Wouldn’t know much about electrics. Just said I chance here first.15kv transformer coming in the shed. I used do on site blasting before and it was always a 260 cfm compressor used I know if you run a smaller nozzle a smaller compressor will do.
I got my mobile comp for 150 quidI bought my Ingersoll 130CFM for £1600. It had low hours but the all the towing kit ie wheel/draw bar had been removed so they could go on lorries. That didn't worry me as it makes it less nickable. It's proper job, 1600 Yanmar diesel in it. I've got a 100L buffer tank and it fills it from empty to 100PSI in about 6-8 seconds. My cabinet needs 25-30CFM and it is just cruising with the cabinet flat out.
It's been said before you can't set up blasting for any kind or through put on the cheap.