The maximum payback period defaults to 50 years. Green Building Studio will calculate the performance of PV panels on all surfaces, but will only consider panels for the Installed Summary that will pay for themselves within the Maximum Payback Period. Increasing this value will likely result in more surfaces being included in the calculations, and decreasing this value will likely results in fewer surfaces being included.
The data in the Installed Panel Cost and the Applied Electric Cost fields are used, in conjunction with the weather files, to determine which surfaces will pay for themselves through net metering within the Maximum Payback Period. Review the information above for both the Installed Panel Cost and the Applied Electric Cost fields to determine if it is reasonable for you to make adjustments to those default assumptions. Reducing the Installed Panel Cost and/or increasing the Applied Electric Costs fields will result in more surfaces being included in the calculation and will also reduce the Payback Period shown in the Summary section.