Powering an electric dive compressor

[Sawbonz]

We hope to sign the contract on a Leopard 45 this week and will outfit the boat with a compressor. I don't wish to have the noise, maintenance or fuel consumption of the gas or diesel models and a place that installs dive compressors has told me that a 9kw generator isn't enough to power the compressor. Huh? I have read here that several are doing it, though a search is not specific on how you are wiring the electric one.

In addition I plan to have two 3kw inverters on an lithium battery bank and lots of solar. Can you tell me how to get the oomph needed to start the electric motor on the compressor so that I can start sourcing parts and planning?