Solar Calculators | Smart Energy Solutions – Bihar, India

Free Solar Tools

Calculate your
solar future
in seconds.

Seven precision calculators to help you plan, finance, and optimise your solar investment — built by Smart Energy Solutions, Bihar's trusted solar company.

Panel Size Savings ROI Rooftop EMI CO₂ Units
Calculator 1 of 7

Solar Panel Size Calculator

Enter your monthly electricity consumption to find out exactly how much solar capacity you need.

Your Energy Profile
₹
₹6.50 per kWh
5.0 hrs/day (Bihar avg ≈ 5)

Enter your electricity bill above and tap Calculate to see your ideal solar system size.

How it's calculated
We divide your monthly units by peak sun hours × 30 days, then add a 20% efficiency buffer for inverter losses, soiling, and temperature derating.
Bihar Sun Hours
Bihar receives 4.5–5.5 peak sun hours/day on average. Samastipur and Patna both fall in the 5.0 hr/day range — ideal for solar.
Subsidy Available
Under PM Surya Ghar, residential systems up to 3 kW attract a ₹30,000/kW subsidy. Systems 3–10 kW get ₹18,000/kW for the next 7 kW.
Calculator 2 of 7

Monthly Savings Calculator

See how much you'll save every month — and every year — once your solar panels are live.

Savings Inputs
3 kWkilowatts
₹6.50per kWh
5.0hrs/day
5%per year

Adjust the sliders and hit Calculate to see your projected savings.

Calculator 3 of 7

ROI & Payback Calculator

Find out how quickly your solar system pays for itself and what return it delivers over 25 years.

Investment Details
₹
₹
₹
5%per year

Enter your system cost and savings to calculate your payback period and lifetime ROI.

Calculator 4 of 7

Rooftop Area Calculator

Find out how many kW you can install given your available rooftop area — and if your roof is solar-ready.

Rooftop Details
ft
ft

Enter your roof dimensions to find out how much solar you can install.

Calculator 5 of 7

Solar Loan & EMI Calculator

Plan your solar financing. Calculate EMI, total interest, and total cost for any loan amount and tenure.

Loan Details
₹1,00,000principal
9%per annum
₹

Set your loan amount, rate and tenure to see your monthly EMI.

Calculator 6 of 7

CO₂ Offset Calculator

Understand the environmental impact of going solar — in tonnes of CO₂, trees, and kilometres driven.

Environmental Inputs
3 kW
5.0hrs/day

Configure your system above to see your environmental impact over its lifetime.

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Daily & Monthly Units Generated

Know exactly how many units (kWh) your solar system will produce — daily, monthly, and annually.

Generation Inputs
3 kW
5.0hrs/day
20%soiling + inverter + temp
0.5%annual

Set your system parameters above to see projected generation figures.

Ready to go solar?

Let's design your perfect
solar system together

Our engineers in Bihar and across India will give you a free site survey, detailed quote, and help with subsidy applications — at no cost.

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