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Note:

It's very rare that any of the equipment will operate at full wattage at any given time.

True example:

Nameplate wattage for equipment 19,600 watts - 66,895 btuh
Actual Measured amps/volts 8,592 watts - 29,325btuh

Historically the equipment actually runs at 33% to 50% of the nameplate.

If you have a tight budget or don't anticipate additional equipment in the future you might want to look at your actual running amps and volts to calculate the wattage.