I had one in a 1980 H33
Had a 3.5 kw diesel generator in starboard cockpit locker in this boat. While it was an older model, it was not that heavy. It did cause the boat to list to the right, I put an 8d battery on the left side of the boat, which made it ride lower in water, but evened things up. I removed it after a couple of years because on a 33 ft boat, running the generator, no matter how much sound deadening material I had around it, made a good bit of noise and a noticable vibration - I decided I would just use the air conditioner when I was at the dock and installed fans everywhere in cabin for use when anchored out. Personal choice, I would rather be warm than hear it running.