Accuracy of predicted solar PV generation set to increase
Posted by Cathy Debenham on 2 April 2012 at 9:09 am
The amount of sunshine in Sheffield is currently used as the basis for all predictions of solar generation, where ever you live. This means that people in the south are likely to be delighted when their new system produces more electricity than promised. The outcome isn't so good for people in northern Scotland, who may find their actual output is lower than promised.
The good news is that new standards are due to be introduced with the publication of the third edition of the PV installation guide by the DTI. It is expected to be available from the end of April.
The new system, which will be aligned with SAP 2012, will use the Met Office's solar radiation data. This means that installers will be able to do a postcode search and make much more accurate predictions of how much electricity a system will generate. There will also be improved allowance for the pitch and orientation of the panels.
The new guide will also introduce a more rigorous system for estimating the impact of shade on a PV array. Installers will have to draw a horizon line and map the impact of any shaded areas.
The result: people investing in solar PV will be able to calculate the costs and returns of their investment more accurately, wherever they live.
Click on the picture to enlarge it.
Contains public sector information licensed under the Open Government Licence v1.0
By Cathy Debenham
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