I calculated it at 8,41A draw. Here's my logic. I = Watts/Volts = 1850/220 I = 8,41A With that in mind... 20A = maxWatts/220v MaxWatts = 220v*20A MaxWatts = 4400W Theoretically, not taking into account tolerance and quality of circuit breaker, you should be able to connect 4400w on a standard 2.5mm cable on a single circuit breaker without any hassles. You need to take into account other electrical devices running on the same circuit though. I would also not suggest that you fire up 20A at the same time, as may trip the breaker. At a full 4400w, there may be a need for staggered start of equipment. Sent from my CLT-L29 using Tapatalk