Hi
Power factor calculation comes when dealing with apparent power that is kva which is used for marketing.
Watt is real power and dont need powerfactor .
3kva means 3000 x 0.8 eq 2400 watt.
Max current = 2400/235 or 2400/220
My gen has 2200 watt max and max current is around 9
Which is also written on it.