Hi there! I have here a CAT Standby 650 ekW 813 kVA 60 Hz 1800 rpm 480 Volts generator with CAT 3412C TA Diesel Engine. Im trying to come up with maximum apm load wich can be connected to this generator. What formula should I use for that? simple one W=V*A, where A=W/V good enought? Or there is some "underwater" things i should keep in mind?