I have an Onan 16kw diesel with a Cummins engine. It runs the whole
house, and fuel consumption depends on how I live...lightly loaded,
the set gets 2-4 hours/gal, but running the water
heat/washer/dryer/etc. will push it over 1 gal/hr.
I get amused at the gener-wrecks and hondas that say 4500 Watts! 6000
Surge! Yea right. Plug a 5KW load in and see what happens. Been down
that road...if it spins at 3600 rpm homey don't buy it.
My Onan will do 16KW all day long and as for "surge", it can do 21KW
for up to 30 minutes, by the rating plate. Don't know if that's true,
but I have slapped it with an 18kw load. The engine made that "I'm
working now" sound but otherwise it didn't care.
'Course it ain't cheap. I have a small business here and MUST have
juice always, so there was the justification. The set, tanks, and
controls cost about $10K. + what it's building cost.