I have just put a Compressor on my Cat - is petrol 4 stroke
6 hp motor
and whole thing is portable which is great as we have a locker that it fits in just fine- then you can pull it out and put in clean air/wind when you want to pump....
The compressor is identical to Bauer Junior..
Some purists would say -stay away from petrol - but I am comfortable as we need petrol supplies for the tender outboard
anyway....and the petrol motor
driven set ups are slightly quicker on the fill rates without having the hassles of gensets and inverter
Having just had a 3 week cruise
where I dived a lot of days twice a day - have to say wish I had done this sooner...
That is my first thoughts - hope it helps
Good luck and diving