This is a companion discussion topic for the original entry at http://reprage.com/post/39698552378/how-much-power-does-a-3d-printer-use
Your math doesn’t really make much sense. 26.5 - 28.5 => 2?
=> Is used when you can’t use =.
And as far as my math knowledge goes, 26.5 - 28.5 = -2.
Nice catch, thanks for checking the calcs - should be all fixed up now.
How are you getting the data from the watt meter?
Didn’t use any fancy data collection. Just sat there, and every minute looked at the meter and wrote down the reading. (Just typed it into a plain text file).