Jaipur Solar Calculator (JVVNL)

Rooftop solar payback for Jaipur on JVVNL, with Rajasthan's ₹17,000 top-up and some of India's strongest sunshine.

Your home

Average monthly electricity bill

₹

₹100₹50K

About 323 units a month on the JVVNL tariff. Use a year's average if your bill swings with the seasons.

Roof type

RCC flat roof

RCC, elevated structure

Metal sheet roof

Fine-tune

System size

Sized to cover a year of your consumption, at 5.9 peak sun hours a day in Rajasthan.

Usable shadow-free roof area (optional)

sq ft

About 100 sq ft per kW. Leave at 0 for no limit.

Installed cost per kW, GST included

₹

Typical for an on-grid system from an empanelled vendor. Replace it with your quote.

Yearly rise in electricity prices

0%15%

Indian residential tariffs have historically risen 4-7% a year.

Panel output lost each year

0%2%

Monocrystalline panels typically lose about 0.5% a year.

How you pay

Upfront

Solar loan

Pays for itself in1.8 yearsthen ₹15.07 L ahead after 25 years

A 2.5 kW system makes about 345 units a month, 100% of your use. Your bill drops from ₹3,000 to about ₹150 in year one.

Installed cost: ₹1,50,000
PM Surya Ghar subsidy: − ₹69,000
State top-up: − ₹17,000; Rajasthan state top-up
Net cost to you: ₹64,000
Saving in year one: ₹35,043
Return (IRR): 59.2% a year; over 25 years, before tax
CO₂ avoided: 70 tonnes; over 25 years

Subsidy57%

You pay43%
Central subsidy46%
State top-up11%

Your money over 25 yearsStill to recoverAhead

Year-by-year cash flowShow

Year	Units made	Bills without solar	Bills with solar	Upkeep and EMIs	Running total
1	4,145	₹36,008	₹1,800	₹0	-₹28,956
2	4,125	₹37,809	₹1,890	₹0	₹7,734
3	4,104	₹39,699	₹1,985	₹0	₹46,156
4	4,084	₹41,684	₹2,084	₹0	₹86,400
5	4,063	₹43,768	₹2,188	₹0	₹1,28,561
6	4,043	₹45,957	₹2,297	₹1,500	₹1,71,238
7	4,023	₹48,255	₹2,412	₹1,500	₹2,16,035
8	4,003	₹50,667	₹2,533	₹1,500	₹2,63,062
9	3,983	₹53,201	₹2,659	₹1,500	₹3,12,433
10	3,963	₹55,861	₹2,792	₹1,500	₹3,64,270
11	3,943	₹58,654	₹2,932	₹1,500	₹4,18,699
12	3,923	₹61,587	₹3,079	₹19,000	₹4,58,353
13	3,903	₹64,666	₹3,233	₹1,500	₹5,18,372
14	3,884	₹67,899	₹3,394	₹1,500	₹5,81,402
15	3,865	₹71,294	₹3,703	₹1,500	₹6,47,493
16	3,845	₹74,859	₹4,135	₹1,500	₹7,16,716
17	3,826	₹78,602	₹4,601	₹1,500	₹7,89,217
18	3,807	₹82,532	₹5,100	₹1,500	₹8,65,149
19	3,788	₹86,659	₹5,637	₹1,500	₹9,44,671
20	3,769	₹90,991	₹6,213	₹1,500	₹10,27,949
21	3,750	₹95,541	₹6,831	₹1,500	₹11,15,159
22	3,731	₹1,00,318	₹7,494	₹1,500	₹12,06,483
23	3,713	₹1,05,334	₹8,204	₹1,500	₹13,02,113
24	3,694	₹1,10,601	₹8,965	₹1,500	₹14,02,248
25	3,676	₹1,16,131	₹9,780	₹1,500	₹15,07,099

How it works

The bill you enter is worked backwards through your DISCOM's slabs, fixed charges, surcharges and duty to the units you use. The panels' yearly output is set against that use under net metering, and each month is re-billed on what is left. Because the units solar removes come off your most expensive slab first, the saving per unit is often well above the average rate on your bill. Tariffs rise by the escalation rate each year while the panels slowly lose output; maintenance, an inverter replacement in year 12 and any loan repayments are taken off, and the running total gives the payback year.

Saving₍y₎ = [Bill(U) − Bill(U − G₍y₎/12)] × 12 × (1 + e)^(y−1),  G₍y₎ = kW × H × 365 × PR × (1 − d)^(y−1)

U: Units you use a month, worked out from your bill
G₍y₎: Units the panels make in year y
H: Peak sun hours a day in your state
PR: Performance ratio: the share of rated output that reaches the meter, 0.77 here
e: Yearly rise in electricity prices
d: Yearly loss in panel output

Worked example

A Jaipur home on JVVNL with a ₹2,500 monthly bill and a flat RCC roof, assuming prices rise 5% a year.

1Working the bill back through the JVVNL slabs, charges and duty gives about 287 units a month
2At 5.9 peak sun hours, 2 kW makes about 276 units a month, 96% of that use
32 kW at ₹60,000 per kW costs ₹1,20,000; PM Surya Ghar pays ₹60,000 and the Rajasthan state top-up ₹17,000, leaving ₹43,000
4The first year saves ₹27,395, and the saving grows as tariffs rise

The system pays for itself in about 1.5 years and leaves the household about ₹11,58,893 ahead over 25 years.

Frequently asked questions

Why do fixed charges fall when solar is installed in Rajasthan?

Rajasthan sets the domestic fixed charge by the month's billed units: ₹150 up to 150 units, rising to ₹800 above 500. Under net metering the billed units are what remains after solar, so a smaller net bill also drops you into a lower fixed-charge band.

How much does a kW of panels make in Jaipur?

About 4.5 units a day on average, or around 1,650 a year, among the highest in India, thanks to close to six peak sun hours a day. A home using 300 units a month needs only a little over 2 kW.

How does net metering settle on JVVNL?

Net metering with surplus settled yearly at the RERC-approved rate.

How much is the PM Surya Ghar subsidy?

₹30,000 per kW for the first 2 kW and ₹18,000 for the third, so ₹30,000 for 1 kW, ₹60,000 for 2 kW and ₹78,000 for 3 kW or more. It is paid into your bank account after the DISCOM inspects and commissions the system, and only for installations by an empanelled vendor using ALMM-listed panels, applied for through pmsuryaghar.gov.in.

Why is my saving per unit higher than my average rate?

Residential tariffs are telescopic: the first units are cheap and each slab above costs more. Solar takes units off the top of your bill, so it removes the dearest ones first. A home in a ₹10-plus slab saves that rate on every unit the panels cover, even if the bill averages out lower.

Why not simply fit the biggest system my roof will hold?

The central subsidy stops rising at 3 kW, and under net metering surplus units are usually bought back at the regulator's average power purchase cost, often ₹2-3 a unit, far below what you pay for grid power. Sizing to your own consumption earns the full retail rate on every unit. The calculator suggests that size; override it to see what a bigger system does to the return.