Handy, aren't they?
ps
It's not clear from the photo but with any PTO generator you should try to keep the tractor PTO output shaft and the generator PTO input shaft exactly in line with each other. If there is an appreciable angle between the two you can end up with "lumpy" power due to the relationship of speed-vs-angle on the U-joints.
pps
I agree with the above poster (where he is concerned about operating the tractor in the garage) -- if there is a fire (either tractor engine or generator) you will not want that happening in the garage. Moreover, if in fact it is an attached garage, some CO will be entering the house even if you have the garage door open. For these reasons it's usually a good idea to operate the tractor/generator away from the dwelling.
ppps
My utility power was off for 12 days after Hurricane Sandy and the follow-up Nor'Easter. My PTO generator and BX setup allowed me to run the well pump and other "big" loads -- but the majority of my AC power came from a small Honda gasoline camping generator. This dual approach proved to be a useful combination since for about a week after the storm there were no gas stations open whatsoever. After a few days, folks with large (5KW and greater) gasoline generators were really handcuffed by the non-availability of gasoline.
Under my 2 generator scheme I was using about 1/4 gallon of diesel per day, and about 2 gallons of gas per day. Although this setup meant my wife and I were more or less "camping" in the house, the heat was on, the coffee was hot, and amazingly our Verizon FIOS still worked as well. Each afternoon I would start the tractor, and we would take hot showers and refill water stocks. The 25 gallons of gasoline and 20 gallons of diesel that I had started with at the outset of the storm meant that I was never in "fuel crisis". My tractor + PTO was operated away from the house, at my detached workshop. Underground conduit brings the generator-sourced power back to the house.
Wrooster