Looking to switch to solar energy and save on your electricity bills? Our free Rooftop Solar Calculator helps homeowners and businesses in India quickly estimate the right solar system size, installation cost, and potential savings based on your electricity usage.

Whether you provide your monthly electricity bill or units consumed, this solar calculator gives you clear and accurate results. It factors in the average sunlight hours in your region, typical solar panel performance, and helps you plan a cost-effective solar power solution.

Solar energy not only reduces your dependence on grid electricity but also lowers your monthly expenses and contributes to a cleaner environment. Use our tool now to get personalized solar insights — no signup required!

“This tool is designed to help you understand how much solar energy your roof can generate and how much you can save over time“

What Is a Rooftop Solar Calculator?

A rooftop solar calculator is an online tool that estimates how much solar power you can generate from a solar panel system installed on your roof. It considers your electricity consumption, location, roof conditions, and available sunlight to calculate:

• Required solar system size (in kW)
• Estimated installation cost
• Approximate monthly and yearly savings

This helps you budget and plan for solar installation with confidence.

How Our Solar Calculator Works

Our calculator uses:

1. Your Electricity Usage – either monthly bill amount or units consumed.
2. Average Sunlight in your region – peak sun hours make a big difference.
3. Solar Efficiency – typical output from solar panels per kW.
4. Cost Assumptions – current installation cost trends in India.

Based on these inputs, it estimates a realistic system size (kW) and potential savings.

Why Use a Rooftop Solar Calculator?

• Save Time: No manual calculations needed.
• Accurate Estimates: Uses real data and sunlight averages.
• Budget Planning: Helps estimate finances before installation.
• Compare Options: Try different bill values and scenarios.
• Government Schemes: Helps understand benefit from subsidies.

Who Should Use This Tool?

This solar calculator is ideal for:

• Homeowners considering solar panels
• Businesses planning rooftop solar installation
• Solar installers and consultants looking for quick estimates
• Anyone wanting to reduce electricity costs

Solar System Size Explained (kW)

The solar system size you need depends on:

• Your electricity consumption (units per month)
• Sunlight hours in your area
• Roof size and direction

For example:

• 1 kW solar can generate approx. 3–5 units per day (varies by region)

Understanding this helps you choose between:

• 1 kW, 3 kW, 5 kW, or larger systems

Average Sunlight Hours by Region in India

Sunlight affects output significantly. Typical averages:

• North India: ~5–5.6 hrs/day
• South India: ~5–5.5 hrs/day
• West India: ~6–7 hrs/day
  (These are approximate and vary by season)

Estimated Solar System Cost in India

Solar installation costs depend on:

• Panel type (mono/ polycrystalline)
• Inverter quality
• Mounting and wiring
• Subsidy applied or not

Approx cost ranges (subject to change):

• ₹40,000 – ₹70,000 per kW (before subsidy)

How You Save on Electricity Bills

With solar:

• Your grid dependency reduces
• You generate your own power
• Surplus can be sent to grid (net-metering)
• You reduce monthly expenses

Example:
If you install a 5 kW system and generate ~600–700 units/month, your bill can drop significantly depending on your usage.

Government Solar Subsidies & Incentives

Various Indian states and Central govt. schemes offer subsidies which can lower system cost:

• Residential rooftop solar subsidy (varies by tariff category)
• Net metering benefits
• Faster payback period

Check with your local DISCOM for details.

Frequently Asked Questions (FAQ)