Roof area, annual load and local solar resource set the first range.

Inputs used in the solar screen

The calculation combines annual Natural Resources Canada reference yield with user-entered usable area and annual electricity use.

• Annual NRCan reference yield
• Usable-area capacity
• Load-matched capacity
• Annual generation range
• Annual net-energy value

What a site study must add

A pre-feasibility range cannot replace physical, electrical, utility, and operating evidence.

• Structural capacity
• Shade
• Setbacks and fire access
• Equipment layout
• Service and interconnection
• Interval load
• Export rules

Orientation

The preliminary screen uses south-facing latitude tilt and does not imply the roof has that geometry.

Check the calculation

Run the calculation, then check its formulas, source dates and exclusions against the proposed site.

• Run the model
• Read the methodology