Solar Panel Sizes & Roof Space Guide for Indian Homes
What Is the Size of a Solar Panel?
Most modern residential solar panels installed in India are approximately 1.7 to 2.3 metres long and 1.0 to 1.3 metres wide, depending on the manufacturer, technology, and wattage rating.
Typical residential solar panel specifications:
| Dimension | Range |
|---|---|
| Length | 1.7 m – 2.3 m |
| Width | 1.0 m – 1.3 m |
| Area | ~20–30 sq ft per panel |
| Power Output | 450W – 600W+ |
Higher wattage panels are physically slightly larger but generate more electricity per panel — meaning fewer panels needed for the same system size.
How Many Panels Do You Need?
The number of panels required depends on system size and the wattage of each panel. The table below uses modern 500W panels as a reference.
| System Size | Approx. Panels | Roof Area Required |
|---|---|---|
| 1 kW | 2 panels | ~100 sq ft |
| 2 kW | 4 panels | ~200 sq ft |
| 3 kW | 6 panels | ~300 sq ft |
| 5 kW | 10 panels | ~500 sq ft |
| 8 kW | 16 panels | ~800 sq ft |
| 10 kW | 20 panels | ~1,000 sq ft |
Panel counts are illustrative examples based on modern high-efficiency residential solar panels. Actual counts vary with panel wattage.
To find the right system size for your electricity bill, use our solar system sizing guide.
Roof Space by Home Type
Small home (1–2 kW) 100–200 sq ft of shadow-free roof space. Suitable for basic appliances, fans, lights, and a small refrigerator. Typical for 1–2 bedroom flats.
Medium home (3–5 kW) 300–500 sq ft of usable roof. The most common range for Indian households running air conditioners, refrigerators, washing machines, and lighting. Eligible for PM Surya Ghar subsidy up to 3 kW at the highest subsidy rate.
Large home (8–10 kW) 800–1,000 sq ft of available roof. Suitable for larger families with multiple AC units and heavy electricity use above ₹5,000/month.
Factors That Affect Roof Space Requirements
Beyond the basic calculation, several factors influence how much usable roof you actually have:
- Panel wattage — Higher wattage panels (550W–600W) need marginally more space but reduce total panel count
- Roof shape and orientation — South-facing pitches are ideal; L-shaped or fragmented roofs have less contiguous usable space
- Shading — Trees, water tanks, staircase enclosures, and neighbouring buildings can reduce usable area significantly
- Walkway and maintenance clearances — Installers typically leave 1–2 ft clearance around the panel array
- Tilt and mounting structure — Panels on a flat RCC roof need tilt frames, which add spacing between rows to avoid self-shading
Getting an Accurate Estimate
A site inspection by a qualified solar installer is the most reliable way to assess your actual roof capacity. They will measure shadow-free area, evaluate structural load, and recommend the optimal layout.
Use our AI solar calculator to get an initial estimate based on your electricity bill — then compare quotes from verified installers.