Paddler Ed
Adventurer
Simpson Desert has already been crossed with a solar (and battery) powered 4x4 (roughly in chronological order of publication):
www.whichcar.com.au
www.unsealed4x4.com.au
www.unsealed4x4.com.au
www.unsealed4x4.com.au
So, from that it can be taken that:
-Need a lot of flat surfaces
-Decent batteries
-Light base weight to start with
-Sunshine
are all needed...

Solar-powered Suzuki
An electrically-driven Suzuki Sierra set to take on the Simpson Desert.


SOLAR POWERED SIMPSON CROSSING


SMASHING THE SIMPSON DESERT WITH SOLAR POWER


SOLAR POWERED ZOOKS VS THE SIMPSON DESERT

So, from that it can be taken that:
-Need a lot of flat surfaces
-Decent batteries
-Light base weight to start with
-Sunshine
are all needed...