Quote Originally Posted by Edward View Post
Well, for instance, the current at the input is relevant to me as I want to have some idea of how much current the whole system is likely to draw in total when at full blast
Motor Stall Current multiplied by one over the VFD efficiency or the maximum rated current draw for the VFD will give you a far better idea of the maximum current under heavy working conditions than spinning up the motor and sticking a meter on the mains input.
Maths and manufacturers data are your friends here, not a meter and a finger in the air ;-)

- Nick