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Andhra Pradesh Solar Calculator (APSPDCL)

Rooftop solar payback for Andhra Pradesh homes on APERC's six-band tariff, from Visakhapatnam to Tirupati.

Updated · By Niraj Kumar · 1 source

Your home

Solar forSolar for
From your bill, enterFrom your bill, enter
₹
₹100₹50K

About 418 units a month on the APSPDCL tariff. Use a year's average if your bill swings with the seasons.

Roof typeRoof type

Fine-tune

kW

Sized to cover a year of your consumption, at 5.5 peak sun hours a day in Andhra Pradesh.

sq ft

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

₹

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

%
0%15%

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

%
0%2%

Monocrystalline panels typically lose about 0.5% a year.

How you payHow you pay
Pays for itself in2.8 yearsthen ₹14.31 L ahead after 25 years

A 3 kW system makes about 386 units a month, 92% of your use. Your bill drops from ₹3,000 to about ₹131 in year one.

Installed cost
₹1,80,000
PM Surya Ghar subsidy
− ₹78,000
Net cost to you
₹1,02,000
Saving in year one
₹34,438
Return (IRR)
38.0% a year
over 25 years, before tax
CO₂ avoided
79 tonnes
over 25 years
Subsidy43%
  • You pay57%
  • Central subsidy43%
Your money over 25 yearsStill to recoverAhead
₹-5 L₹0₹5 L₹10 L₹15 LPayback, year 2.804812162025
Year-by-year cash flowShow
YearUnits madeBills without solarBills with solarUpkeep and EMIsRunning total
14,637₹36,012₹1,574₹0-₹67,562
24,614₹37,813₹1,737₹0-₹31,486
34,591₹39,704₹1,912₹0₹6,306
44,568₹41,689₹2,100₹0₹45,895
54,545₹43,773₹2,301₹0₹87,367
64,523₹45,962₹2,516₹1,800₹1,29,013
74,500₹48,260₹2,747₹1,800₹1,72,727
84,477₹50,673₹2,994₹1,800₹2,18,606
94,455₹53,207₹3,258₹1,800₹2,66,755
104,433₹55,867₹3,540₹1,800₹3,17,282
114,411₹58,660₹3,842₹1,800₹3,70,300
124,389₹61,593₹4,165₹22,800₹4,04,929
134,367₹64,673₹4,509₹1,800₹4,63,293
144,345₹67,907₹4,877₹1,800₹5,24,523
154,323₹71,302₹5,270₹1,800₹5,88,755
164,301₹74,867₹5,689₹1,800₹6,56,133
174,280₹78,610₹6,136₹1,800₹7,26,808
184,259₹82,541₹6,612₹1,800₹8,00,937
194,237₹86,668₹7,120₹1,800₹8,78,685
204,216₹91,001₹7,661₹1,800₹9,60,225
214,195₹95,552₹8,238₹1,800₹10,45,739
224,174₹1,00,329₹8,852₹1,800₹11,35,416
234,153₹1,05,346₹9,506₹1,800₹12,29,456
244,132₹1,10,613₹10,202₹1,800₹13,28,067
254,112₹1,16,143₹11,157₹1,800₹14,31,254

How the Andhra Pradesh Solar Calculator (APSPDCL) works

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

This page uses the same method as the Solar ROI Calculator India, which explains each term and assumption in full.

Worked example

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

  1. 1Working the bill back through the APSPDCL slabs, charges and duty gives about 366 units a month
  2. 2At 5.5 peak sun hours, 3 kW makes about 386 units a month, 100% of that use
  3. 33 kW at ₹60,000 per kW costs ₹1,80,000; PM Surya Ghar pays ₹78,000, leaving ₹1,02,000
  4. 4The first year saves ₹29,942, and the saving grows as tariffs rise

The system pays for itself in about 3.2 years and leaves the household about ₹12,31,751 ahead over 25 years.

Frequently asked questions

Does this cover APEPDCL and APCPDCL as well?

Yes. APERC sets one domestic tariff for all three Andhra Pradesh DISCOMs: APEPDCL in the north including Visakhapatnam, APCPDCL around Vijayawada and Guntur, and APSPDCL in the south including Tirupati and Nellore.

Where does solar save the most on an AP bill?

Above 225 units a month, where each unit costs ₹8.75, rising to ₹9.75 above 400. The lower bands are cheap, from ₹1.90, so a system sized to wipe out the top bands earns far more per kW than one covering the whole bill.

How does net metering settle on APSPDCL?

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

Sources

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