The Simplest Way to Size Your Solar System
The most common question we get from Lucknow homeowners isn't "how much does solar cost" — it's "how many panels do I actually need?" Here's the quick answer, based on your monthly electricity bill.
Match Your Bill to a System Size
| Monthly Electricity Bill | Recommended System Size | Approx. No. of Panels (540W each) |
|---|---|---|
| Below ₹1,500 | 1 kW | 2 panels |
| ₹1,500 – ₹2,500 | 2 kW | 4 panels |
| ₹2,500 – ₹4,000 | 3 kW | 6 panels |
| ₹4,000 – ₹8,000 | 5 kW | 10 panels |
| Above ₹8,000 | 10 kW | 18–20 panels |
A standard modern monocrystalline panel is 535–545W. Older or budget panels (330–400W) will need more panels for the same kW capacity.
Why Bill Amount Is the Best Starting Point
Your electricity bill directly reflects your household's average unit (kWh) consumption, and Lucknow gets consistent sunlight (roughly 4.5–5.5 peak sun hours daily on average across the year), which makes bill-based sizing fairly reliable city-wide — whether you're in Gomti Nagar, Jankipuram, or Alambagh.
Rule of thumb: 1 kW of rooftop solar in Lucknow generates roughly 1,400–1,450 units per year.
How Much Roof Space Do You Actually Need?
- 1 kW — approximately 90–100 sq. ft.
- 3 kW — approximately 270–300 sq. ft.
- 5 kW — approximately 450–500 sq. ft.
- 10 kW — approximately 900–1,000 sq. ft.
Most independent houses in Lucknow's residential colonies (Gomti Nagar, Aliganj, Indira Nagar, Rajajipuram) comfortably fit a 3–5 kW system on the terrace alone.
What Can a 3 kW System Actually Run?
A 3 kW system — the most commonly installed size in Lucknow — can typically power:
- 1 air conditioner (1.5 ton)
- Refrigerator
- Washing machine
- 4–5 fans
- Lights and TV throughout the home
- Basic kitchen appliances
What About a 5 kW System?
A 5 kW system, generating around 7,000–7,250 units/year, can comfortably run:
- 2 air conditioners (1.5 ton each)
- Refrigerator, washing machine, water pump
- 6–8 fans and full home lighting
- Kitchen appliances and entertainment systems
Don't Just Guess — Get a Free Site Survey
While this guide gives you a solid starting estimate, the exact number of panels depends on your roof's shadow-free area, orientation, and your actual 12-month average consumption. Eastern Solar Light offers a free home visit and 3D rooftop design for anyone in Lucknow — from Jankipuram to Chinhat — so you get an exact recommendation, not a guess.
Call +91 97930 03809 to book your free survey today.