The Solar PV design area will allow you to carry out performance estimations of all sizes under the standard method stated in the PV Guide.
For systems under 30kW, PV systems are deemed as 50% of energy will be exported back to the grid and 50% will be deemed to be used on site. This is why the software will automatically default to 50% exported back to the grid. However, you may alter the export percentage for larger systems that may export smaller or larger of amounts of electric back to the grid for a more accurate estimate.
For any further questions please speak to your Mentor on Freephone 01244 784 260 or email [email protected]