inverter question

Hi All,
I've got a 200hz 220v 1Kw 4.3amps spindle motor for my router,
and made a trip to the local electric supplyer to get a inverter to
run it, to my suprise they sayd that I would need a 16amps inverter
to run the spindle becouse the start current is very high.
Well I do Know that they have a 7amps inverter for half the price
than the one they want to sell (16amps).
Question: would a 7 amps be enough to run this spindle or they want
to push a bigger inverter just becouse it's more money?
Does the 200hz have something to do with the high start current?
making it impossibe a 7amps invert to start it?

Thank's
Fogassa