BorisG Posted September 25 Report Share Posted September 25 Hi PVSol Team, I'm having troubles understanding the Yield reduction due to shading. I've read that it's the percentage difference between shaded and unshaded simulations. When export control is activated the reduction is lower (for identical systems). Where does the difference come from/how exactly is it calculated when export control is turned on? I would have guessed the shading losses to increase with export control because the clipping is usually during the midday when shading is low, so we remove production with "low shading". I think the presentation of the data in this way may be misleading. Attached are two screenshots for the identical system with only export control (0%) activated. Thanks in advance! Boris Quote Link to comment Share on other sites More sharing options...
developer_mh Posted September 26 Report Share Posted September 26 (edited) Hi Boris, the 'Yield reduction due to shading' is calculated as the ratio of the PV Generator Energy (AC) minus the Clipping at the Feed-in Point without shadows and the same number with shadows. So, as example you have the following (the numbers are from one of our example projects). System 1, without feed-in clipping/export control: without shadows: PV Generator Energy (AC) =145,377 kWh Feed-in Clipping = 0 kWh with shadows: PV Generator Energy (AC) =132,972 kWh Feed-in Clipping = 0 kWh Yield reduction =1 - (132,972 - 0) / (145,377 - 0) = 8.6 % System 2, with feed-in clipping/export control: without shadows: PV Generator Energy (AC) =145,377 kWh Feed-in Clipping = 59470 kWh with shadows: PV Generator Energy (AC) =132,972 kWh Feed-in Clipping = 52,822 kWh Yield reduction =1 - (132,972 - 52,822) / (145,377 - 59470) = 6.8 % Hope that helps, kind regards, Martin Edited September 26 by developer_mh Added the note that the numbers come from one of our example projects Quote Link to comment Share on other sites More sharing options...
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