Thats about right for a sub-1kw (.5 - 1HP) VFD. You must match the VFD to the motor.
Nothing is ever simple eh! is it just the max curent that is the issue when matching it to the motor?

Looks like I will have to research this a bit more, know of any good sites

Does this look like a good VFD,
http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=230343452299

Is 1.5K enough for decent mill? what size are you running your mills?
Thanks