What will my solar EMI be?
Four things about your own system, your own bill and what your bank told you. We will show you the monthly payment, what you will still be paying to the grid while it runs, what happens once it ends, and what the loan added to the price in total. Every figure below traces back to a number you typed or an assumption we have labelled.
This decides how much of your solar you get to use yourself, and therefore how much a battery could help. A house that uses its power in the evening can store far more midday solar than one that uses it at noon.
Why bill and units are asked separately
You only need one of them. Enter your bill and we divide it by your units to work out what a unit costs you, which is the price every saving on this page is valued at. Enter your units and we work the bill back from them.
Your bill also includes fixed charges, taxes and demand charges that solar does not reduce, so a bill divided by its units slightly overstates what one displaced unit is really worth. It is the right number for comparing one month against another, which is what this page does. If you know your tariff properly, enter the real unit price under Advanced settings.
Optional: what your system actually makes
Leave this empty and we use 1,440 units for each kW, which is a middle of the road figure. If you have a number off your inverter or a bill, enter it here instead: a real measurement beats an average every time.
Everything you hand over across the whole loan, including interest. Not the price of the system.
Leave this empty unless your bank quoted a rate. Otherwise we work it out from the payment or the total.
Why a total works as well as a rate
A loan is fully described by how much you borrowed, what you pay each month, and how many months you pay for. Many banks quote the total rather than the rate, because it is the number they want you comparing.
Divide your total by the number of months to get the monthly payment, then find the rate that makes those payments add up to what you borrowed. That is the rate you are really paying. We report it as a percentage a year, and also as the slightly higher figure you get once monthly payments are put together, which is why a quoted 9% often reads as about 9.7% here.
If your total is smaller than the amount borrowed, the figures do not describe a real loan and we will say so rather than produce a payment. That happens most often when a fee has been deducted from the loan so the amount that reached the installer is less than the amount signed for.
Fill in the boxes above and your answer appears here.
Paying cash against paying with this loan
The same system, bought two ways. Over the same period, the only difference between these two totals is the interest.
Over 25 years
These are three separate things, so they are three separate lines. Money you did not spend, money the grid paid you, and money you handed over, are never added into one figure before you see them.
Where you stand over 25 years
Advanced settings
Price rises are applied to what you pay and never to what the grid pays you, because no utility has to raise its buy-back price in step with what it charges. The rate is left at zero, so no headline on this page assumes prices go up.
Solar EMI Calculator FAQs
How is my monthly solar loan payment calculated?
Your monthly payment depends on the amount financed, the loan interest rate, and the number of monthly payments. If your bank gives you the monthly payment or total amount repayable instead of an interest rate, the calculator can estimate the implied rate when the repayment structure is suitable for a standard equal-payment loan.
My bank gave me the total amount I will repay. Can I still calculate my solar EMI?
Yes. The calculator can use the total repayment amount and loan duration to determine the implied monthly payment. If enough information is available, it can also estimate the interest rate under a standard equal-payment loan assumption.
Will my electricity bill go down if I buy solar on installments?
Your grid electricity cost may fall because some of your electricity comes from solar instead of the grid. During the loan period, you also have the solar installment to pay. The calculator shows both separately and then shows your total monthly expense.
Is paying cash for solar cheaper than taking a loan?
When the same solar system costs the same upfront and the loan adds interest or financing fees, paying cash costs less in total. Financing can spread the payment over several years, so the calculator compares both the total cost and the monthly cash flow.
What happens to extra solar electricity?
If your solar system produces more electricity than your home can use at that time, the extra energy may be stored in a battery or exported to the grid, depending on your setup and local electricity rules. The calculator keeps bill savings and grid export income separate.
Can I add a battery to my solar system?
A battery can store some of your unused solar electricity for later use. The calculator estimates the additional savings from the battery rather than crediting the battery with the savings produced by the solar panels themselves.
How accurate is the solar EMI calculator?
The result is a planning estimate, not a bank loan offer or a guaranteed electricity bill. Results depend on the assumptions used for solar generation, electricity prices, financing terms, system performance and other costs. Your bank's final repayment schedule and your actual electricity usage will determine the final figures.
Where to go next
This is a planning calculator, not a bankable financial model. It answers three practical questions: what your monthly solar payment would be, what you will still pay to the grid while it runs, and what you pay once it has ended. It cannot see your roof, your shading, your equipment or your bank's final terms, so the result is an estimate. Use it to compare a loan against paying cash and one loan against another, then confirm the numbers with a site-specific assessment and a written quote before you sign anything.