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Solar performance and roof pitch

While the optimum angle for fixed frame panels in Hobart is 36°, there is minimal loss in power for even a 10° variation on either side. Based on models and research published by the Australian Cooperative Research Centre at the ANU, here are some charts on the efficiency of solar power panels mounted at different angles in Hobart. 

The following table shows % reduction in performance at different angles.

 Roof pitch (degrees) Reduction in performance %
 15.0° 4.0%
 22.5° 1.5%
 30.0° 0.3%
 36.0° Optimal
 45.0°   0.8%

This is based on the following charts of predicted monthly solar power generation at different module angles (roof pitch). These are based on 1 kW PV array facing due north in Hobart and the data is derived from the interactive tool at: