One of the most common questions homeowners ask before going solar is: How many panels do I need? The answer depends on several factors specific to your home and energy usage.
Start With Your Electricity Bill
Look at your monthly electricity consumption in kilowatt-hours (kWh). In India, the average household consumes between 150-400 kWh per month. Your electricity bill will show your monthly or bi-monthly consumption figures.
Calculate Your Required System Size
A general guideline is that 1 kW of solar capacity generates approximately 4-5 units (kWh) of electricity per day in most parts of India, depending on location and weather. So if you consume 300 kWh per month (about 10 kWh per day), you would need approximately a 2-2.5 kW system.
Panel Count Depends on Panel Wattage
Modern solar panels are available in various wattages, typically ranging from 330W to 550W for residential use. For a 3 kW system using 540W panels, you would need approximately 6 panels. Using 330W panels, you would need about 9 panels.
Roof Space Requirements
Each solar panel requires approximately 18-22 square feet of shadow-free roof area. For a 3 kW system with 6 panels, you would need roughly 120-130 square feet of usable roof space.
Get a Professional Assessment
While these guidelines help you estimate, a professional site survey is the most accurate way to determine the right system size for your home. An engineer will assess your roof, shading conditions, electrical setup, and consumption pattern to recommend the optimal solution.