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Utility & Plumbing
Solar Panel Area Calculator (2026) – Rooftop Space Planner
Expert Guide
Calculate total roof area required for solar panels including shadow-free maintenance buffers.
⚡ Quick Answer
A 3kWp solar system requires ~130–150 sq.ft of shadow-free rooftop space using 550W panels. For roof-mounting structural engineering, visit pro.nirmansutra.com.
🛠️ How It Works
- •Enter the total solar capacity you wish to install.
- •The tool calculates the physical footprint including a safety margin for technician access and maintenance.
📐 Calculation Formula
Num Panels = System kWp / Panel Watts
Total Area = (Num Panels × Area) + 15% walkway
⚠️ Common Mistakes to Avoid
- ✕Ignoring chimney/tank shadows — even a small shadow can drop array output by 30%.
- ✕Forgetting structural weight — ensure your slab can handle the point-load of solar mounting brackets.
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❓ Frequently Asked Questions
A 5kW system using high-efficiency 550W panels requires approximately 300–350 sq.ft of shadow-free rooftop space, including maintenance walkways.
Walkways are essential for regular cleaning and maintenance access. Dust can reduce panel efficiency by 20%, so easy access for cleaning is vital for ROI.
For most parts of Nepal, a tilt angle of 20 to 30 degrees facing South is optimal for maximum year-round energy yield.
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Worth NRs. 5,000
NRs. 999 🎯
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