Solar Roof Capacity Calculator
Estimate the whole-panel count and DC capacity from usable area, utilisation, panel dimensions, and panel wattage.
Panel count uses exact decimal floor of area × utilisation ÷ (length × width). Capacity = count × W ÷ 1,000 kWp. Area arithmetic does not guarantee rectangular layout, structural capacity, or installation suitability. A ≥ 0; 0 ≤ u ≤ 100%; l > 0; w > 0; W > 0; n ≤ 9,007,199,254,740,991 This area model does not calculate energy generation, shading, roof layout or grid connection.
A QUICK WALKTHROUGH
How to use this tool
- Estimate the whole-panel count and DC capacity from usable area, utilisation, panel dimensions, and panel wattage.
- Panel count uses exact decimal floor of area × utilisation ÷ (length × width). Capacity = count × W ÷ 1,000 kWp. Area arithmetic does not guarantee rectangular layout, structural capacity, or installation suitability.
Formula and scope
Panel count uses exact decimal floor of area × utilisation ÷ (length × width). Capacity = count × W ÷ 1,000 kWp. Area arithmetic does not guarantee rectangular layout, structural capacity, or installation suitability. A ≥ 0; 0 ≤ u ≤ 100%; l > 0; w > 0; W > 0; n ≤ 9,007,199,254,740,991 This area model does not calculate energy generation, shading, roof layout or grid connection.
Assumptions
All numerical inputs are user supplied; no numerical recommendations are prefilled.
Local processing
Values stay in your browser.
GOOD TO KNOW
Common questions
What does this estimate?
It calculates only from your inputs; it is not equipment or safety advice.
Are inputs uploaded?
No. All calculations run locally in your browser.