You have three solar quotations in front of you. One offers 10 kW for a price that seems almost too good. Another proposes 8 kW from a brand you recognise, with a longer warranty and a proper site survey included. The third is somewhere in the middle – more panels, vague warranty terms, and a salesperson emphasising system size over actual generation.
This is the decision most Indian solar buyers face today. And increasingly, the smarter ones are not choosing on price or panel count alone.
Why Quantity Alone Is Misleading
More panels do not automatically mean more savings. A rooftop with shading, poor orientation, or structural limitations will not perform better simply because someone packed extra modules onto it. Forcing more panels into a poorly designed layout can actually increase mismatch losses, reducing output below what a smaller, well-designed system would have delivered.
Cheap panels degrade faster – losing a higher percentage of output each year. At year ten, a system built on cut-price modules may be generating 15% to 20% less than projected, while a quality installation holds its performance curve close to original estimates. That gap compounds significantly across a 25-year project life.
Installation quality matters equally. Improper mounting, undersized cabling, incorrect inverter sizing, and poor earthing are invisible at commissioning but show up consistently in underperformance and expensive remediation later.
What Modern Buyers Actually Prioritise
The shift in buyer priorities is visible in the questions now being asked. Customers want to know degradation rates, not just rated wattage. They ask about inverter brand and local service support. They want to understand what the warranty actually covers and whether the company will still be reachable in year seven when something needs attention.
After-sales service has moved from an afterthought to a primary purchase criterion. Site surveys have become a baseline expectation – assessing roof structure, shading patterns, orientation, and load profile before any system is sized or quoted. Buyers are rightly skeptical of quotations generated without one.
Frequently Asked Questions
Does a higher kW system always mean higher savings?
Not necessarily. Sizing must match actual consumption and rooftop conditions. Oversized systems on poorly surveyed rooftops frequently underperform smaller, well-designed ones.
What degradation rate should quality panels maintain?
Reputable manufacturers guarantee no more than 0.5% to 0.7% per year. Lower-grade panels often degrade faster, significantly impacting long-term generation.
How important is inverter brand?
Very. The inverter is the most failure-prone component in most systems. A reliable brand with strong local service directly affects uptime and long-term performance.
What should a proper site survey include?
Roof structure assessment, shading analysis, orientation and tilt evaluation, and a review of your actual electricity consumption pattern.
How do I evaluate warranty terms?
Check what is covered, for how long, and whether the company has a credible local presence to actually honour claims. A 25-year warranty from a company with no service infrastructure is worth very little.
How do I compare quotations fairly?
Compare projected lifetime generation cost per kWh, not just upfront price per watt. Factor in panel quality, inverter brand, warranty terms, and service commitment alongside the number.