the 110v one needs a more powerful genny , i tried to go cheap and had to take it back to upgrade , if you go for a 240v one you can get away with a Loncin lc6500 generator £487 delivered if you go for the 110v then you need a a loncin en6500 around £635 or a honda around £1000. I went for the 110v for safety (you can die using 240v (apparently) and also so i can be safe in the knowledge that if i am ever asked the question on commercial contracts then i can be sure that my answer will sens the H and S guy away smiling.