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I just signed up for a 5 kW system on my roof and a 2 kW stystem on my mother-in-laws place. I don't think that she will ever get a power bill after they're installed as she live by herself and doesn't use much power. At home we use a lot of power hence the upgrade. Not cheap in the first place, but better in the long run. In NSW you get gross feed in tariff, which will pay the system off in no time. If you can afford to make the investment, go for it.
Cheeers
Stuart
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