I'm not sure but my common sense says that an ac would trip :-
-- when cooling is achieved or thermostat is faulty (not in this case)
-- Compressor is weak (it should trip more with higher acceleration, again not the case here)
-- Voltage drop (probable reason)
Now for lower voltages it could be battery, generator, cutout or similar fubctioning item, windings of compressor (magnetic clutch type item) and a sparking ac on/off switch ( this is all i could think of so far)
And if all is well then it could be the computer thing i think it is called ecu but i'm not sure how it controls the ac or its tripping just a guess