Find out exactly how many solar panels you need for your home or business. Choose your panel wattage, enter your monthly consumption, and get an instant count with roof area and cost estimates.
| Panel Type | Wattage | Dimensions (approx) | Area/Panel | Best For |
|---|---|---|---|---|
| Mono PERC Popular | 400W | 1755 × 1038 mm | ~20 sq ft | Homes, SME |
| Mono PERC | 440W | 1903 × 1040 mm | ~22 sq ft | Homes, SME |
| TOPCon Premium | 480W | 2094 × 1038 mm | ~24 sq ft | Homes, Commercial |
| TOPCon / HJT | 540W | 2256 × 1133 mm | ~28 sq ft | Commercial rooftop |
| Bifacial TOPCon | 600W | 2384 × 1134 mm | ~30 sq ft | Large commercial |
The number of panels depends on three things: how much electricity you use, how much your city's sun can generate per panel, and how much of your bill you want to offset.
Example: 400W panels in Delhi (5 peak sun hours/day):
Daily gen = 0.4 kW × 5 hrs = 2 units/day → 60 units/month per panel.
For 300 units/month: 300 ÷ 60 = 5 panels needed.
Mono PERC (400–440W): Most widely installed in India. Cost-effective, reliable, backed by many local manufacturers (Waaree, Vikram, Adani Solar, Tata Power Solar). Ideal for most homes and small businesses.
TOPCon (450–550W): 2–3% higher efficiency than Mono PERC. Better performance in low light and high temperatures — important in Indian summers where panel temps can hit 60–70°C. Premium price but delivers more units/sq ft of roof.
HJT (Heterojunction): Best in class for efficiency and temperature coefficient. Significantly more expensive. Suited for premium installations with space constraints.
☀️ Pro tip: If your roof space is tight (under 200 sq ft for a 3 kW system), choose higher-wattage TOPCon panels to fit more power in less area. If space is not a constraint, standard 400W Mono PERC panels give the best value for money.
Each panel needs its physical area plus spacing for mounting rails and walkway access. A practical rule of thumb is 22–25 sq ft per panel (including gaps) for a standard ground-mounted or rooftop installation.
Avoid areas with shade from water tanks, chimneys, AC units, or adjacent buildings. Even 10% shading on a panel can reduce system output by 20–30% if you don't have micro-inverters or power optimisers.
Waaree Energies — India's largest panel manufacturer. Wide range, good warranty support.
Vikram Solar — Premium brand, strong export market. Good efficiency ratings.
Adani Solar — Vertically integrated, competitive pricing for large volumes.
Tata Power Solar — Trusted brand, strong service network across India.
Saatvik Solar — Growing manufacturer, good value for residential.