Broadly, if you use 330 watts solar panels to get a 6.6 kW solar system you might need around 20 panels i.e., 20x330 watts. However, it depends upon various other factors. For example, a commercial solar installation Perth will differ from Brisbane because of the difference in the sunshine.
How to determine the number of solar panels for a 6.6kW solar system?
Solar panel output
The output of a solar panel depends upon the availability of sunshine which varies by season. For example, a 6.6kw solar system Perth will differ from Sydney because the 6.6kW system generates 29.0kWh in Perth whereas it generates 25.7kWh in Sydney.
The variation of output happens due to the difference in sunshine in different cities. Sydney gets a higher amount of sunshine than Perth, especially in winter. If you take another example, a 6.6kw solar Adelaide or Brisbane generates higher i.e., 27.7kWh than Melbourne which is 23.8kWh.
Efficiency of panels
Besides the factor of solar panel output while determining the number of solar panels to generate 6.6kW, the efficiency of panels matters. For instance, 330W panels are better in efficiency and you may need around 20 panels. But if you choose 275W panels you may need 4 more i.e 24. However, you should consult Solar installers Perth to know the exact requirement of panels.
Roof space
Another important factor to determine the number of solar panels is the roof size. You may need a roof space of 34m2 to install a 20-panel 6.6kW solar system whereas 40.8mm2 roof space for 24 panels.
Determining the exact number of panels for a 6.6kW system is a technical matter and a bit tricky. You may have to take professional assistance from solar panel installation Darwin to do the job perfectly.
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