Hi,
i've been looking around for a 3kW solar power system and found these guys the cheapest for Melbourne
their website bestvaluesolar.com.au
they have a 3kW solar with delta inverter for $3700 exGST which seems to be the cheapest
i'm tempted to go with them but unsure as there's no reviews on them
your comments sorted
A friend of mine work at solar company. Their website is accessenergy.net.au You can give a call and see what they offer.