my generator is like this. It says so right on the power panel.
However, when connecting to the house, I have heard that the ground + neutral are actually already bonded together in the panel, so you should "float" (disconnect) the neutral wire at the generator. However, I have also heard this increases shock risk on the generator side.
I am not positive that this is why the GFCI breaker in my main panel is tripping, but it's a hunch. It could just be that the breaker doesn't like the power signal coming from the generator.
Regardless, I'd still like to have power to my kitchen from the gen.
Any suggestions as to why this could be happening?