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Solar Loan EMI Calculator

Solar financing, EMI, cash-flow and payback calculator — reducing-balance EMI, amortisation schedule, solar savings projection and cash-vs-loan comparison.

Financial

Core inputs only — quick sizing with engineering defaults.

Inputs (SI units)

Total solar project costcurrency

Full turnkey cost of the solar PV system before subsidy or down payment.

Down paymentcurrency

Paid upfront from your own funds. Cannot exceed the project cost.

Subsidy / incentivecurrency

Treated as a reduction of the financed amount: Loan = Project cost − Down payment − Subsidy.

Annual interest rate%

Nominal reducing-balance rate. 0% is valid (interest-free scheme).

Loan tenureyears

Repayment period in years; the equivalent number of months is shown in the results.

Processing fee% of loan

One-time lender fee, calculated on the loan amount.

Expected monthly solar savingscurrency/mo

Year-1 electricity bill savings from the solar system.

Results

Monthly EMI

9,672

Fixed reducing-balance EMI.

Loan amount

450,000

Project cost − down payment − subsidy

Number of instalments

60 months (5 years)

Total principal repaid

450,000

Total interest paid

130,335

Total loan repayment

580,335

Processing fee

4,500

Paid upfront, not added to the principal

Down payment

50,000

Subsidy / incentive

Total upfront cost

54,500

Down payment + processing fee

Total financing cost

134,835

Interest + processing fee — the extra cost of borrowing versus paying cash

Expected monthly solar savings

4,000 /mo

Net monthly cash flow during loan

-5,672 /mo

Solar savings do not fully cover the EMI under these assumptions.

Estimated loan payoff

60 months (5 years)

Estimated solar payback period

11.2 years

First point where cumulative net cash flow turns positive.

Estimated cumulative savings (25 yr)

1,813,905

Estimated projection based on your assumptions.

⚠ WARNING — Solar savings do not fully cover the EMI under these assumptions — expect a monthly shortfall until savings grow or the loan ends.

✓ PASS — Amortisation schedule closes at zero balance within numerical tolerance.

✓ PASS — Estimated payback at 11.2 years based on your assumptions.

Financing & solar cash-flow charts

Charts update instantly with your inputs. Projections are estimates based on your assumptions.

Amortisation — yearly summary

Closing balance reaches zero at the final instalment. Interest is always charged on the outstanding balance.

Amortisation — yearly summary
Year	Opening balance	Total EMI paid	Principal paid	Interest paid	Closing balance
1	450,000	116,067	72,227	43,840	377,773
2	377,773	116,067	80,187	35,880	297,585
3	297,585	116,067	89,024	27,043	208,561
4	208,561	116,067	98,835	17,232	109,727
5	109,727	116,067	109,727	6,340	0

Amortisation — monthly schedule (first 24 of 60 instalments)

The complete month-by-month schedule is included in the calculation log and in the PDF/Excel export.

Amortisation — monthly schedule (first 24 of 60 instalments)
Month	Opening balance	EMI	Interest	Principal	Closing balance
1	450,000	9,672	3,938	5,735	444,265
2	444,265	9,672	3,887	5,785	438,480
3	438,480	9,672	3,837	5,836	432,645
4	432,645	9,672	3,786	5,887	426,758
5	426,758	9,672	3,734	5,938	420,820
6	420,820	9,672	3,682	5,990	414,830
7	414,830	9,672	3,630	6,042	408,787
8	408,787	9,672	3,577	6,095	402,692
9	402,692	9,672	3,524	6,149	396,543
10	396,543	9,672	3,470	6,203	390,341
11	390,341	9,672	3,415	6,257	384,084
12	384,084	9,672	3,361	6,312	377,773
13	377,773	9,672	3,306	6,367	371,406
14	371,406	9,672	3,250	6,422	364,983
15	364,983	9,672	3,194	6,479	358,505
16	358,505	9,672	3,137	6,535	351,969
17	351,969	9,672	3,080	6,593	345,377
18	345,377	9,672	3,022	6,650	338,727
19	338,727	9,672	2,964	6,708	332,018
20	332,018	9,672	2,905	6,767	325,251
21	325,251	9,672	2,846	6,826	318,425
22	318,425	9,672	2,786	6,886	311,539
23	311,539	9,672	2,726	6,946	304,593
24	304,593	9,672	2,665	7,007	297,585

Estimated annual solar cash-flow projection

Estimated projection based on user assumptions — not a guarantee of savings, tariff or system performance.

Estimated annual solar cash-flow projection
Year	Estimated solar savings	Loan EMI paid	Interest paid	Principal paid	Net annual cash flow	Cumulative net cash flow
1	48,000	116,067	43,840	72,227	-68,067	-122,567
2	49,571	116,067	35,880	80,187	-66,497	-189,064
3	51,193	116,067	27,043	89,024	-64,875	-253,938
4	52,868	116,067	17,232	98,835	-63,200	-317,138
5	54,597	116,067	6,340	109,727	-61,470	-378,607
6	56,384	0	0	0	56,384	-322,224
7	58,229	0	0	0	58,229	-263,995
8	60,134	0	0	0	60,134	-203,861
9	62,101	0	0	0	62,101	-141,760
10	64,133	0	0	0	64,133	-77,626
11	66,232	0	0	0	66,232	-11,394
12	68,399	0	0	0	68,399	57,005
13	70,637	0	0	0	70,637	127,642
14	72,948	0	0	0	72,948	200,590
15	75,335	0	0	0	75,335	275,925
16	77,800	0	0	0	77,800	353,725
17	80,346	0	0	0	80,346	434,071
18	82,975	0	0	0	82,975	517,046
19	85,690	0	0	0	85,690	602,735
20	88,493	0	0	0	88,493	691,228
21	91,389	0	0	0	91,389	782,617
22	94,379	0	0	0	94,379	876,996
23	97,467	0	0	0	97,467	974,463
24	100,656	0	0	0	100,656	1,075,120
25	103,950	0	0	0	103,950	1,179,069

Cash purchase vs solar loan

Financing usually increases the total project cost through interest and fees, but greatly reduces the cash needed upfront.

Cash purchase vs solar loan
Item	Cash purchase	Solar loan
Initial cash required	500,000	54,500
Financing cost	0	134,835
Interest paid	0	130,335
Processing fee	0	4,500
Monthly EMI	0	9,672
Expected monthly solar savings (yr 1)	4,000	4,000
Net monthly cash flow (yr 1)	4,000	-5,672
Total estimated cost	500,000	634,835
Estimated payback	9.1 years	11.2 years
Estimated cumulative savings (25 yr)	1,813,905	1,813,905

Sensitivity Analysis

Effect of varying Annual interest rate by ±30% on Monthly EMI.

Input change	Monthly EMI	Impact
-30%	8,985	-7.1%
-20%	9,211	-4.8%
-10%	9,440	-2.4%
+0%	9,672	0.0%
+10%	9,908	+2.4%
+20%	10,147	+4.9%
+30%	10,389	+7.4%

Engineering Recommendations

→Compare the EMI against realistic solar savings for your tariff and site, not best-case generation.
→Financing spreads the cost but adds interest and fees — check the total financing cost line before choosing a longer tenure.
→Estimated projection based on user assumptions. Actual EMI, subsidy eligibility, fees, tariffs and system performance vary by lender, location and project.
→Engineering-grade preliminary calculation. Final design must be verified against project-specific site conditions, manufacturer datasheets, applicable standards and utility requirements.

Detailed Calculation Log

Month | Opening balance | EMI | Interest | Principal | Closing balance
1 | 450,000 | 9,672 | 3,938 | 5,735 | 444,265
2 | 444,265 | 9,672 | 3,887 | 5,785 | 438,480
3 | 438,480 | 9,672 | 3,837 | 5,836 | 432,645
4 | 432,645 | 9,672 | 3,786 | 5,887 | 426,758
5 | 426,758 | 9,672 | 3,734 | 5,938 | 420,820
6 | 420,820 | 9,672 | 3,682 | 5,990 | 414,830
7 | 414,830 | 9,672 | 3,630 | 6,042 | 408,787
8 | 408,787 | 9,672 | 3,577 | 6,095 | 402,692
9 | 402,692 | 9,672 | 3,524 | 6,149 | 396,543
10 | 396,543 | 9,672 | 3,470 | 6,203 | 390,341
11 | 390,341 | 9,672 | 3,415 | 6,257 | 384,084
12 | 384,084 | 9,672 | 3,361 | 6,312 | 377,773
13 | 377,773 | 9,672 | 3,306 | 6,367 | 371,406
14 | 371,406 | 9,672 | 3,250 | 6,422 | 364,983
15 | 364,983 | 9,672 | 3,194 | 6,479 | 358,505
16 | 358,505 | 9,672 | 3,137 | 6,535 | 351,969
17 | 351,969 | 9,672 | 3,080 | 6,593 | 345,377
18 | 345,377 | 9,672 | 3,022 | 6,650 | 338,727
19 | 338,727 | 9,672 | 2,964 | 6,708 | 332,018
20 | 332,018 | 9,672 | 2,905 | 6,767 | 325,251
21 | 325,251 | 9,672 | 2,846 | 6,826 | 318,425
22 | 318,425 | 9,672 | 2,786 | 6,886 | 311,539
23 | 311,539 | 9,672 | 2,726 | 6,946 | 304,593
24 | 304,593 | 9,672 | 2,665 | 7,007 | 297,585
25 | 297,585 | 9,672 | 2,604 | 7,068 | 290,517
26 | 290,517 | 9,672 | 2,542 | 7,130 | 283,387
27 | 283,387 | 9,672 | 2,480 | 7,193 | 276,194
28 | 276,194 | 9,672 | 2,417 | 7,256 | 268,939
29 | 268,939 | 9,672 | 2,353 | 7,319 | 261,620
30 | 261,620 | 9,672 | 2,289 | 7,383 | 254,237
31 | 254,237 | 9,672 | 2,225 | 7,448 | 246,789
32 | 246,789 | 9,672 | 2,159 | 7,513 | 239,276
33 | 239,276 | 9,672 | 2,094 | 7,579 | 231,697
34 | 231,697 | 9,672 | 2,027 | 7,645 | 224,053
35 | 224,053 | 9,672 | 1,960 | 7,712 | 216,341
36 | 216,341 | 9,672 | 1,893 | 7,779 | 208,561
37 | 208,561 | 9,672 | 1,825 | 7,847 | 200,714
38 | 200,714 | 9,672 | 1,756 | 7,916 | 192,798
39 | 192,798 | 9,672 | 1,687 | 7,985 | 184,813
40 | 184,813 | 9,672 | 1,617 | 8,055 | 176,758
41 | 176,758 | 9,672 | 1,547 | 8,126 | 168,632
42 | 168,632 | 9,672 | 1,476 | 8,197 | 160,435
43 | 160,435 | 9,672 | 1,404 | 8,268 | 152,167
44 | 152,167 | 9,672 | 1,331 | 8,341 | 143,826
45 | 143,826 | 9,672 | 1,258 | 8,414 | 135,412
46 | 135,412 | 9,672 | 1,185 | 8,487 | 126,925
47 | 126,925 | 9,672 | 1,111 | 8,562 | 118,363
48 | 118,363 | 9,672 | 1,036 | 8,637 | 109,727
49 | 109,727 | 9,672 | 960 | 8,712 | 101,015
50 | 101,015 | 9,672 | 884 | 8,788 | 92,226
51 | 92,226 | 9,672 | 807 | 8,865 | 83,361
52 | 83,361 | 9,672 | 729 | 8,943 | 74,418
53 | 74,418 | 9,672 | 651 | 9,021 | 65,397
54 | 65,397 | 9,672 | 572 | 9,100 | 56,297
55 | 56,297 | 9,672 | 493 | 9,180 | 47,117
56 | 47,117 | 9,672 | 412 | 9,260 | 37,857
57 | 37,857 | 9,672 | 331 | 9,341 | 28,516
58 | 28,516 | 9,672 | 250 | 9,423 | 19,094
59 | 19,094 | 9,672 | 167 | 9,505 | 9,588
60 | 9,588 | 9,672 | 84 | 9,588 | 0

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Engineering Formula

Loan amount = Project cost − Down payment − Subsidy
i = annual rate / 1200, n = tenure × 12
EMI = P × i × (1+i)ⁿ / ((1+i)ⁿ − 1) (if i = 0, EMI = P / n)
Interest_month = Opening balance × i; Principal_month = EMI − Interest_month
Closing balance = Opening balance − Principal_month
Processing fee = Loan amount × fee %
Net monthly cash flow = Monthly solar savings − EMI
Savings_year = Savings_prev × (1 + escalation) × (1 − degradation)

Solar loans are amortised on a reducing balance: each instalment first pays the interest accrued on the outstanding principal, and the remainder reduces the principal, so interest falls month after month. This calculator sizes the financed amount after down payment and subsidy, builds the full amortisation schedule, then compares the EMI against your expected solar savings to show net monthly cash flow, cumulative savings and estimated payback. Lenders differ in how they treat processing fees, moratoriums and floating-rate resets, so the optional assumptions are yours to define.

Step-by-step Calculation

1.Loan amountProject cost − down payment − subsidy450,000
2.Monthly interest rateannual rate ÷ 12 ÷ 1000.00875
3.Number of instalmentstenure × 1260
4.EMIP·i·(1+i)ⁿ ÷ ((1+i)ⁿ − 1)9,672
5.Monthly interestopening balance × monthly rate3,938
6.Monthly principalEMI − interest5,735
7.Total interestΣ monthly interest on the outstanding balance130,335
8.Total repaymentΣ instalments actually paid580,335
9.Processing feeloan amount × fee %4,500
10.Total financing costinterest + processing fee134,835
11.Net monthly cash flowmonthly solar savings − EMI-5,672
12.Final closing balancemust reach zero0

Outstanding loan balance by year

377,773

297,585

208,561

109,727

How to use this calculator: Solar Loan EMI Calculator

Solar financing, EMI, cash-flow and payback calculator — reducing-balance EMI, amortisation schedule, solar savings projection and cash-vs-loan comparison. The example below is calculated by this page's real engine from the displayed inputs.

1Confirm that the Solar Loan EMI Calculator matches the quantity or design check you need.
2Enter Total solar project cost, Down payment, and Subsidy / incentive using the units printed beside each field.
3Select the applicable Processing fee treatment, Loan type (user-defined scenario), and Optional prepayment options; these choices change the calculation method or factors.
4Calculate, then follow the substituted equations in the worked example and compare the result with any stated limit.
5Read the assumptions, warnings and cited references before using the result for a financial, medical or engineering decision.

Input guide and example values

Use values from the same measurement basis and time period. Conditional fields appear only when the related option is selected.

Input	Example value	Why it matters
Total solar project cost	500000 currency	Full turnkey cost of the solar PV system before subsidy or down payment.
Down payment	50000 currency	Paid upfront from your own funds. Cannot exceed the project cost.
Subsidy / incentive	0 currency	Treated as a reduction of the financed amount: Loan = Project cost − Down payment − Subsidy.
Annual interest rate	10.5 %	Nominal reducing-balance rate. 0% is valid (interest-free scheme).
Loan tenure	5 years	Repayment period in years; the equivalent number of months is shown in the results.
Processing fee	1 % of loan	One-time lender fee, calculated on the loan amount.
Processing fee treatment	Paid upfront (not added to loan)	By default the fee is NOT capitalised into the principal.
Expected monthly solar savings	4000 currency/mo	Year-1 electricity bill savings from the solar system.
Annual electricity cost escalation	4 %/yr	Tariff inflation assumption — increases the money value of the same solar kWh each year.
Annual solar generation degradation	0.7 %/yr	PV output declines slightly each year, reducing kWh saved. Typical warranty basis is 0.5–0.8 %/yr.
Projection period	25 years	Horizon used for the savings projection and payback search.
Loan type (user-defined scenario)	Fixed rate	Floating is a what-if scenario you define — it is not a forecast of actual lender rates.
Optional prepayment	Disabled	Select the option that matches the real installation or scenario.
Optional grace / pre-EMI period	Disabled	Select the option that matches the real installation or scenario.

Formula inputs & variables for Solar Loan EMI Calculator

These are the named quantities used by this calculator. When the source formula does not define a mathematical symbol, OneCalcApp keeps the real input label instead of inventing one.

Variable / input	Unit	Meaning in this calculation
Total solar project cost	currency	Full turnkey cost of the solar PV system before subsidy or down payment.
Down payment	currency	Paid upfront from your own funds. Cannot exceed the project cost.
Subsidy / incentive	currency	Treated as a reduction of the financed amount: Loan = Project cost − Down payment − Subsidy.
Annual interest rate	%	Nominal reducing-balance rate. 0% is valid (interest-free scheme).
Loan tenure	years	Repayment period in years; the equivalent number of months is shown in the results.
Processing fee	% of loan	One-time lender fee, calculated on the loan amount.
Processing fee treatment	—	By default the fee is NOT capitalised into the principal.
Expected monthly solar savings	currency/mo	Year-1 electricity bill savings from the solar system.

Understanding the result

Read the main result together with supporting checks, assumptions, limits and intermediate values.

For a manual check, repeat the first equation, confirm the units and change one input at a time.

Common mistakes when using Solar Loan EMI Calculator

Do not mix units for Total solar project cost (currency), Down payment (currency), Subsidy / incentive (currency). A unit mismatch changes the input magnitude even when the typed number looks reasonable.
Do not leave Processing fee treatment on the default choice unless that choice matches the real scenario; the selected option can change the calculation path or factor.
Do not replace the displayed Loan amount = Project cost − Down payment − Subsidy relationship with a different convention without also changing the underlying assumptions; compare like-for-like methods when checking the result.
Do not treat Monthly EMI = 9,672 from the worked example as a universal answer. It belongs to the displayed example inputs and must be recalculated for the actual case.

Next logical calculator

Continue with Compound Interest Calculator

Useful next check because both tools use Annual interest rate, while Compound Interest Calculator answers a different part of the same workflow.

Open Compound Interest Calculator

Standards, source trail and limitations

References show the method used. Check the current local edition, amendments and project specification before a regulated decision.

Solar Loan EMI Calculator — Technical Guide

How Solar Loan EMI Is Calculated

The loan principal is what remains after your own contribution: Loan amount = project cost − down payment − subsidy. The monthly interest rate is the annual rate divided by 12 and by 100, and the number of instalments is the tenure in years multiplied by 12. The EMI is then EMI = P × i × (1+i)ⁿ / ((1+i)ⁿ − 1), where P is the principal, i the monthly rate and n the number of instalments. When the rate is 0%, the EMI is simply the principal divided by the number of months. Each month, interest is charged on the outstanding balance (interest = opening balance × i), the rest of the instalment reduces the principal (principal = EMI − interest), and the closing balance becomes the next month's opening balance. Because the balance falls every month, the interest portion shrinks and the principal portion grows. The final instalment is adjusted so the balance closes at zero. Not every lender structures loans identically — some charge fees upfront, some capitalise them, and some reset the EMI on floating-rate resets.

How Solar Financing Works

Solar financing follows a simple chain: project cost → down payment → subsidy or incentive → financed amount → EMI → solar savings → net cash flow → loan payoff → long-term savings. You pay part of the system cost upfront, any subsidy reduces what has to be borrowed, and the balance is financed over a fixed tenure. Every month the system reduces your electricity bill, and that saving offsets the EMI. If savings exceed the EMI, the project is cash-flow positive from day one; if not, there is a monthly shortfall that usually narrows as tariffs rise. Once the loan is paid off, the EMI stops but the savings continue for the remaining life of the system — that is where most of the lifetime value comes from.

Worked Example (Illustrative Only)

Project cost 500,000; down payment 50,000; subsidy 0; loan amount 450,000; interest rate 10.5% per year; tenure 5 years (60 months); processing fee 1% = 4,500. The EMI works out to roughly 9,671 per month, total repayment about 580,270 and total interest about 130,270. With expected monthly solar savings of 4,000, the net monthly cash flow during the loan is about −5,671, meaning the savings do not fully cover the EMI in the early years under these assumptions. Illustrative example only. Actual loan terms and solar savings depend on the lender, project, location, tariff, system performance and user assumptions.

Important Financial Disclaimer

This calculator provides estimates for planning and comparison purposes only. Actual EMI, interest, fees, subsidy eligibility, loan terms, electricity savings and solar payback may vary by lender, financing product, location, tariff, system performance and applicable regulations. Verify final terms with the lender and applicable authorities before making a financial decision.

Engineering Explanation

What is a solar loan EMI calculator?+

It is a solar financing tool that works out the equated monthly instalment for the amount you borrow to install a solar PV system, then shows the amortisation schedule, total interest, processing fee, net monthly cash flow against solar savings and the estimated payback period.

How is solar loan EMI calculated?+

On a reducing balance: EMI = P × i × (1+i)ⁿ / ((1+i)ⁿ − 1), where P is the financed amount, i is the annual rate divided by 1200 and n is the tenure in months. Each month interest is charged on the outstanding balance and the rest of the instalment repays principal.

How much down payment is needed for a solar loan?+

It depends entirely on the lender and product — commonly 10–30% of the project cost, though some schemes offer higher financing. A larger down payment reduces the loan amount, the EMI and the total interest, but ties up more cash upfront.

Does a solar subsidy reduce the loan amount?+

In most schemes yes: the subsidy is netted off the project cost, so you finance project cost − down payment − subsidy. If the subsidy is disbursed after commissioning, you may need to borrow the full amount first and prepay once it arrives — check the disbursal timing with your lender.

How does the solar loan interest rate affect EMI?+

The EMI rises with the rate, but total interest rises much faster on longer tenures. Use the sensitivity panel to see how a one-percentage-point change moves both the EMI and the total financing cost.

Can solar savings cover the monthly EMI?+

Sometimes. Longer tenures produce a smaller EMI that is easier to cover with savings, while short tenures usually leave a shortfall in the early years. The calculator shows whether savings exceed the EMI under your assumptions — it does not assume they will.

Is a longer solar loan tenure cheaper?+

A longer tenure lowers the monthly EMI but increases the total interest paid, so the project costs more overall. Compare the monthly cash-flow benefit against the extra total financing cost shown in the results.

What is the difference between solar loan EMI and total repayment?+

The EMI is the fixed monthly instalment; the total repayment is the EMI multiplied by the number of instalments (plus any pre-EMI interest or prepayments). Total repayment minus the loan amount is the interest you pay.

How does a processing fee affect the total financing cost?+

The processing fee is a one-time charge on the loan amount. If paid upfront it increases your initial cash outlay; if capitalised it increases the principal and therefore both the EMI and the interest. Total financing cost = interest + processing fee.

How can I compare solar financing with paying cash?+

Use the cash purchase vs solar loan table. Paying cash avoids interest and fees, so the total cost is lower and payback is quicker, but it requires the full amount upfront. Financing keeps cash free at the price of interest and fees.

Design Assumptions

• Monthly reducing-balance amortisation with equal instalments unless prepayment or a floating-rate scenario is enabled.
• The subsidy is treated as a reduction of the financed amount, not as a separate cash inflow.
• The processing fee is not capitalised into the principal unless you explicitly select that option.
• Solar savings projections use your escalation and degradation assumptions and are estimates, not guarantees.

Engineering Tips

◆Compare the EMI against realistic monthly solar savings before choosing a tenure — a longer tenure lowers the EMI but raises total interest.
◆Use the cash purchase vs solar loan table to see how much extra the financing costs and how much upfront cash it saves.
◆Model a small monthly prepayment — even a modest amount can shorten the loan and cut total interest noticeably.

Warnings

▲Actual EMI, subsidy eligibility, fees and loan terms vary by lender — verify with a sanction letter before committing.
▲Floating-rate results are a user-defined scenario, not a forecast of future bank interest rates.
▲Projected savings depend on tariff, location and system performance; they are estimates and not guaranteed returns.

Standards & References

RBI reducing-balance conventionLender-specific sanction terms

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