Hi David,
Over here in QLD, I'm with Origin with a very old 1.5kW system at the old 50c rate.
Only recently, I found out that I was allowed LEGALLY to increase the 'amount' by 30%. I had 7 panels and the installers said i could have another 3. So I did
Much better intake. Get a 'full' 1.5kW for most of the day now.
If you're on the 6c-8c rates it may not be viable to pay (probably around the $1000), for the additional panels and/or the cost of a larger inverter. However, if you're on the 50c rate, it would be well worth it IMO.
Depending on how you house roof is laid out, you could put the 'extra' panels in a sun aspect that your existing panels don't get or lose out on as the sun chugs around. The best deal is to have a continuous intake throughout the day.
You keep your existing inverter, just add panels - within the rules
Whatever plan you're on, you may not be allowed to change your inverter to a larger kW.
Hope that helps.
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