Here are some statistics for my PV system as at March 2013 (Since June 2011).
Total generated since June 2011 is 8360kWh. I have exported 6994kWh and self consumed the difference, 1366kWh. I have imported 2780kWh for the same period.
The 6994kWh I have exported at $0.66 / kWh has earned me $4616. Using the old 2011 rate of $0.29711 / kWh for peak import the 1366kWh self consumed has saved me at least $406 (the price is now $0.3410 / kWh). That’s a total of $5022 since June 2011.
Total imported for the same period is 2780kWh. If I add the 1366kWh of PV power I self consumed then my total consumption is 4146kWh from June 2011 to March 2013.
I have managed to export 83.6% of what the system has generated and the PV system has covered 33% of my total consumption.
ROI is going to be under 3 years thanks to the $0.66 export premium feed in tariff (PFIT).