Soiling & cleaning gaps
Industrial dust, bird droppings, and infrequent cleaning reduce irradiance reaching modules. Losses can reach double digits in heavy-soiling environments.
Impact: 2–26% yield lossAsset Performance
Plant Health Check
Is your rooftop solar plant delivering the returns your board approved? TerraFlux conducts independent health assessments for C&I installations — diagnosing underperformance, quantifying financial impact, and prescribing remedial action.
01
The Problem
Commissioned does not mean performing
Many C&I rooftop plants in India generate below their modelled output within the first three years of operation. The gap rarely shows up as a catastrophic failure — it accumulates quietly through soiling, degradation, shading, inverter issues, and weak O&M governance.
0.75–0.85
Typical Performance Ratio for well-maintained Indian rooftops
<0.70
PR threshold that warrants independent investigation
5–20%
Yield loss from a single undiagnosed issue at plant level
When your EPC contractor or O&M vendor also grades their own work, no one is independently protecting your capital. A Plant Health Check closes that gap.
02
Performance Issues
What drags rooftop plants below benchmark
Field assessments of underperforming C&I rooftops across India consistently surface the same categories of loss. A health assessment isolates which apply to your facility — and what each costs in rupees per year.
Module degradation & defects
PID, microcracks, hotspot formation, and product defects accelerate beyond modelled degradation curves — especially in hot, humid climates.
Impact: 2–20%+ at plant levelShading & layout drift
New structures, HVAC equipment, or vegetation not accounted for in the original design create partial shading that monitoring dashboards often mask.
Impact: 2–20% yield lossInverter & electrical faults
Clipping, thermal derating, loose DC connections, string mismatch, and misconfigured MPPT channels reduce output without triggering obvious alarms.
Impact: Variable; often undetectedMonitoring & baseline errors
Wrong PR baselines, sensor drift, and misconfigured SCADA make a underperforming plant appear healthy on paper.
Impact: Masks real lossesWeak O&M contracts
Missing PR guarantees, undefined reaction times, and no corrective maintenance SLAs allow chronic underperformance to persist year after year.
Impact: Chronic performance drift
03
Assessment Scope
Five dimensions of a Plant Health Check
Every assessment follows a structured engineering framework — from generation data to board-ready financial conclusions.
Capacity & generation analysis
Verify installed DC/AC capacity, establish weather-normalised performance benchmarks, and compare actual generation against your P50 design baseline using Performance Ratio and specific yield analysis.
Financial alignment
Reconcile actual output against the ROI, IRR, and payback assumptions in your original business case. Quantify revenue at risk in ₹/year — not just kWh variance.
Maintenance review
Audit O&M contract scope, cleaning schedules, work order history, spare parts readiness, and SLA compliance against manufacturer recommendations and industry best practice.
Component diagnostics
Identify underperforming equipment through SCADA analytics, infrared thermography, sample IV curve testing, inverter event log review, and targeted site inspection.
Optimisation action plan
Deliver a prioritised remediation roadmap — quick wins, medium-term fixes, and structural improvements — each with estimated kWh recovery, cost, and payback on corrective capex.
04
How It Works
From data request to action plan
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Data intake
We request as-built drawings, commissioning reports, 12–24 months of inverter/SCADA data, utility bills, O&M contracts, and your original financial model.
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Desktop analysis
Engineers normalise generation against irradiance, calculate PR trends, segment losses by inverter and string, and flag financial variance against your approved business case.
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Site inspection
On-site verification with thermography, electrical testing, and physical condition assessment — focused on the highest-impact findings from desktop analysis.
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Health report & roadmap
You receive an independent report with fault register, ₹/year revenue impact, and a prioritised optimisation plan. Remediation execution is available separately through TerraFlux EPC if required.
05
Why TerraFlux
Independent. Engineering-grade. C&I-focused.
Our health assessment mandate is commercially separate from EPC delivery — so findings are unbiased whether TerraFlux built your plant or not. Assessments are led by engineers who work in PVsyst yield modelling, grid interconnection, and C&I tariff structures every day.
- Conflict-free review — not graded by your O&M vendor
- Financial conclusions tied to IRR and payback, not just PR charts
- Structured for facility owners, CFOs, and energy managers
- Remediation available through TerraFlux EPC on a separate contract
Find out what your plant is really delivering
Whether your system is three years old or approaching warranty expiry — a Plant Health Check gives your leadership team the facts to act.
Or email us directly at hello@terraflux.co.in