Power to gutter vac

Gents

 Gutter vacs seem to be a hot topic at the moment, and I'm considering dropping my toe and getting one. Just wonder how you go about powering them, do you all use generators,  or do you use the occupiers 240 volts

If it's the householders do you get many issues  with that, them needing to be in , have outside socket etc

Each job is different, if you're going to do it properly then buy a big enough genie then the customer doesn't need to be in

Ive used both, obb i prefer custys mains but have a 5kva gennie if i need it.