Estimate solar system size, panel count, annual energy production, roof area and market-based installation cost from monthly electricity use.
How the solar sizing works
The calculator starts with monthly electricity use and your desired solar coverage, then applies peak sun hours and a system-loss factor to estimate DC array size and panel count.
Before you buy equipment
This is a planning estimate. Shading, roof orientation and tilt, module temperature, inverter design, local weather, roof loading and electrical requirements can change the final system design.
Frequently asked questions
What are peak sun hours?
Peak sun hours express daily solar energy as equivalent hours at full reference irradiance; they are not simply daylight hours.
Is the panel count a final design?
No. It is a planning estimate that should be validated against shading, orientation, roof conditions, equipment choices and local electrical requirements.