Smart Solar Sizing Tool

Find the Right Solar System for Your Home

Tell us about your home and get a personalised solar estimate in minutes.

🏠 This calculator is built for residential homes in Kerala. For commercial solar, chat with us on WhatsApp.

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5 min Time to complete

100% Personalised results

Free No cost, no commitment

MNRE Approved installer

High-efficiency solar panels on a rooftop

How it works

Your Home is Unique. Your Solar System Should Be Too.

Most solar quotes start with broad averages, not the realities of your home. Rayenna's solar calculator gives you a better planning estimate. Tell us about your home type, rooms, appliances, and EV usage, and we'll estimate system size, panel count, roof space, subsidy, and returns using current Kerala rooftop solar assumptions. It is a smart starting point you can refine further with a free site survey.

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Enter your details

Home type, rooms, and appliances

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Get your recommendation

System size, panels, and roof space

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See your savings

Payback period and lifetime savings

Step 1 of 4 — Your home

About Your Home

Home type

🏠 Independent house Standalone home

🏢 Apartment Flat / unit in a building

🏡 Villa Detached / gated villa

🏘 Row house Terraced / linked home

Bedrooms

Bathrooms

Floors

Your Personalised Solar Estimate

A planning estimate based on your inputs and current Kerala rooftop solar assumptions.

Recommended rooftop solar size

— kW

Estimated generation ~— units/year

Planning estimate Residential only Kerala market basis

Sized around your current bill, appliance mix, and daytime usage pattern.

Estimated annual savings —

Estimated payback —

Best fit for your home

Balanced family-home solar system

Sized from your appliance mix, current bill, and typical Kerala solar conditions.

Before you finalise

We confirm roof access, shade, structure, wiring runs, and final inverter placement during the free site survey before issuing a fixed proposal.

Daily consumption estimate

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Panels needed

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Roof space estimate

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Subsidy estimate

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Panel options — current Kerala residential pricing

Select a panel to compare roof use, cost, and long-term value.

— panels 22.8% efficiency — sq ft ₹29.5/W · — 30yr warranty

— panels 22.2% efficiency — sq ft ₹29/W · — 30yr warranty

— panels 21.8% efficiency — sq ft ₹28.5/W · — 30yr warranty

— panels 21.3% + bifacial gain — sq ft ₹28.5/W · — 30yr warranty

— panels 20.5% efficiency — sq ft ₹27.5/W · — 25yr warranty

Cost breakdown

Panel cost—

Inverter, mounting & installation—

Total system cost—

PM Surya Ghar subsidy—

Net cost to you—

Returns

Est. annual savings—

Estimated payback period—

Estimated 25-year savings—

CO₂ avoided over 25 years—

Get this estimate reviewed →

How this estimate is calculated

Solar yield basis

Assumes roughly 4.5 peak sun hours per day in Kerala, a performance ratio of 0.80, and a 25% sizing buffer for seasonal variation and real-world losses.

Cost basis

Panel prices and balance-of-system costs reflect current Kerala residential rooftop market assumptions for planning purposes, not a final fixed quote.

Savings basis

Annual savings are estimated from your current bill and typical on-grid residential usage. Actual savings vary with load timing, export credits, and site conditions.

What a site survey verifies

Roof access, shade-free area, structural suitability, cable routes, and final panel or inverter selection before we issue a fixed proposal.

Planning assumptions updated for Kerala market conditions — May 2026.

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Important notes on this estimate

What the cost includes
The total system cost shown covers solar PV modules, grid-tied inverter, mounting structure, DC & AC cabling, earthing, net-metering equipment, and complete installation by a certified team. No hidden line items. All applicable taxes and statutory levies, including GST, are additional and will be reflected in the final invoice.
For reference only
All figures are indicative estimates based on prevailing Kerala market rates. Actual costs vary with roof type, shadow analysis, panel brand selection, and site-specific civil work. Our team will conduct a detailed site visit and assessment and provide you with a precise, fixed proposal — at no charge.
About the subsidy
The PM Surya Ghar subsidy is shown as a deduction for illustrative purposes. In practice, the subsidy amount is credited directly to your bank account by the DISCOM or the relevant Government agency after system commissioning and verification — it is not an upfront discount on the invoice.

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Your data stays private

We don't store your inputs. This tool runs entirely in your browser.

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MNRE-approved installer

Every system we install qualifies for the full PM Surya Ghar subsidy.

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Free expert review

Not sure about your results? Our team will review them with you at no cost.

Find the Right Solar System for Your Home

Your Home is Unique. Your Solar System Should Be Too.

Enter your details

Get your recommendation

See your savings

About Your Home

Your Appliances

Your Usage Pattern

Your Personalised Solar Estimate

Balanced family-home solar system

N-Type TopCon 620W

N-Type TopCon 600W

N-Type TopCon 580W

Bifacial Dual Glass 580W

Mono PERC 540W

Your data stays private

MNRE-approved installer

Free expert review

Ready to go solar? Let's size your system together.