Free Rooftop Solar ROI Estimator

Solar Rooftop Calculator: Find Out How Much You Can Save with Solar

Wondering whether rooftop solar is really worth it for your home or business? Our solar rooftop calculator gives you a clear answer in a few seconds. Enter your average monthly electricity bill, choose a plant capacity, and see your estimated yearly savings, payback period, 25-year earnings and the carbon you'll keep out of the air. No sign-up needed, no calls, just numbers you can use.

Step 1 & 2

Your Consumption & Size

₹
Solar Plant Capacity:3.0 kW
1 kW50 kW

*1 kW produces ~120 units/month. Divide monthly units by 120 for a baseline capacity.

Step 3

Estimated Financial & Green Impact

Live Projection
Annual Savings₹21,600Yearly bill reduction
Payback Period7.6 YearsBreak-even timeline
25-Year Earnings₹5,40,000Estimated cumulative gain
CO₂ Saved Per Year3.54 Tons/yrAvoided carbon emissions

Assumptions: 120 units/kW/month, ₹5/unit grid tariff, ₹55,000/kW initial cost, and 0.82 kg CO₂/unit factor. Costs shown are before applicable central subsidies.

Understanding The Model

What Is a Solar Rooftop Calculator?

A solar rooftop calculator is a simple tool that estimates what a solar power system will cost you and what it will give back. Instead of guessing, you can compare your current electricity bill with the savings a rooftop plant could deliver year after year. It helps you decide the right system size and understand how long it will take for the system to pay for itself.

Our calculator is built for Indian households, shops, offices and small industries, so the numbers use rupees, units and tariffs you already recognise from your own bill.

How to Use the Solin Green Solar Calculator

1

Step 1: Enter your average monthly electricity bill

Average your winter and summer bills to get a balanced picture.

2

Step 2: Choose your solar plant capacity

Slide anywhere from 1 kW to 50 kW. Divide monthly units by 120 as a starting point.

3

Step 3: Read your results

Review annual savings, payback period, 25-year earnings, and CO₂ saved.

How We Calculate Your Solar Savings

We keep the maths simple and transparent so you can check it yourself. The calculator uses these assumptions:

Production: 120 units/kW/month
Grid tariff: ~₹5 per unit
System cost: ~₹55,000 per kW
Carbon factor: 0.82 kg CO₂/unit

A quick example:A 3 kW system produces about 360 units a month, or roughly 4,320 units a year. At ₹5 a unit, that's around ₹21,600 saved every year. With an estimated cost of ₹1,65,000, the system pays itself back in a little under 8 years, and then keeps saving for many years after. It also avoids about 3.5 tons of CO₂ annually.

Why Go Solar? Benefits of a Rooftop Solar System

Lower electricity bills for decades

Once installed, your panels generate power at almost no running cost, protecting you from tariff hikes.

Works for homes, shops and industry

Small homes can start with 2 to 5 kW, while institutions and factories scale up to 50 kW and above.

Low maintenance

No moving parts. Occasional washing and inspection are usually enough for optimal output.

Got Questions?

Frequently Asked Questions

How accurate is this solar calculator?
It gives a reliable estimate based on standard production, tariff and cost values. Your real savings can differ depending on sunlight at your location, roof direction, shading, and your electricity tariff. For an exact quote, request a site visit.
How many units does a 1 kW solar system produce?
On average, about 120 units per month, or roughly 4 units a day. This can be a bit higher in sunny months and lower during monsoon or heavy winter cloud.
How much does a solar system cost per kW in India?
Our calculator assumes about ₹55,000 per kW. The final price depends on the panel brand, inverter type, mounting structure, and installation needs. Larger systems often cost less per kW.
What is the payback period for rooftop solar?
For most homes and businesses, payback usually falls somewhere between 4 and 8 years, depending on system cost, your tariff and any subsidy. After that, your electricity from solar is practically free.
How many kW solar do I need for my home?
A typical 2 to 3 bedroom home using 250 to 400 units a month is often well served by a 2 to 3 kW system. Use the calculator or contact us for personalised advice.
Can solar work in Jammu & Kashmir, where winters are cold?
Yes. Solar panels work on sunlight, not heat, and they can actually perform efficiently in cool, clear conditions. Snow and shading need to be planned for during installation.
How long do solar panels last?
Quality panels are built to last 25 years or more, with a slow, gradual drop in output over time.
Is there any charge for using the calculator?
No. The calculator is completely free to use, as many times as you like.

Solar Services by Solin Green

Solin Green is a solar energy company based in Jammu & Kashmir, helping homes and businesses across India switch to clean power. Besides rooftop systems, we offer:

Residential Solar Industrial Solar Solutions Commercial Solar

Ready to Go Solar? Talk to Solin Green

Fill in our enquiry form or call us directly at +91 9149765727.

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