IS 16221, IS 14286, IS 16170 — Indian Solar Module Standards Decoded

When a solar EPC in India specifies modules for a project — whether 10 kW rooftop or 100 MW ground-mount — three BIS (Bureau of Indian Standards) standards govern whether those modules can legally enter the Indian market and qualify for government-scheme procurement. IS 16221, IS 14286, and IS 16170 are not interchangeable — each covers a different module type, test regime, and application scope. Mixing them up in a BOQ or procurement document is not an academic error: it is a compliance failure that can prevent module import clearance or ALMM registration.

Direct answer. IS 16221 specifies performance and safety requirements for terrestrial photovoltaic modules (crystalline silicon), adopted from IEC 61215 and IEC 61730. IS 14286 covers flat-plate terrestrial photovoltaic modules tested to IEC 61215, with an Indian adaptation for tropical climates. IS 16170 covers concentrator photovoltaic (CPV) modules. For standard crystalline silicon modules (mono/poly PERC, TOPCon, bifacial) used in Indian solar projects, IS 16221 is the primary applicable standard — it is mandatory for BIS certification, ALMM registration, and legal sale of solar modules in India from 2022 onwards.

This guide decodes all three standards, explains what each test evaluates, compares them against the IEC equivalents, and tells you exactly what to check on a module datasheet to verify BIS compliance.

The Regulatory Context — Why BIS Standards Matter

The Bureau of Indian Standards (BIS) administers the Compulsory Registration Order (CRO) for solar photovoltaic modules under the BIS Act 2016. From 2022, all solar modules (crystalline silicon, above 10 Wp) require BIS registration before they can be sold in India. BIS registration requires passing the applicable IS standard test at a NABL-accredited BIS-recognised testing laboratory.

Definition. BIS registration for solar modules is mandatory under the Quality Control Order (QCO) for Solar Photovoltaic Systems, Devices and Components, 2022. A module without a BIS Registration Number (BRN) cannot be legally imported, sold, or procured for any solar project in India — government-scheme or private. The BRN must appear on the module nameplate and in the manufacturer's product certification documentation.

The BIS certification requirement has three direct impacts on EPC procurement:

Import clearance: Indian customs requires BIS registration proof before releasing solar module shipments.
ALMM listing: BIS registration is a prerequisite for ALMM Part I listing. No BIS = no ALMM = no government-scheme procurement.
Legal liability: Installing non-BIS-certified modules exposes the EPC to regulatory penalty and voids the module manufacturer’s warranty in Indian jurisdiction.

IS 16221 — The Primary Standard for Crystalline Silicon Modules

IS 16221 was adopted from the IEC 61215 (Part 1 and Part 2 for crystalline silicon) and IEC 61730 (Module Safety Requirements, Part 1 and Part 2) standards. Published by BIS in 2014 and revised in 2020 to align with the IEC 61215-1:2016 edition, IS 16221 covers:

Performance testing (IEC 61215 equivalent): electrical performance, degradation under UV and thermal cycling, mechanical load testing, hail impact, damp heat, humidity-freeze
Safety testing (IEC 61730 equivalent): module construction requirements, electrical insulation, fire resistance, mechanical integrity, bypass diode thermal runaway

What IS 16221 Tests — The Full Sequence

Test Group	Test Names	What It Evaluates
Electrical	STC power measurement, NOCT measurement, PID resistance	Rated power accuracy, operating temperature, potential-induced degradation
Thermal	Thermal cycling (200 cycles, -40°C to +85°C), damp heat (85°C/85% RH for 1000 hours)	Solder joint fatigue, delamination, moisture ingress
Mechanical	Mechanical load (2400 Pa front + rear), hail (25 mm at 23 m/s)	Structural integrity under wind/snow/hail
UV	UV preconditioning + UV exposure (60 kWh/m²)	Encapsulant and backsheet UV stability
Safety	Insulation resistance, wet leakage current, thermal runaway of bypass diodes	Electrical safety under field conditions
Performance	Output at temperature coefficients, low-irradiance performance	Energy yield prediction accuracy

Field tip. When verifying IS 16221 compliance on a module datasheet, look for the BIS Registration Number (BRN) in the format "R-/" on the label or in the technical specifications section. A BIS certificate number without a BRN indicates the manufacturer has test certification but not BIS product registration — which is not sufficient for Indian procurement.

IS 16221 vs IEC 61215 — Key Differences

IS 16221 is largely harmonised with IEC 61215, but with three Indian-specific adaptations:

Tropical climate test extension: IS 16221 extends the damp-heat test duration from 1000 hours (IEC 61215 standard) to 2000 hours for modules sold in climatic zones with annual average relative humidity above 70%. This affects modules deployed in coastal and humid regions (Kerala, Odisha, West Bengal, Assam).
Local language labelling: IS 16221 requires the module rating plate to include labelling in Hindi in addition to English — a uniquely Indian requirement not in IEC 61215.
BIS-recognised laboratory testing: IS 16221 certification requires testing at a NABL-accredited laboratory that is specifically recognised by BIS for solar testing. A module with IEC 61215 certification from a non-BIS-recognised laboratory must be re-tested at a BIS-recognised lab for Indian certification.

IS 14286 — The Earlier Flat-Plate Module Standard

IS 14286 was published in 1995, with amendments in 2002 and 2010. It covers flat-plate terrestrial photovoltaic modules, primarily adopted from early IEC 61215 editions. IS 14286 is largely superseded by IS 16221 for new module certifications but remains relevant in two contexts:

Legacy module certifications: modules certified to IS 14286 before 2022 may still appear in procurement documents and project equipment lists. Understanding what IS 14286 covers prevents confusion during due diligence.
Thin-film modules: IS 14286 Amendment 3 (2010) extended coverage to thin-film modules (CdTe, CIGS, amorphous silicon) using the IEC 61646 test standard. IS 16221 does not currently cover thin-film modules — they still certify under IS 14286 in India.

Note. For BOQ specification purposes, specify IS 16221:2020 (not IS 14286) as the required standard for crystalline silicon modules in any project after 2022. IS 14286 certification on its own is not accepted by MNRE for new ALMM registrations — the module must have IS 16221 certification.

IS 14286 vs IS 16221 — When Each Applies

Criteria	IS 14286	IS 16221
Module type	Flat-plate (early c-Si, thin-film)	Crystalline silicon (mono, poly, PERC, TOPCon, bifacial)
Publication year	1995 (amended 2010)	2014 (revised 2020)
IEC equivalent	IEC 61215:1993, IEC 61646	IEC 61215:2016, IEC 61730:2016
ALMM acceptance	Legacy only (pre-2022 registrations)	Required for new registrations from 2022
Damp heat requirement	1000 hours (standard IEC)	2000 hours for humid climate zones
Safety standard	Basic IEC 61730:2004	IEC 61730:2016 (enhanced bypass diode, PID)

IS 16170 — Concentrator PV Modules

IS 16170 covers concentrator photovoltaic (CPV) modules and assemblies, adopted from IEC 62108. CPV technology uses optical lenses or mirrors to focus sunlight onto small, high-efficiency multi-junction solar cells. In India, CPV has not achieved significant commercial deployment — the technology is most viable in high direct-normal irradiance (DNI) locations with low diffuse irradiance fraction, which limits its application to arid north-western India.

For practical purposes, IS 16170 is relevant to very few Indian solar projects. If a BOQ or tender document references IS 16170, verify whether the project is actually planning CPV — this is unusual enough that it may indicate an error in the specification document.

IS 16221

Use for 99% of Indian solar projects

Mono/poly/PERC/TOPCon/bifacial c-Si

IS 14286

Legacy and thin-film modules only

CdTe, CIGS, amorphous silicon

IS 16170

CPV modules only

Rare in Indian market — verify before specifying

The BIS Module Certification Decode Framework

The BIS Module Certification Decode Framework is a structured process for verifying that a module specification in a BOQ or procurement document is BIS-compliant and ALMM-eligible. Apply this to every module selection before finalising the BOQ.

Identify Module Technology

Confirm the cell technology: mono c-Si, poly c-Si, PERC, TOPCon, HJT (all require IS 16221). Thin-film (CdTe, CIGS) requires IS 14286. CPV requires IS 16170. This determines which BIS certificate to verify.

Verify BRN on Module Label

The BIS Registration Number (BRN) must appear on the module label and in the manufacturer's documentation. Cross-reference the BRN against the BIS online product registration portal to confirm validity and expiry date. BRNs expire and must be renewed annually.

Check Model-Level Coverage

BIS registration covers specific model numbers, not all products from a manufacturer. Verify that the exact wattage and model number in your BOQ is covered by the BIS certificate. A 540 Wp model and a 545 Wp model from the same manufacturer may have different BRNs.

Confirm ALMM Cross-Reference

Cross-check that the BRN-holding model is listed in the current ALMM Part I. BIS certification and ALMM listing are separate — a module can have BIS certification without being on the ALMM (e.g., it has not filed for ALMM or its factory audit failed).

IEC 61215 and IEC 61730 — The International Roots

IS 16221 is India’s national adoption of IEC 61215 and IEC 61730. For international projects or when cross-referencing test reports from foreign laboratories, understanding the IEC standards is essential:

IEC 61215-1:2021 covers design qualification and type approval for crystalline silicon terrestrial PV modules. The test sequence is the same as IS 16221’s performance testing track. The TÜV SÜD IEC 61215 certification guide explains the test sequence in accessible detail.
IEC 61730-1:2016 / IEC 61730-2:2016 covers module safety qualification. IEC 61730-1 defines construction requirements; IEC 61730-2 defines the test procedures. IS 16221 incorporates both.

The relationship between BIS and IEC certification for Indian procurement:

Certification	Sufficient for legal sale in India?	Sufficient for ALMM?	Required for international projects?
IEC 61215 + IEC 61730 (international lab)	No — must obtain BIS	No	Yes
IS 16221 BIS registration (BIS-recognised lab)	Yes	Yes (if ALMM registration filed)	Not always recognised outside India
Both IEC and IS 16221 BIS	Yes	Yes	Yes (most comprehensive)

Watch out. IEC 61215 certification from an international laboratory (TÜV Rheinland, UL, Bureau Veritas) is not automatically recognised for BIS registration. The module must be tested at a BIS-recognised laboratory — typically CPRI (Central Power Research Institute), NABL-accredited labs such as MNRE-empanelled institutions, or the manufacturer's own BIS-recognised test facility.

What to Write in a BOQ — Standard Specification Language

For a BOQ specifying Indian market crystalline silicon modules, the standard compliance clause should read:

“Solar PV modules shall be crystalline silicon type (mono-PERC/TOPCon/bifacial as specified) meeting IS 16221:2020 (Parts 1 and 2) requirements, with valid BIS product registration (BRN) at the time of procurement. Modules shall additionally be listed in the current ALMM Part I at the time of procurement and dispatch. For DCR-designated projects, modules shall use cells from manufacturers listed in ALMM Part II.”

This specification language protects the EPC against three risks: supplying non-BIS modules (legal risk), supplying BIS-certified but non-ALMM modules (MNRE compliance risk), and supplying non-DCR modules to a DCR tender (contract penalty risk).

Want a BIS-compliant module specification in your BOQ?

Heaven Designs prepares fully compliant BOQs with IS 16221, ALMM, and DCR cross-references verified before submission.

Get the sample pack →

How Heaven Designs Helps

BIS compliance verification and BOQ preparation for Indian solar projects requires tracking multiple standards, registration registers, and monthly-updated lists simultaneously. Most EPC teams miss at least one layer — typically the model-level BIS check or the ALMM cross-reference for specific wattages. Heaven Designs integrates compliance verification into every design deliverable.

Solar Rooftop Detailed Engineering Design — BOQ with IS 16221 compliance column, BRN verification, and ALMM cross-reference.
Engineering Documentation India — full compliance documentation pack: BIS certificates, ALMM certificates, test reports.
Solar Ground Mount Design — utility-scale BOQ with complete module compliance chain documented.
Electrical CEIG Drawings — CEIG-format SLD and layout drawings cross-referencing BIS-certified equipment.
Download a sample deliverable — see a compliant BOQ with BIS and ALMM columns filled.

FAQ

What is IS 16221 and when is it mandatory?

IS 16221 is the Bureau of Indian Standards specification for crystalline silicon terrestrial photovoltaic modules, adopted from IEC 61215 and IEC 61730. It is mandatory for all crystalline silicon solar modules (mono, poly, PERC, TOPCon, HJT, bifacial) above 10 Wp sold in India since 2022 under the BIS Quality Control Order. Without IS 16221 BIS registration, a module cannot be legally imported, sold, or used in any Indian solar project.

What is the difference between IS 16221 and IS 14286?

IS 16221 (2014/2020) is the current standard for crystalline silicon modules, adopted from IEC 61215:2016. IS 14286 (1995/2010) is the earlier standard covering flat-plate modules including thin-film types (CdTe, CIGS). For new crystalline silicon module procurement from 2022 onwards, IS 16221 is required. IS 14286 applies to thin-film modules and legacy modules certified before the IS 16221 requirement was enforced.

How do I verify that a module has valid BIS registration?

Look for the BIS Registration Number (BRN) on the module nameplate, in the format “R-XXXXXXX/YEAR.” Cross-reference this BRN on the BIS online portal at bisapplication.bis.gov.in to confirm validity and the covered model numbers. Also verify that the specific wattage and model number in your BOQ is covered by the BRN — registration is model-specific, not manufacturer-wide.

Can I use a module with IEC 61215 certification but no BIS registration for an Indian project?

No. IEC 61215 certification from an international testing laboratory does not substitute for BIS registration in India. A module must be tested at a BIS-recognised laboratory and registered with BIS to obtain a BRN. Without a BRN, the module cannot be legally imported through Indian customs. A module with international IEC certification must undergo fresh testing at a BIS-recognised facility for Indian market entry.

What is IS 16170 and when would a solar project require it?

IS 16170 covers concentrator photovoltaic (CPV) modules that use optical concentration to focus sunlight on small, high-efficiency multi-junction cells. CPV is rare in the Indian market — the technology requires high direct-normal irradiance (DNI) with low diffuse irradiance, limiting viable locations to parts of Rajasthan and Gujarat. If a BOQ or tender document references IS 16170, verify whether the project truly plans CPV deployment or whether it is a specification error.

Does BIS registration expire and what happens if it lapses?

Yes. BIS product registration (BRN) must be renewed annually. If a BRN lapses, the manufacturer cannot legally sell modules under that registration. For EPCs, this means a module that was BIS-registered when you bid the project may have a lapsed BRN when you procure it. Always verify the BRN renewal date within 30 days of procurement. Modules procured under a lapsed BRN are non-compliant even if they passed the IS 16221 tests.

How does the BIS standard affect module pricing in the Indian market?

BIS certification imposes testing costs (typically $15,000–40,000 per test sequence at a BIS-recognised laboratory) and registration fees on manufacturers. These costs are recovered in module pricing. The Bridge to India 2024 module market report estimates that BIS certification requirements add ₹0.30–0.80/Wp to the landed cost of imported modules, which flows through to EPC project costs. Domestic manufacturers with BIS-recognised in-house labs have a cost advantage in the certification process.