This determines the amount of electricity you’ll produce and depending on how much power you use in the house while the sun is shining, how much you’ll export to the grid.
The average system size installed in Australia at the moment is around 4kW.
This determines the amount of electricity you’ll feed into the grid and be paid the feed in tariff for.
If you want to be more accurate, play around with the feed in percentage in the advanced features. This can never be 100% accurate however so play with the slider and see the affect it has on the financial numbers to determine best and worst case scenarios.
This is the percentage of electricity produced by your system which is exported to the grid and which you’ll be paid the feed in tariff for.
If you’re home and using power during the day, you’ll use the power your system produces first and therefore export less.
If most of the household is at work or school during the day, then you’re export percentage will be higher.
Larger systems will export more than smaller systems.
If you’re feed in tariff is less than what you pay for your power, which is the case in most states, then you should try to shift your power usage to the middle of the day rather than evening. This can be done by using washing machines, dishwashers, dryers etc during the middle of the day.
Orientation has quite a large effect on production. North is optimal and each movement away form north will mean less production.
The angle of your roof doesn’t massively effect your system’s production. To get the best production, your roof should be pitched at the same degrees as the latitude of your location. For example, Brisbane’s coordinates are as follows – Latitude 27°25’S – Longitude 153° 9′ E
This means that the best roof pitch is 27 degrees which is about what most roofs are.
If your pitch is different to this, don’t worry, for every 5 degrees difference from this, you lose 1% production. So if the panels were laid flat, you’d only lose about 5% production.
This figure can be verified by using tools such as PVsyst