What's inside this checklist guide
01 Why quality matters in B2B solar procurement02 Checklist 1 — ALMM & regulatory compliance03 Checklist 2 — Technical specifications04 Checklist 3 — Physical & visual inspection05 Checklist 4 — Performance & efficiency06 Checklist 5 — Warranty & after-sales07 Checklist 6 — Vendor evaluation08 Checklist 7 — Delivery & logistics09 Checklist 8 — Pre-shipment inspection10 Mono-PERC vs Bifacial11 Red flags12 FAQSECTION 01
Why Quality Matters in B2B Solar Procurement In India's B2B solar market, a wrong procurement decision costs far more than the price difference between a good and a mediocre panel.
Procurement decisions in solar are often made under extreme time pressure.
This checklist eliminates those shortcuts for India's government tender environment in 2025 .
"A solar panel that costs Rs.1/Wp less but degrades 0.1% faster annually costs more over 25 years."
— HeadsUp B2B Solar Research, 2025 ₹1.8 Cr
Revenue loss per year
From 2% underperformance on 100 MW RESCO
0.45%
Acceptable annual degradation
Industry standard for Mono-PERC
47
Checklist items
Covering compliance, specs, quality, performance
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SECTION 02
Checklist 1 — ALMM & Regulatory Compliance This is the most critical checklist. Every item here is a binary pass/fail .
⚠
Zero-tolerance zone: ALMM non-compliance = contract termination EPC contractors who install non-ALMM panels face contract termination.
ALMM & Regulatory Compliance Mandatory — All Items ✓
ALMM Part-I Listing VerifiedALMM
Specific model AND watt-peak variant must be on current MNRE ALMM list.
✓
IEC 61215 Certificate ValidIEC
Design qualification for crystalline silicon PV modules.
✓
IEC 61730 Certificate ValidIEC
Safety qualification — Part 1 + Part 2.
✓
BIS CRS Registration CurrentBIS
Bureau of Indian Standards Compulsory Registration.
✓
Domestic Manufacturing ConfirmedMNRE
For DCR projects, panel must be manufactured in India.
✓
Model Matches Tender Specification Exactly
Model number, watt-peak, cell technology must match.
!
ALMM Listing Valid for Full Project Duration
ALMM is updated quarterly.
SECTION 03
Checklist 2 — Technical Specifications India's government solar tenders have converged on consistent technical specifications in 2024-25.
Technology
Mono-PERC crystalline silicon
Watt-Peak Range
550–575 Wp
Cell Configuration
144 half-cut cells
Module Efficiency
Minimum 21.0% at STC
Temperature Coefficient
Maximum −0.35%/°C
Operating Temp
−40°C to +85°C
Frame Material
Anodised aluminium alloy
Glass Type
3.2mm tempered low-iron
Backsheet
White PVF/PVDF composite
Wind / Snow Load
Minimum 2400 Pa
Technical Specification Checklist Critical — Reject on Failure ✓
Wattage within specified range (550–575 Wp)
Verify STC rating.
✓
Module efficiency ≥ 21.0% at STC
Higher efficiency = fewer panels.
✓
Temperature coefficient (Pmax) ≤ -0.35%/°C
Critical for Gujarat/Rajasthan climate.
✓
Connector compatibility confirmed
MC4 must match site BOS.
!
Power sorting/binning tolerance ≤ ±2.5 Wp
Loose binning causes string mismatch.
SECTION 04
Checklist 3 — Physical & Visual Inspection Physical inspection is the last line of defence before installation.
💡
Always request EL imaging for orders above 500 panels EL imaging reveals invisible micro-cracks and soldering defects.
Physical & Visual Inspection Checklist Critical — Inspect Every Pallet ✓
No visible cracks in glass
Use torch at 45° angle.
✓
No cell cracks visible through glass
Cracked cells cause hot spots.
✓
No delamination or yellowing
Creates moisture ingress paths.
✓
Frame welds intact
Structural failure point under wind load.
✓
Junction box sealed
Must be IP68 sealed.
✓
Cable connectors undamaged
Check + and − markings.
✓
Serial number and model label intact
Required for warranty claims.
!
Backsheet undamaged
Last barrier against rear moisture.
!
Packaging intact
Photograph damaged packaging.
SECTION 05
Checklist 4 — Performance & Efficiency Performance cannot be verified by inspection alone.
Performance & Efficiency Checklist Important — Sample Test ✓
Factory flash test report verified
Request I-V curve report for each batch.
✓
On-site spot flash test on 10% sample
For orders above 1,000 panels.
✓
Performance ratio (PR) baseline established
Within 30 days of commissioning.
!
EL imaging on minimum 5% of lot
Reveals micro-cracks.
SECTION 06
Checklist 5 — Warranty & After-Sales For 25-year projects, warranty terms are as important as price.
Warranty & After-Sales Checklist Important — Verify Documentation ✓
Product warranty minimum 12 years
30 years preferred for RESCO projects.
✓
Performance warranty — 25 years linear, 80% at end
Max 0.45%/year degradation.
✓
Warranty registered in India
Indian law governing.
✓
Response time in writing
Max 30 days for replacement.
!
Manufacturer financial stability checked
Review audited financials.
SECTION 07
Checklist 6 — Vendor Evaluation Conduct structured vendor evaluation before first order.
Vendor Evaluation Checklist Important — Complete Before First Order ✓
Manufacturing capacity ≥ 2× annual order
Ask for MNRE-reported capacity.
✓
Factory location verified
Must match ALMM listing address.
✓
Delivery track record to remote sites
Ask for 3 references.
✓
Government project track record
Verify 3 completed projects.
✓
Payment terms per market norms
20–30% advance is standard.
!
Sample panel tested before bulk order
Always request a sample.
SECTION 08
Checklist 7 — Delivery & Logistics Delivery to remote sites is where many procurement processes break down.
Delivery & Logistics Checklist Important — Confirm Before Order ✓
Committed delivery date in PO
Specific calendar date.
✓
Packaging standards for summer transport
Moisture-resistant packaging.
✓
Insurance coverage confirmed
All-risk transit insurance.
✓
Delivery phasing aligned
Phased delivery for 5 MW+.
!
Penalty clause for late delivery
Mirror LD clause.
SECTION 09
Checklist 8 — Pre-Shipment Inspection PSI is the most cost-effective quality intervention.
Pre-Shipment Inspection Checklist Recommended — Orders Above 500 Panels i
Engage third-party agency (SGS, Bureau Veritas, TÜV)
Use recognised agency for orders above Rs.50 L.
i
AQL sampling plan agreed
AQL level II, 1.0.
i
EL imaging on 5% sample minimum
Reveals defects.
i
Flash test at factory confirmed
Witness live tests.
i
ALMM and certification docs verified
Original documents only.
i
Packing inspection before loading
Sealed cartons with stickers.
SECTION 10
Mono-PERC vs Bifacial: Which to Procure in 2025? The most common specification question in 2025.
Criteria Mono-PERC (Standard) Bifacial Mono-PERC B2B Verdict ALMM availability Very high Growing Mono-PERC wins Govt tender compliance 100% Compliant where specified Mono-PERC wins Price Rs.18–22/Wp Rs.22–28/Wp Mono-PERC wins Efficiency 21.0–22.5% 22.0–23.5% Bifacial slight edge Energy yield Baseline +8–15% Bifacial wins Hot climate Good Marginally better Bifacial slight edge PM-KUSUM A Universal Project-specific Mono-PERC wins EPC preference Universal Large utility only Mono-PERC wins
✓
B2B recommendation for 2025: Mono-PERC 550–575 Wp for all government projects Right specification for PM-KUSUM, Nagarpalika rooftop, and PSU projects.
SECTION 11
Red Flags: When to Reject a Solar Panel Supplier Signals that should trigger supplier rejection.
✗
Immediate rejection: ALMM cannot be independently verified Verify ALMM directly at mnre.gov.in.
Red Flag Why It Matters Action Price below Rs.14/Wp Indicates non-ALMM or false wattage Reject Cannot provide original IEC certificates Certificate fraud is documented in industry Reject Refuses third-party inspection Legitimate manufacturers welcome inspection Reject Factory address differs from ALMM listing Possible contract manufacturing Reject 100% advance payment required Market norm is 20–30% Negotiate Cannot provide EL imaging Any modern factory has EL testing Audit first No remote delivery track record Logistics to remote sites is a challenge Pilot order only Verbal warranty only Unenforceable Reject
SECTION 12
FAQ — B2B Solar Procurement Questions Most common questions from procurement managers.
What certifications are mandatory for solar panels in Indian government projects?+
What is the standard solar panel specification for government tenders in India 2025?+
How do I verify ALMM listing for a specific solar panel model?+
What is an acceptable annual degradation rate for Mono-PERC panels in India?+
Should I choose Mono-PERC or Bifacial panels for PM-KUSUM projects?+
What price should I expect to pay for ALMM-listed Mono-PERC 550–575 Wp panels in 2025?+
How many panels should I flash-test on goods receipt?+
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Published April 2025 · HeadsUp B2B Solar Research 
