Solar system installation

A method of installing a photovoltaic (PV) system, comprising:

• receiving a permit based on a determined maximum number of photovoltaic (PV) modules to be positioned on a roof of a structure and one or more regions on the roof for positioning at least the maximum number of PV modules;
• evaluating the suitability of various locations for PV modules within the regions;
• determining a number of PV modules to be installed on the roof, the number of PV modules less than or equal to the maximum number of PV modules;
• and
• installing the number of PV modules within at least one of the one or more regions.

A method, comprising:

• determining a minimum number of photovoltaic (PV) modules for the PV system;
• determining a maximum number of PV modules of a PV system to be positioned on a roof of a structure;
• determining one or more regions on the roof for positioning at least the maximum number of PV modules;
• submitting a permitting package including the maximum number of PV modules and the one or more regions;
• installing the PV system including a number of PV modules less than or equal to the maximum number of PV modules and greater than or equal to the minimum number of PV modules and within at least one of the one or more regions;
• and
• establishing an accurate energy forecast of the PV system after installing the PV system.