BIS Certification for Solar & Storage Batteries

This is the question we get most often from manufacturers and importers entering the Indian solar market, so we are answering it right at the top. The short answer: yes, in Indian regulatory language they refer to the same product. Here is the full explanation, because understanding this distinction (or the absence of it) directly affects which standard you certify under and how you approach the BIS process.

The practical takeaway: whether your product is labelled "solar PV battery," "solar storage battery," "PV energy storage" or "solar battery bank" - if it is a rechargeable battery designed for use with a solar photovoltaic system, it falls under IS 16270:2023 and needs BIS CRS registration under the MNRE Solar Systems Order, 2025. The terms are different labels for the same product in the same legal bucket.

Solar storage batteries in India live at the intersection of two Indian Standards. Understanding both - and how they interact - is essential before you approach any BIS-recognised laboratory or file any application.

Standard 1: IS 16270:2023 - The Primary Solar Battery Standard

IS 16270:2023 is titled Secondary Cells and Batteries for Solar Photovoltaic Applications - General Requirements and Methods of Test. It is the updated version of IS 16270:2014, revised to reflect modern battery chemistries including lithium, and published under the MNRE Solar Systems, Devices and Components Goods Order, 2025.

Standard 2: IS 16046 (Part 2):2018 - For Lithium-Ion Solar Batteries

IS 16046 (Part 2):2018 is the Indian Standard for Secondary Lithium Cells and Batteries for Portable Applications - Safety Requirements, aligned with IEC 62133-2:2017. It applies to lithium-ion and lithium-polymer batteries specifically and covers a rigorous set of electrical, mechanical and thermal abuse tests that IS 16270 alone does not fully replicate.

IS 16270:2023 covers secondary cells and batteries for solar photovoltaic applications. Here is every product category that falls within scope - and some that do not:

India's solar energy capacity has crossed 90 GW and is expanding at a pace matched by few countries. Behind every rooftop panel and every solar farm is an energy storage system whose quality and safety is invisible to the end user - until it fails. When it fails, the consequences are severe: fires in residential installations, thermal runaway events in commercial BESS, and in rural off-grid settings, electrocution and fire hazards in homes that have no other power source.

The government's response was the Solar Systems, Devices and Components Goods Order - first issued in 2017, significantly upgraded with the 2025 order that brought IS 16270:2023 into mandatory enforcement. MNRE made the standard compulsory for exactly the reasons that matter in India's market reality: the country imports enormous volumes of batteries from manufacturers whose quality can only be verified through independent testing, not country-of-origin declarations or international certifications that do not map to Indian standards.

For manufacturers and importers, the answer to "why mandatory" is also entirely practical: customs authorities at Indian ports and ICDs verify BIS CRS registration numbers against the BIS database as a condition of clearance. Products without a valid R-number are detained. The daily demurrage on a held shipment of solar batteries for a commercial project runs into lakhs within days.

• Legal market access: manufacture, import, stock and sell solar storage batteries in India without customs detention, seizure or port holds. With a valid R-number, your product clears customs - without it, every shipment is a risk.
• MNRE scheme and government tender eligibility: PM-KUSUM, RDSS, ALMM (Alternative List of Modules and Manufacturers) and most government solar procurement programmes require BIS-certified storage batteries as a supplier qualification condition. BIS certification is the entry ticket to this enormous institutional market.
• Project developer and EPC contractor approval: EPCs and solar project developers now vet battery suppliers against BIS registration as a baseline qualification. The R-number is the first line on the vendor approval checklist.
• Consumer and institutional trust: the Standard Mark is the visible compliance signal that differentiates certified product from the uncertified grey-market alternatives flooding the distributed solar segment.
• E-commerce and platform listings: solar battery listings on major Indian e-commerce platforms are subject to BIS registration checks. Uncertified products get delisted.
• Competitive pre-positioning: as India's storage market scales toward MNRE's 2030 targets, regulatory enforcement will only tighten. Being already certified positions you ahead of competitors who wait and then queue. The lab queues at certification time are where your market-entry timeline is lost.
• BWMR 2022 EPR compliance: alongside BIS certification, all solar battery producers, importers and brand owners must register under the Battery Waste Management Rules, 2022 (CPCB EPR). We handle both tracks together so both land at the same time.

Documentation falls into four groups. Preparing them correctly from the start - not in the format you already have, but in exact BIS format - is where experienced consultants save weeks over first-time self-filers:

Company and Administrative Documents

• Company registration certificate (CIN for Indian companies, equivalent for foreign companies)
• GST registration certificate (Indian manufacturers and importers)
• Import Export Code (IEC)
• ISO 9001:2015 Quality Management System certificate - mandatory for solar battery CRS applications
• Authorised signatory details and board resolution or authorisation letter
• AIR appointment documents - Authorisation Letter (notarised and apostilled where required) + AIR company registration proof (for foreign manufacturers)

Product Technical Documents

• Product name, model number and complete model list
• CCL (Cell Compliance List) - for lithium batteries: chemistry, cell manufacturer, cell model, capacity, voltage parameters, BMS details
• CDF (Cell Data Form) - technical data for each cell including manufacturer test data on capacity, safety characteristics and performance
• Battery pack circuit diagram and BMS (Battery Management System) block diagram - with all protection functions documented (overcharge, overdischarge, overcurrent, overtemperature)
• Technical specification sheet (capacity in Ah and Wh, voltage parameters, cycle life, operating temperature range, dimensions, weight)
• Product user manual (English version)
• Product photographs from multiple angles
• Safety marking and label design showing Standard Mark, R-number, capacity, voltage, safety warnings

Laboratory Test Reports

• Complete test report from a BIS-recognised NABL-accredited laboratory covering all IS 16270:2023 parameters (including Amendment No. 1 requirements)
• For lithium chemistry: separate test report covering IS 16046 (Part 2):2018 parameters
• For lithium chemistry from February 2026: capacity verification per IS 16047 (Part 3):2018 Clause 7.3.1 included in the Unified Test Report
• All test reports must be current and cover the exact product model being registered

Compliance Declarations

• Declaration of Conformity to IS 16270:2023 (and IS 16046 where applicable) signed by the authorised signatory
• Declaration of intent to comply with Amendment No. 1 requirements (for applications filed during the transition period)

The BIS CRS registration for solar storage batteries is typically granted for 2 years and renewable for periods of up to 5 years. Under the BIS (Conformity Assessment) Amendment Regulations, 2026 (notified 25 February 2026), licences and renewals can now run for up to 5 years, with fees payable annually in advance along with a production statement.

Critical during validity - cell supplier and specification changes: if the battery cell model, cell supplier, BMS specification, chemistry or capacity changes after registration, the existing R-number may no longer cover the modified product. Fresh testing and a new application may be required. For solar battery suppliers whose Chinese cell suppliers change mid-production without notification, this is a real and recurring compliance risk. We build monitoring into our post-registration service so clients are alerted before a specification drift becomes a customs problem.

The February 2026 rated capacity mandate (for lithium): by MeitY's order dated 3 February 2026, rated capacity verification per Clause 7.3.1 of IS 16047 (Part 3):2018 is now mandatory for lithium cells and batteries under IS 16046 (Part 2). For existing registrations, the deadline is 30 April 2027. After that date, no new registration is granted for lithium batteries without rated-capacity testing in the Unified Test Report. For solar battery manufacturers with lithium chemistry, this is a live 2026-27 compliance project that runs alongside your IS 16270 registration.

Based on Standphill India's direct experience managing IS 16270 certifications, these are the mistakes that cost manufacturers the most time and money:

• Filing under IS 16270:2014 after July 2025. New licences under the old standard are not accepted. Applications filed under 2014 after the cutoff are rejected and must be refiled from scratch under IS 16270:2023 with Amendment No. 1-compliant test reports.
• Not testing to Amendment No. 1 requirements. If your lab ran IS 16270:2023 tests before the amendment was incorporated into the lab's test scope, your report may not cover the new lithium discharge-at-0.2-It requirement or the expanded cell-testing scope. The BIS application will be rejected on scrutiny.
• Assuming IS 16046 is optional for lithium solar batteries. Manufacturers who file only IS 16270:2023 for their lithium-chemistry solar battery and skip IS 16046 (Part 2) typically receive a BIS query requiring IS 16046 data. The result: re-testing and re-filing. We map the exact requirement before any sample ships.
• Missing ISO 9001:2015. Applications for solar battery CRS registration require a valid ISO 9001:2015 certificate. Manufacturers who do not hold it must obtain it first - or simultaneously - adding weeks to the timeline. We flag this at the first call.
• IATA DG non-compliance for lithium samples. Lithium battery samples shipped internationally for testing must comply with IATA Dangerous Goods Regulations. Airlines and customs reject improperly packaged samples; the delay while reshipment is organised can cost 2-3 weeks off a timeline that is already tight. We provide detailed shipping guidance before any sample is packed.
• Not updating existing IS 16270:2014 registrations. Existing licensees who have not transitioned to IS 16270:2023 face potential licence cancellation. If you hold an old IS 16270:2014 BIS licence, this is your most urgent compliance task right now.

BIS CRS is the product compliance. But solar battery producers, importers and brand owners also carry a second mandatory obligation: Extended Producer Responsibility (EPR) under the Battery Waste Management Rules, 2022 (BWMR), administered by CPCB under the Ministry of Environment. EPR registration on the CPCB portal, year-wise collection and recycling targets, and periodic returns are all mandatory for every entity placing batteries on the Indian market - regardless of chemistry, application or scale.

We handle BWMR EPR registration in parallel with BIS CRS certification so both compliance tracks close together. Your procurement and project-development buyers increasingly ask for both - BIS for product compliance, BWMR for circular economy compliance.

With 20+ years and 10,000+ certifications we bring four specific capabilities to solar battery certification that generalist portals cannot:

• Standard currency: we tracked IS 16270:2023, its Amendment No. 1, the February 2026 lithium capacity mandate and the MNRE 2025 order as they were notified. Our clients were briefed and acted; nobody discovered these changes at the lab or at customs.
• Multi-standard co-filing: for lithium solar batteries we file IS 16270:2023 and IS 16046 (Part 2):2018 as one coordinated project, with one set of sample logistics and one documentation timeline - not two sequential filing cycles.
• IATA DG logistics expertise: lithium battery sample shipping is the most common cause of timeline blowouts on international CRS applications. We have done this hundreds of times and provide exact, carrier-compliant packing instructions before anything is boxed.
• AIR with substance: we act as Authorized Indian Representative for solar battery manufacturers from China (the Jiangsu/Guangdong cell cluster), South Korea, USA, Germany and beyond - as a genuine compliance partner that BIS knows and works with, not a nameplate arrangement.