Solar Generation Performance Estimates

We use the government approved Standard Assessment Procedure (SAP) 2012 Edition to accurately forecast the expected performance of the installation and the financial returns. A full copy of this can be obtained from the British Research Establishment website at :

We match these calculations to the annual power usage profile of the business to work out the power that will be used on site and the excess power likely to be exported back to the grid.

The panels degrade slowly with time and we allow for the 0.87% decrease in output annually.

We also make an allowance for electricity price inflation to calculate savings using current inflation predictions.