A customer is adding air conditioning to a greenhouse. They are installing 7 - 20 ton units, 7 - 30 ton units, 2 - 5 HP motors, 2 - 7.5 HP motors and 80 single phase blower units. The equipment is all coming from overseas and is rated at 220 volts, 60 hz. The existing service is a 1200 amp, 120/208 3-phase. They had a peak demand last summer of 84KW or 292 amps. The utility company said the transformer can handle up to 2000 amps. To come up with the calculated load I added up all name plate ratings as I was told the system would have a delayed start but will be running at the same time. The total new load I came up with is 449 KW or 1476 amps which I then added for start-up current to bring up the total additional service to 1600 amps. Is this the correct way of calculating or am I missing something? Thank you