Most solar quotes give you a single number. That number hides the real story: what the components actually cost, where installers earn their margin, which costs you can negotiate, and — most importantly — what solar electricity actually costs you per unit over 25 years.

Component-by-Component Cost Breakdown (5 kW System, Rajasthan, 2025)

What Module Prices Tell You About the Market

Solar module prices have fallen 92% since 2010 — from roughly $1.80/Wp to $0.12-0.15/Wp (₹10-13/Wp at current rates) for imported polycrystalline, or ₹22-28/Wp for BIS-certified domestic Tier-1 PERC panels. This is the single biggest driver of solar economics over the past decade.

Why are domestic panels more expensive than imported? BIS (Bureau of Indian Standards) certification is mandatory for PM Surya Ghar subsidy eligibility, and domestic manufacturers price at a premium to the now-tariffed import market. For subsidy-eligible residential installations, this price is not negotiable — you must use BIS-certified panels. For commercial/industrial installations without subsidy requirements, imported panels at ₹12-18/Wp are an option, though you sacrifice warranty serviceability in India.

The Hidden Costs Most Quotes Ignore

A responsible solar quote should include — but often omits — the following:

• Annual Maintenance Contract (AMC): ₹3,000-8,000/year — covers bi-annual cleaning, inverter health check, connection torque check. Without an AMC, most homeowners clean irregularly and see 10-20% lower lifetime yield.
• Inverter replacement at Year 10-12: ₹25,000-50,000 — string inverter warranties are typically 5-10 years; budget for one replacement over a 25-year system life.
• Cleaning equipment: ₹2,000-5,000 — a long-handled soft brush and water feed. Rajasthan dust makes this non-optional.
• Structural assessment (for old roofs): ₹5,000-20,000 — if your terrace is pre-2000 construction, a structural engineer certificate is needed for DISCOM approval.

The Number That Actually Matters: Levelised Cost of Energy (LCoE)

Forget the upfront price. The question that matters is: what does each unit of electricity from this solar system actually cost you over its lifetime?

At ₹2.09/unit from solar versus ₹8/unit from the grid, you are generating electricity at 74% less than grid cost — and that gap widens every year as tariffs increase (historical average: 6% annual DISCOM tariff hike in Rajasthan).

The 25-Year Savings Picture

Assuming a starting grid tariff of ₹8/unit and a conservative 5% annual tariff escalation:

• Year 1 savings: ₹60,000 (7,500 units × ₹8)
• Year 10 savings: ₹90,000+ (tariff escalation effect)
• Year 25 savings: ₹1.8L+ (compounded tariff growth)
• 25-year gross savings: ₹16-20L
• Less total costs (₹3.6L): net profit ₹12-16L

This is why solar ROI in Rajasthan is among the best in India — the combination of high irradiance, rising DISCOM tariffs, and the PM Surya Ghar subsidy creates an investment that most fixed-income instruments cannot match on a risk-adjusted basis.

How to Evaluate a Quote

When you receive a solar quote, ask for a line-item breakdown. Red flags include: no specification of panel brand and model, no mention of inverter warranty terms, no inclusion of net metering application cost, and no provision for panel cleaning. A quality EPC like FGPS Solar will provide a detailed Bill of Quantities (BoQ) alongside the quote.

The cheapest quote is rarely the best investment. A ₹30,000 saving on installation can cost ₹2-3L in lost generation over 25 years if it means inferior panels or an undersized mounting structure.