Craig, how much were they charging you for the system? I am also in Aus, have had it installed for a week now and it is great. By coincidence we had a blackout today, only wish I connected more to the backup circuit as it is no where near its max load. Got my 10.4kw and hybrid inverter for just 7k.
The Alpha Ess Hybrid Inverer is the Goodwe Inverter just rebadged.
J