How to Check if Your Roof is Suitable for Solar Panels

Before you sign a single document or pay any installer, you need to know whether your roof can actually support a solar installation that performs well for 25 years.

1. Roof Orientation and Tilt

In India, south-facing roofs receive the most sunlight throughout the year. East and west-facing roofs work too, but expect 10-15% lower generation. North-facing roofs are generally unsuitable.

The ideal tilt angle equals your latitude. For most of peninsular India, that is between 10-15 degrees. For northern India, 25-30 degrees works best.

2. Shadow Analysis

This is the most commonly skipped step. Your installer should perform a shadow analysis at different times of day and across seasons. Trees, neighbouring buildings, water tanks, and parapets all cast shadows that reduce output significantly.

Even 10% shading on a single panel can reduce the entire string’s output by 30-50% depending on the inverter type.

3. Structural Assessment

Solar panels add approximately 15-20 kg per square meter of load to your roof. Most RCC roofs handle this easily. However, older buildings, tin roofs, or roofs with existing structural concerns need an engineer’s evaluation.

4. Available Area

A typical 1 kW solar system needs approximately 60-80 square feet of shadow-free roof area. For a 5 kW residential system, you need at least 300-400 square feet of usable space.

Need an Expert Assessment?

A professional feasibility assessment covers all of these factors and more. Book a site visit with HimRenew for Rs. 5,000 and get a written report with clear recommendations.