You'd need a genset the size of a car to run one of these. They pull 900 amps at startup on 208 volt 3 phase. On 240 3 phase, it's around 500 amps on startup. On 480 3 phase, it's much less at 200 amps to start the siren. That 50 hp motor is a pig and requires so much energy to start. Good to know!...