My friend at JT Solar, can supply 24V 180 watt solar panels at $999AUD each.

Brand: Suzhou Shenglong PV Technolgy
Type: Mono crystalline, standard 1600mm x 800mm
Eff: 17.5%
Model Number: SLSM-180D

As listed here:
http://www.cleanenergycouncil.org.au/in ... 090706.pdf
These solar panels confirm to IEC quality and output performance tests, and thus approved by the Australian government.

Beware of other sellers, selling cheap low quality alternatives, which are non-compliant.

I have a few of these panels and can vouch for their quality.

They also sell 85 watt 12v panels at $500 each, cheapest Ive seen anywhere.