Solar Calculator: Estimate Your Solar System Size, Cost, Subsidy & Savings
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Not sure which solar system is right for your home? Get a personalised estimate in under a minute based on your monthly electricity bill and see how much you could save with rooftop solar.
Freyr Energy Solar Calculator
Calculate Your Savings
Explore the potential of solar energy and start saving from Day One!
Your Ideal System Size
3 kW
Annual Savings
₹ 30,000
Annually Generated Energy
4,286 Units
Roof Space Required
238 Sqft
Price (Excluding Subsidy & GST) ₹ 1,99,138
Subsidy + Freyr Energy Discount
Effective Cost ₹ 99,138 Down payment
₹ 21,138Loan Amount
₹ 78,000Installing rooftop solar is a long-term investment, and choosing the right system size is one of the most important decisions you’ll make. A system that’s too small won’t deliver the savings you expect; an oversized one increases your upfront investment without a proportional payoff.
If your monthly electricity bill is around ₹3,000, a 3 kW rooftop solar system could reduce it to just ₹200–₹300, helping you save up to 90% on your electricity bills. Eligible homeowners can receive up to ₹78,000 in government subsidy under the PM Surya Ghar Muft Bijli Yojana, reducing the overall cost of installing rooftop solar. Freyr Energy’s Solar Calculator gives you a personalized estimate in under a minute based on your monthly electricity bill and property type.
Calculate your solar requirement now and understand your investment before scheduling a professional site survey.
What is a Solar Calculator?
A Solar Calculator is an online tool that estimates the ideal solar system size, installation cost, government subsidy, expected electricity generation, roof space requirement, and potential electricity bill savings based on your monthly electricity bill and property type.
Quick Takeaways
Estimate the solar system size required based on your electricity bill
Calculate approximate installation cost, subsidy, and effective investment
Understand expected annual electricity generation and savings
See your estimated payback period and long-term return on investment
Check approximate rooftop space required before installation
Get a realistic starting estimate before connecting with solar experts
How Does a Solar Calculator Work?
A solar calculator uses your electricity consumption details to estimate the solar capacity required to meet your energy needs, following this process:
Freyr Energy’s Solar Calculator uses your monthly electricity bill, current installation pricing, and the latest PM Surya Ghar subsidy guidelines to generate this estimate.
How We Calculate Your Results
| Result | Based On |
| Solar System Size | Monthly electricity consumption |
| Installation Cost | Current Freyr pricing |
| Subsidy | PM Surya Ghar slab |
| Savings | Estimated annual generation × electricity tariff |
| Roof Space | System size × panel efficiency |
| Annual Generation | System size × average sunlight |
How to Use Freyr Energy's Solar Panel Calculator
Getting your solar estimate takes less than a minute.
Results are indicative estimates. Final system design and pricing are confirmed after a free professional site survey.
Enter Your Monthly Electricity Bill
This helps determine your approximate energy usage, recommended solar capacity, and expected electricity generation.
01
Select Your Property Type
Choose Residential or Commercial - subsidy eligibility and typical sizing differ between the two (see the subsidy section below).
02
Get Your Solar Estimate
Based on your inputs, you’ll instantly see your recommended system size, estimated installation cost, applicable government subsidy, Freyr Energy discount (where applicable), effective investment, expected annual savings, estimated yearly generation, and approximate roof space required.
03
How to Use Freyr Energy's Solar Panel Calculator
How Much Solar Do You Need?
Your exact requirement depends on consumption, location, roof conditions, and usage pattern – but here’s a typical range:
Worked example — a ₹3,000/month bill (≈300 units):
Note: These are approximate values. Your solar power calculator result will reflect your actual bill and site conditions.
Government Subsidy Guidelines (PM Surya Ghar Muft Bijli Yojana)
Residential rooftop solar installations are eligible for a central subsidy under the PM Surya Ghar Muft Bijli Yojana, credited via Direct Benefit Transfer to your bank account 30–45 days after your DISCOM commissions the installation:
A few important details
- This subsidy applies to residential properties only. Commercial solar installations are not covered under PM Surya Ghar — commercial customers can still use this calculator to estimate system size, cost, and generation, but the "Government Subsidy" figure will not apply to them.
- The subsidy covers panels and inverters only, not battery storage.
- Some states offer additional top-ups on top of the central subsidy (special category/hill states qualify for higher caps; a few states add their own top-up schemes).
- Equipment must be on the MNRE's ALMM-approved list for the subsidy claim to clear.
- The solar calculator applies the correct slab automatically based on your recommended system size and property type.
Source: Ministry of New and Renewable Energy, PM Surya Ghar portal
Why Use Freyr Energy's Solar Calculator?
Choosing solar involves solar system size, cost, subsidy, savings, and roof requirements all at once. This calculator simplifies that decision — and unlike generic solar online calculators, it’s built on real installation data, not national averages.
Get a realistic estimate Based on your actual electricity bill and property type – not generic assumptions – showing how much capacity you need, your approximate investment, and expected savings over time.
Uses Freyr Energy’s current pricing Costs shift with system size, equipment selection, installation requirements, and location – the calculator reflects our latest pricing, not stale market averages.
Automatically applies government subsidy Eligible PM Surya Ghar subsidy is factored in automatically, so you see your realistic effective investment, not just gross cost.
Suitable for homes and businesses Whether it’s an individual home, apartment, office, shop, or commercial building, the calculator provides an initial estimate tailored to your property type.
Why Trust Freyr Energy's Solar Calculator?
This calculator is built on real rooftop solar installation experience, not theoretical assumptions:
Experience across multiple Indian states, with local knowledge of state-specific subsidy top-ups and regulations
Every calculator result is validated through a free professional site survey before final system design and installation begin.
Factors That Affect Your Final Solar Requirement
A solar calculator provides a reliable starting estimate, but your final solar system recommendation is confirmed after a professional site survey. Several factors can influence the final system size, cost, and expected energy generation.
Solar Panel Technology
Different solar panel technologies have varying efficiency levels, which can affect the number of panels required and the rooftop space needed.
Roof Direction and Shading
A rooftop with maximum sunlight exposure and minimal shading generally produces better solar energy generation. Roof orientation and nearby trees or buildings can also impact system performance.
Available Roof Space
The usable rooftop area determines how many solar panels can be installed and whether the recommended system size can be accommodated.
Electricity Consumption Pattern
Homes and businesses with higher daytime electricity usage typically achieve better savings, as more of the solar energy generated is consumed directly rather than exported to the grid.
Location and Weather Conditions
Solar energy generation varies based on your location, sunlight availability, and seasonal weather conditions.
Local Electricity Regulations
Local DISCOM regulations, net metering policies, and approval timelines may influence the installation process and overall project cost.
What Happens After Using the Solar Calculator?
- A solar expert reviews your calculator estimate.
- A free site survey is scheduled at your property.
- Roof conditions and electricity usage are evaluated on-site.
- Final system design and firm pricing are shared with you.
- Installation and regulatory approvals (net metering, DISCOM inspection) are completed.
Freyr Energy supports you through the complete journey, from estimate to commissioned system.
Why Choose Us?
Why Choose Us?
Self-Cleaning Rooftop Solar System
Automated sprinklers keep solar panels clean, maintaining efficiency & boost energy output.
Freyr Energy App
Free quotations, project tracking and payments, to savings via Smart Energy Optimizer's AI powered insights.
24x7 Sales Support
Get expert solar advice and resolutions anytime with our 24×7 support.
EMIs Starting From ₹1,466
Own your solar system with easy EMIs & flexible payment tenures ranging from 6-120 months.
Design / Detailed Project Report
Get a 3D preview & shadow analysis of the solar system customized to your requirement.
Freyr Energy Inverter
The heart of your solar system, designed to generate more electricity, run cooler & deliver reliable performance, with a 10-year warranty.
Insurance coverage up to ₹3 Lakh
Free 1-year insurance coverage upto ₹3L coverage against fire, burglary & natural disasters.
Save ₹1 Lakh on Solar
For 3kW systems and above, save ₹1 Lakh (₹78,000 Govt. Subsidy + ₹22,000 Freyr Energy Discount).
Benefits of Using a Solar Panel Calculator Before Installation
Avoid choosing the wrong system size
balancing investment against expected savings from the start.
Understand your solar investment
knowing approximate cost and subsidy helps you plan your budget realistically.
Estimate long-term savings
see the potential reduction in electricity expenses before committing.
Save time during research
skip manually comparing multiple system sizes and get a fast starting point.
Calculate Your Solar Savings Today
Wondering how much solar you need and how much you could save? Use Freyr Energy’s Solar Calculator above to get your estimated system size, cost, subsidy, and savings in minutes — then book a free site survey to turn your estimate into a firm quote.
Disclaimer
The estimates provided by Freyr Energy’s Solar Calculator are for informational and planning purposes only. Results are calculated based on your electricity bill, available inputs, Freyr Energy’s current installation pricing, and applicable PM Surya Ghar subsidy guidelines. Actual system size, project cost, electricity generation, savings, roof space requirement, and subsidy eligibility may vary depending on roof orientation, shading conditions, structural suitability, electricity consumption patterns, local regulations, and site conditions. Final recommendations and pricing are confirmed after a professional site survey conducted by Freyr Energy’s solar experts.
FAQs
Have any specific questions?
Connect with our solar specialists for personalized guidance.
1 Who Can Use This Solar Calculator?
This calculator is suitable for:
- Homeowners planning rooftop solar
- Commercial buildings and offices
- Small businesses
- Housing societies
- First-time solar buyers
- Customers comparing different solar system sizes
2 Why Does the Calculator Ask for Your Electricity Bill?
Your monthly electricity bill is the easiest way to estimate your average electricity consumption. Based on this, the calculator recommends a solar system that can generate enough electricity to offset your usage, helping estimate installation cost, savings, and applicable subsidy.
3 How accurate is a solar calculator?
A solar calculator provides an estimated solar requirement based on your electricity bill and the information you provide. The final system size and pricing are confirmed after a free professional site survey.
4 Can I calculate solar panel cost online?
Yes. Freyr Energy’s calculator provides an estimated project cost based on your electricity consumption, recommended system size, and applicable PM Surya Ghar subsidy.
5 Does the solar calculator include government subsidy?
Yes, for residential properties. The calculator automatically applies the current PM Surya Ghar subsidy slabs (up to ₹78,000) based on your recommended system size. Commercial properties are not eligible under this scheme, so the subsidy field won’t apply to commercial estimates.
6 How much roof space is required for solar panels?
Typically, a 1 kW rooftop solar system requires approximately 80–100 square feet of shadow-free roof area. The exact requirement depends on panel technology and installation design.
7 Can businesses use a solar calculator?
Yes. Commercial properties can use the calculator to estimate solar capacity, installation cost, generation, and potential savings – though the government subsidy shown applies to residential installations only.
8 Is the calculator result the final solar quotation?
No. It’s an initial estimate. Final pricing and system design are confirmed after a detailed, free site survey.
9How long does it take to recover my investment?
Most residential systems pay back their effective investment within roughly 3–4 years through electricity bill savings, after which the system continues generating largely free electricity for the remainder of its typical 20–25 year lifespan.