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Hi Paul, it is a tad more complicated than that. It used to be 44c/kw exported back into the supply, but the Govt in their infinite wisdom decided to do away with that figure here and now it is 16c/Kw exported back. However if one had already been connected to the scheme before they dropped back the feedin tariff, they stayed on the old rate, and I believe it is valid until the mid 2020's here in SA. I get an extra 8c/kw because I am with AGL, so for every Kw I feed back into the grid I get 52c back. However for every Kw I use I get charged at an increasing rate starting from 28c/kwh for the first 300kwh used then around 32c/kwh for the next 900kwh used and so on up to around 38c/kwh for the really big user.
The figures you used should read not produced, but exported, dont forget you are still using power when the sun is up and the panels are generating, and the house takes the power from the panels, and what is left is exported back into the grid,or if you use more than is being generated, you then import power from the grid, so based on your example you would need to export 3kw back into the grid which means your panels may have to produce up to double that taking into account your usage during the hours of solar generation. Other factors come into play as well, eg clouds, weather, time of year, trees, house orientation, roof pitch etc. I was told by my installer that here in Adelaide we get on average 7.1hrs of sunlight a day over the year, that is capable of producing power, whether there are clouds etc around, this can vary, but it is the average here at least. As an example, I have a 4.5kw setup, and in the peak during the summer I generated 32kw on a cloudless cooler day, it dropped back a few percent on the really hot days. Now with the sun further north I am lucky to produce 20kw on a clear day. This will probably drop back to around 15kw by mid winter on a clear day. There were a few days when the weather was particularly overcast that I did not export any power into the grid in fact the panels were lucky if they generated 2-3kw total during the day.
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