At 1.5KW you can power it directly from a 13Amp plug and it should be fine. When wiring the spindle motor to the VFD use a screened cable and make sure it is grounded at the VFD. Dont run it until you have the cooling running or you will wreck the spindle motor. Personally I like to have the cooling water running before I start the spindle and also to have it keep running for a short time after the spindle stops. I have the 2.2KW version which will be fitted to my build and I am using an old Lincoln electric welding cooler for the job. If I can manage to get back into the shop to get it finished that is!

Ian