Rooftop solar is often marketed with vague promises of "free electricity" and "savings from day one." While both statements are ultimately true over a system's 25-year lifespan, serious investors — whether you are a homeowner in Nellore, a temple-town resident in Tirupati, a farmer in Kadapa, or a coastal property owner in Ongole — deserve precise numbers. What is the actual solar ROI? How many months until your system pays for itself? And how does the PM Surya Ghar subsidy change the equation in 2026?
This guide from ELRIX ENERGY — Nellore's local solar EPC serving all four districts — provides transparent, calculation-backed answers using real 2026 pricing (ELRIX ENERGY tier pricing from ₹67,000 for 1 kW (after discount)), confirmed subsidy tiers, and current APSPDCL tariffs of ₹6–₹8 per unit. Our typical residential customer achieves full payback in 40–55 months. Here is exactly how those numbers work.
What Is Solar ROI and Payback Period?
Return on Investment (ROI) for rooftop solar measures the total financial return your system generates over its operational life relative to your initial investment. It is expressed as a percentage: (Total Lifetime Savings − Initial Cost) ÷ Initial Cost × 100.
Payback period (also called break-even period) is simpler: the number of months or years until cumulative electricity bill savings equal your net upfront cost. After payback, every unit your panels generate is effectively free for the remaining 20+ years of system life.
For a residential solar buyer in Andhra Pradesh, both metrics depend on four variables: (1) net system cost after PM Surya Ghar subsidy, (2) monthly electricity generation in kWh, (3) your APSPDCL tariff rate per unit, and (4) annual tariff escalation. Change any one variable and your payback timeline shifts. ELRIX ENERGY calculates all four during every free consultation using your actual electricity bills — not generic assumptions.
2026 Solar Pricing in Andhra Pradesh: The Starting Point
Before calculating ROI, you need accurate cost baselines. In 2026, a complete Tier-1 EPC installation from ELRIX ENERGY costs ELRIX ENERGY tier pricing from ₹67,000 for 1 kW (after discount) — inclusive of ALMM-listed panels, inverter, cyclone-rated mounting, wiring, labour, and net metering application support.
After PM Surya Ghar Muft Bijli Yojana subsidy, your net investment is:
| System Size | Customer Price | Subsidy | Net Cost |
|---|---|---|---|
| 1 kW | ₹67,000 | ₹30,000 | ₹37,000 |
| 2 kW | ₹1,35,000 | ₹60,000 | ₹75,000 |
| 3 kW | ₹2,00,000 | ₹78,000 | ₹1,22,000 |
| 5 kW | ₹3,34,000 | ₹78,000 | ₹2,56,000 |
| 10 kW | ₹6,66,000 | ₹78,000* | ₹5,88,000 |
*PM Surya Ghar residential subsidy caps at ₹78,000 regardless of system size above 3 kW. For full subsidy details, visit our PM Surya Ghar guide.
These net costs are the denominator in every ROI calculation below. They represent what actually leaves your bank account — making solar in Nellore and Tirupati one of the highest-ROI home improvements available in 2026.
Monthly Generation: What Your Panels Produce in AP
Andhra Pradesh — particularly Nellore, Ongole, and Tirupati — receives 5.0–5.5 peak sun hours daily on average, translating to strong per-kW generation figures:
- 1 kW system: 120–135 units/month (1,440–1,620 units/year)
- 2 kW system: 240–270 units/month
- 3 kW system: 360–405 units/month
- 5 kW system: 600–675 units/month
- 10 kW system: 1,200–1,350 units/month
Coastal Nellore and Ongole benefit from slightly lower ambient temperatures (panels lose efficiency above 25°C), boosting real-world output. Inland Kadapa experiences higher summer temperatures but compensates with fewer cloudy monsoon days from July–September. Tirupati's moderate elevation provides consistent year-round irradiance ideal for predictable ROI modelling.
These generation figures assume proper south-facing (or east-west split) installation, minimal shading, and Tier-1 panels with 21%+ efficiency — standard in every ELRIX ENERGY installation. Underperforming systems from non-empaneled installers using B-grade panels are the primary reason some homeowners report disappointing ROI. Component quality directly determines your payback timeline.
Calculating Monthly Savings at APSPDCL Tariffs
APSPDCL residential tariffs in 2026 range from approximately ₹6 to ₹8 per unit depending on your consumption slab and whether you are on LT-I (domestic) or LT-II (non-domestic) category. For ROI calculations, we use ₹7/unit as the midpoint — conservative for most Nellore and Tirupati households consuming 200–500 units monthly.
Monthly savings = Units Generated × Tariff Rate (adjusted for self-consumption vs export under net metering). In practice, 70–85% of generated units offset direct consumption and the remainder earn export credits at the same tariff — making the calculation straightforward:
- 1 kW: 130 units × ₹7 = ₹910/month → Payback: ₹37,000 ÷ ₹910 = 41 months
- 2 kW: 260 units × ₹7 = ₹1,820/month → Payback: ₹75,000 ÷ ₹1,820 = 41 months
- 3 kW: 390 units × ₹7 = ₹2,730/month → Payback: ₹1,22,000 ÷ ₹2,730 = 45 months
- 5 kW: 650 units × ₹7 = ₹4,550/month → Payback: ₹2,56,000 ÷ ₹4,550 = 56 months
- 10 kW: 1,300 units × ₹7 = ₹9,100/month → Payback: ₹5,88,000 ÷ ₹9,100 = 65 months
All payback periods fall within the 40–65 month range we quote across our service area. The 3 kW system — our most popular size for Kadapa and Nellore homes with 3–4 bedrooms — offers the fastest payback due to the maximum ₹78,000 subsidy relative to system cost.
25-Year Lifetime ROI: The Full Picture
Payback period tells you when the investment breaks even. Lifetime ROI tells you how wealthy the investment makes you. Solar panels carry 25-year performance warranties (typically guaranteeing 80%+ of rated output at Year 25). Inverters are replaced once around Year 12–15 at a cost of ₹15,000–₹25,000 — a minor deduction from total returns.
Using a 3 kW system in Nellore as our reference case (net cost ₹1,22,000, monthly savings ₹2,730 at current tariffs):
- Year 1–4 (payback phase): Cumulative savings ≈ ₹1,22,000+ — investment fully recovered
- Year 4–25 (pure profit phase): 22 years × ₹2,730/month × 12 = ₹7,21,200 in additional savings (at current tariffs, no escalation)
- With 4% annual tariff escalation: Total 25-year savings exceed ₹11,00,000
- 25-year ROI: (₹11,00,000 − ₹1,22,000) ÷ ₹1,22,000 = 802% return
No fixed deposit, mutual fund, or real estate investment in Andhra Pradesh delivers comparable risk-adjusted returns. Solar ROI is backed by a physical asset on your own roof, hedged against electricity tariff inflation, and enhanced by government subsidy that immediately reduces principal.
Factors That Accelerate or Delay Your Payback
While our 40–65 month range holds for most customers, several factors can shift your personal timeline by 6–12 months in either direction:
Accelerators (faster payback):
- High electricity consumption (₹4,000+/month bills) — common in Tirupati homes with multiple AC units
- LT-II commercial tariff rates (₹8–₹10/unit) on home offices or rental units
- Optimal south-facing roof with zero shading
- Choosing 3 kW over 2 kW to maximize the ₹78,000 subsidy cap
- Annual APSPDCL tariff hikes (historically 3–5% per year)
Decelerators (slower payback):
- East/west-facing roofs reducing daily generation by 10–15%
- Partial shading from water tanks, chimneys, or neighbouring buildings
- Hybrid systems with battery backup (adds ₹80,000–₹1,20,000 to net cost)
- Very low consumption (<150 units/month) where a 1 kW system is more appropriate than 3 kW
- Non-empaneled installation without subsidy (adds ₹78,000 to net cost for 3 kW systems)
ELRIX ENERGY's free site survey identifies accelerators and decelerators on your specific roof before you commit — ensuring our ROI projection matches your reality, not a brochure estimate. Book your free assessment to get a personalized payback calculation.
Solar ROI vs Other Investments: An Honest Comparison
Indian homeowners in Kadapa and Ongole often compare solar against fixed deposits (7–7.5% annual return), PPF (7.1%), and equity mutual funds (10–12% historical average with volatility). Here is how ₹1,22,000 (net cost of a 3 kW system) performs over 25 years:
| Investment | 25-Year Value | Risk Level | Tax on Returns |
|---|---|---|---|
| 3 kW Solar (₹1,22,000 net) | ₹11,00,000+ in bill savings | Very Low (physical asset) | None (savings, not income) |
| Fixed Deposit @ 7.5% | ₹4,50,000 approx. | Low | Taxable interest |
| PPF @ 7.1% | ₹4,00,000 approx. | Low | Tax-free but capped |
| Equity Mutual Fund @ 12% | ₹9,50,000 approx. | High (market volatility) | LTCG tax applies |
Solar outperforms fixed income instruments by 2–3× and matches or exceeds equity returns with substantially lower risk. The asset is on your roof, insured under home policy, requires zero active management, and produces returns that automatically increase as electricity tariffs rise. For Nellore homeowners seeking predictable, inflation-hedged returns, rooftop solar is the strongest investment available in 2026.
Commercial Solar ROI: Accelerated Returns for Businesses
Commercial and industrial solar installations in Nellore's industrial belt and Kadapa's processing zones achieve even faster payback than residential systems due to three additional financial levers:
1. Higher tariff rates: HT commercial consumers pay ₹8–₹12 per unit — 40–70% more than residential rates. Every generated unit saves more money, compressing payback to 24–36 months for well-sized systems.
2. Accelerated Depreciation (Section 32): Businesses claim 40% depreciation on the solar asset in Year 1, reducing taxable income. On a ₹10 lakh commercial installation, this provides ₹40,000+ in tax savings (at 30% corporate tax rate) in the very first year — effectively subsidizing the investment beyond PM Surya Ghar.
3. Demand charge reduction: HT consumers pay demand charges based on peak kW draw. Solar reduces peak grid demand during daylight hours, lowering both energy and demand components of the bill.
ELRIX ENERGY's commercial solar division provides detailed ROI models including depreciation benefits, demand charge analysis, and 25-year cash flow projections for factories, hotels, hospitals, and retail chains across Andhra Pradesh.
How PM Surya Ghar Subsidy Transforms ROI
Without PM Surya Ghar subsidy, a 3 kW system's net cost would be ₹2,00,000 instead of ₹1,22,000 — extending the payback period to approximately 73 months. The subsidy is the single largest ROI accelerator available to residential consumers in 2026.
Subsidy tiers are fixed nationally: ₹30,000 for 1 kW, ₹60,000 for 2 kW, and ₹78,000 maximum for 3 kW and above. This creates a sweet spot at 3 kW where you receive the highest subsidy-to-investment ratio (45% of customer price recovered via subsidy on a 1 kW system vs 39% on a 3 kW system — but absolute subsidy amount peaks at 3 kW).
Critical requirement: only empaneled vendors like ELRIX ENERGY can facilitate PM Surya Ghar subsidy disbursement. The ₹78,000 is credited directly to your bank account after installation and DISCOM inspection — you never need to pay the full customer price upfront and wait for reimbursement manually. We deduct the subsidy from your invoice, so your out-of-pocket cost equals the net figures in our pricing table from day one.
Real Customer ROI Scenarios from ELRIX ENERGY
Scenario 1 — Nellore residential (3 kW): Mr. Rao, Trunk Road, monthly bill ₹3,800 (520 units). Post-solar bill: ₹600–₹900. Monthly saving: ₹2,900. Net cost: ₹1,22,000. Payback: 42 months. Projected 25-year savings: ₹9.8 lakh.
Scenario 2 — Tirupati home with AC (5 kW): Family near Alipiri, monthly bill ₹6,200 (780 units). Post-solar bill: ₹1,200. Monthly saving: ₹5,000. Net cost: ₹2,56,000. Payback: 41 months. Projected 25-year savings: ₹18 lakh.
Scenario 3 — Kadapa farmhouse (2 kW): Agricultural property, monthly bill ₹1,600 (230 units). Post-solar bill: ₹200. Monthly saving: ₹1,400. Net cost: ₹75,000. Payback: 50 months (lower consumption, but still strong lifetime ROI).
Scenario 4 — Ongole commercial (10 kW): Textile showroom, monthly bill ₹22,000. Post-solar bill: ₹8,000. Monthly saving: ₹14,000. Net cost: ₹5,88,000 (after ₹78,000 subsidy). Payback: 30 months with accelerated depreciation tax benefit. Projected 25-year savings: ₹42 lakh.
These are actual client profiles (names changed) from ELRIX ENERGY installations completed in 2024–2025, tracked through our post-installation monitoring program. Learn more about our track record across Andhra Pradesh.
Planning Your Solar Investment Timeline
Smart investors in Nellore, Tirupati, Kadapa, and Ongole treat solar ROI as a phased financial journey rather than a single purchase event. During the payback phase (Months 1–48), your monthly APSPDCL bill savings progressively recover your net investment of ₹37,000 to ₹5.88 lakh depending on system size. Once cumulative savings exceed net cost, you enter the profit phase where every generated unit represents pure financial gain. We recommend scheduling your free ROI consultation before the summer peak billing season (March–June), when APSPDCL consumption is highest and the financial case for solar is most visible on your electricity bill. Early installation also maximizes generation during Andhra Pradesh's sunniest months, accelerating your path to break-even.
Frequently Asked Questions
What is the average solar payback period in Andhra Pradesh in 2026?
Most residential systems achieve payback in 40–55 months. A 3 kW system — the most popular size — typically pays back in 40–50 months at current APSPDCL tariffs of ₹6–₹8 per unit and net cost of ₹1,22,000 after subsidy.
How do you calculate solar ROI?
ROI = (Total Lifetime Savings − Net Investment) ÷ Net Investment × 100. For a 3 kW system: (₹11,00,000 − ₹1,22,000) ÷ ₹1,22,000 ≈ 1,096% over 25 years. ELRIX ENERGY provides personalized ROI calculations during free consultations.
Does PM Surya Ghar subsidy affect payback period?
Dramatically. The ₹78,000 subsidy on 3 kW+ systems roughly halves your net investment, cutting payback from 73+ months to 40–50 months. Apply through an empaneled vendor — see our subsidy page.
Which system size offers the best ROI in Nellore?
3 kW offers the optimal balance: maximum ₹78,000 subsidy, sufficient for most 3–4 BHK homes, and fastest payback at 40–50 months. Homes with bills above ₹5,000/month should consider 5 kW (net cost ₹2.56 lakh, payback ~56 months).
Do solar panels degrade and reduce ROI over time?
Tier-1 panels degrade approximately 0.5% per year — producing 87–90% of original output at Year 25. This is factored into warranty guarantees. Even with degradation, 25-year ROI exceeds 800% for most AP installations.
Is solar ROI better than a fixed deposit?
Significantly. A ₹1,22,000 fixed deposit at 7.5% yields approximately ₹4.5 lakh over 25 years. The same investment in a 3 kW solar system saves ₹11+ lakh in electricity bills — 2.4× better with zero market risk.
How does tariff escalation improve solar ROI?
APSPDCL tariffs have risen 3–5% annually over the past decade. Your solar generation cost is fixed at zero after payback, so savings grow every year the grid rate increases — a built-in inflation hedge no FD can match.
What is the ROI for commercial solar in Kadapa?
Commercial systems benefit from higher HT tariffs (₹8–₹12/unit), 40% accelerated depreciation in Year 1, and demand charge reduction. Typical commercial payback: 24–36 months. Contact our commercial team for a facility-specific model.
Does net metering affect ROI calculations?
Yes — net metering ensures you receive full retail tariff credit (₹6–₹8/unit) for exported units, maximizing monthly savings. Without net metering, half your generation could be wasted, doubling payback time.
Can I finance solar and still achieve positive ROI?
Yes. If monthly EMI is less than monthly bill savings — which it typically is for 3 kW+ systems — you are cash-flow positive from Month 1. ELRIX ENERGY partners with NBFCs offering solar-specific loan products across AP.
How accurate are ELRIX ENERGY's ROI projections?
We base projections on your actual 12-month APSPDCL bills, site-specific generation modelling, and current tariff slabs. Our tracked installations confirm projections within ±10% — request your personalized ROI report.
What happens to ROI if I sell my home?
Solar increases property resale value by 3–4% nationally. In Nellore and Tirupati's growing real estate market, a paid-off solar system is a major selling point — buyers inherit 15+ years of free electricity.
