Hi eyeofthefly,
Its too high a wave(freq) for normal use.
If your house is 220v you could go across two phases,
and feed the lighting circuits only.
Don't use it to feed florries (strip lights),
use it for filament types only.
If your house is 115/110 then you could use one of the legs,
but only at about 3 Kw.
Again, only for filament lights,
the freq is too high for anything inductive or capacitive.
Some other items would work ok,
things that are not frequency sensitive like
an electric kettle (check power)
an electric toaster (unless it has electronics inside, some do)
electric blanket ? maybe
electric cooker ? ... its clock would not work right, check power.
There is no easy way to reduce the frequency from this unit
from 400 Cycles to match normal household 50 Cycles.
As Sebi says,
you might do better to rectify it to DC,
and use that.
That wouldn't hurt any florries, but it wouldn't work them.
That would work your filament lamps ok.
And if the rectifiers are big enough it would work a cooker ok.
DC might damage some items however,
so be careful with any motor driven items,
if they don't work, switch it off quick, and don't try to use it.
If it does work, switch it off after a very short time,
like three or four seconds, and see if you think its getting hot,
if ok, try a bit longer, some motors will run, but overheat.
Some motors will run OK. you'll have to see for yourself.
Before applying it to your house, check all appliances and
fittings are off. Anything left on might not like DC (or 400 C/s)
And there are some laws about switching generators to house
electrics. Sometimes Power Board officials have found cables live
when working on a fault, due to someone running a generator
elsewhere. They get the severe hump about that.
So make sure you isolate.
Best of luck with it, John