View Single Post
  #13  
Old 09-30-2011, 09:17 PM
mrennie's Avatar
mrennie mrennie is offline
Ultimate Warrior
 
Join Date: Dec 2002
Location: Cochrane, ON (we have polar bears)
Posts: 1,584
Default

I would agree with that, but only if the supply voltage is really 220V. Isn't it really more like 240V? (it is here in Ontario)

1HP=768W

However, most single phase motors are only ~70% efficient, so taking that into account:

768W / .7 =1097W

1097W / 220V =4.99A

If the supply is actually 240V then draw per HP is actually 4.6A

I have a 7.5HP 80 gallon compressor and it draws 37A while running, which works out to be 4.93A/HP.

__________________
Michael


1970 Oshawa built 1 option Judge. 24 year restoration/upgrade project finally finished!

1979 Trans Am - low-buck drag car project for when I retire