The variable start timer is a standard feature on most small marine AC units where the manufacturer would reasonably expect more than one unit to be installed on a boat.
If you have multiple AC units that are starting at the same time, dig into the manual. You will most likely find a way to alter the timing so they stagger-start when powered up at the same time.
Climmia, Cruiseair, and MarinAire--among others--have this feature.
Grand Bahama Is.