I do not have my fast charger yet, so If the above figures are correct, It will take 3960 running watts. A 4K gen set wont do it with 20% head room. IMHO YMMV
240V@ 3,300 watts= 13.75 amps
3300 watts + 20% (660) = 3960 running watts, not surge.
I see another post by Bloak stating he is...