I have 200 amp service and don't even have 220, I installed it myself under the direction of professional Electrical contractors, and the county inspector. I believe him.
Volts x amps = watts, Period. You can re-arrange that any way you like.
Watts / amps = Volts
Volts / watts = amps
But if you really want to save $ on electric, you MUST get a Power factor correction Capacitor
it will save you 20-25% off the top if you are seriously mining
(The scam is electric companies actually charge by the volt-amp, and not by Kilowatt-hours) This corrects that.
http://www.eaton.com/Eaton/ProductsServices/Electrical/ProductsandServices/PowerQualityandMonitoring/PowerFactorCorrection/index.htmuhh, no.. you can't actually arrange them anyway you want. Only the first and second of your equations are valid, the third should be ( Watts / Volts = Amps )
Do you have data for your installation that shows you are getting a benefit from a PFC?