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Depends on what your average consumption is Trevor. We have a 1.5kw system installed in Sept 2010 and so far we have not paid a cent in electricity and current in credit by $250. This boils down to several factors:
1. Our household of 2 adults and 2 kids are not home during the day.
2. The Vic premium feed in tarrif is 66c a kwh, compared with "importing" price of 23c a kwh for peak (mon-fri 7am-11pm) and 16c per kwh for off peak (all other times and weekends). So we use mostly off peak electricity.
3. We did other green measures such as powering off at the wall, solar hot water (gas boosted), insulation etc, which reduced our demand for air cond and other demands.
Pricewise the system is cheap. But you may find that if you spend most of your time at home, then the savings may be minimal.
A word of advice, upgrade to a better inverter, it is the heart of any solar PV system. Sunny Boy and other German branded (made in China) have good reputation. My inverter is a Latronics brand (Aust made). As for panels, 90% of them are from China, the other 10% are from Japan and Germany and command a 30% premium, but not too much difference in quality and performance IMHO.
Bo
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