How much roof area do I need?

Typically, 1kW solar requires around 100 sq.ft roof area. Example: 5kW needs ~500 sq.ft.

Solar Rooftop Calculator | MB Electrical (2025)

Use our free Solar Rooftop Calculator to estimate cost, subsidy, ROI, savings, required panels and roof size.

Solar Rooftop Calculator

Enter your monthly bill or units to estimate cost, subsidy, savings & ROI

Why Use MB Electrical Solar Calculator?

The MB Electrical Solar Panel Cost Calculator is a free online tool to estimate solar rooftop system cost, government subsidy, savings on electricity bills, and ROI. It simplifies decision making for homeowners and businesses in India.

Our Solar Calculator India 2025 considers subsidy rates (20–40% for residential users under MNRE scheme), cost per kW (~₹55,000–₹65,000), and average solar output. This helps you know the required system size (kW), roof area, number of panels, final cost after subsidy, and your payback period.

You can also explore our Inverter Installation Guide and Electrical Wiring Safety Tips to make your solar installation safer and more efficient. For subsidy eligibility, visit the official National Rooftop Solar Portal.

How to Use MB Electrical Solar Calculator?

Using the MB Electrical Solar Rooftop Calculator is very simple. It is designed for homeowners, shop owners, and businesses in India who want to estimate their solar panel cost, subsidy, roof area, and payback period. Just follow these easy steps:

Select Category: Choose Residential if you are calculating for your home, or Commercial if it is for shop/office.
Choose Calculation Type: You can enter your Electricity Bill (₹) or your Monthly Units (kWh).
Enter Value: If you selected Bill, type your average electricity bill (e.g., ₹3000). If Units, enter your usage (e.g., 250 units/month).
Click Calculate: The solar calculator will instantly show you:
- System Size (in kW)
- Number of Solar Panels
- Required Roof Area
- Total Cost & Subsidy
- Final Cost after subsidy
- Annual Savings & CO₂ Saved
- Payback Period (ROI) in years

This makes it easier for you to know whether solar rooftop installation is the right choice for your home or business. You can also check our Best Wire for House Wiring in India guide to ensure you are using safe ISI-marked cables. For government policy details, visit MNRE – Ministry of New & Renewable Energy.

Frequently Asked Questions

ROI (Return on Investment) shows how many years it will take to recover your solar system cost from electricity bill savings.

Typically, 1kW solar requires ~100 sq.ft roof area. Example: 5kW needs ~500 sq.ft.

Residential users get 20–40% subsidy under MNRE scheme. Commercial installations usually don’t get subsidy.

Solar Panel Cost Calculator in India (2025) – MB Electrical