An evap cooler wouldn't be much good in the high humidity of NT.
Have you thought about the 12v air cond units like they have in trucks?
I had one in the last truck that ran off the main batteries and never ran them flat, so if you have a decent second battery setup you should be able to run one.
Neale
85 Range Rover Ute (Project in pieces)
89 Range Rover Classic (Black Thunder)
93 200tdi Disco,(OGRE)
96 300tdi Disco, DEAD MOTOR
04 Nissan Patrol with ALL the fruit
09 Cub Daintree Kamperoo
12 VE II Commodore Ute DD
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