How is RoHS testing conducted for PV energy storage components? It involves two key steps: first, using XRF for rapid preliminary screening of total elemental content; second, performing chemical pretreatment followed by quantitative confirmation via ICP or GC-MS for samples that exceed limits or fall within critical ranges.
Testing follows the IEC 62321 series; for exports to the EU, “RoHS 10” compliance (the original 6 substances plus 4 phthalates) is mandatory. XRF serves only as a preliminary screen, whereas chemical analysis reports are the ones accepted for EU customs clearance.
I. What is RoHS?
Regulated Substances and Limits
- RoHS = EU Directive on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (2011/65/EU [RoHS 2.0] + Amendment (EU) 2015/863 [RoHS 3.0, adding 4 phthalates]). It is a fundamental market access requirement for the EU (Source: EU/SGS/CTI).
- 10 Regulated Substances: Limits for Lead (Pb), Mercury (Hg), Hexavalent Chromium (Cr(VI)), PBBs, PBDEs, DEHP, BBP, DBP, and DIBP are ≤0.1% (1000 ppm);
the limit for Cadmium (Cd) is ≤0.01% (100 ppm) (Source: SGS/CTI). - Assessment Target = Homogeneous materials (materials that cannot be mechanically separated): A compliant finished product does not guarantee that every plastic part, solder joint, or coating is compliant;
components must be broken down into homogeneous materials for assessment (Source: Shitong/Huayu). - Two Proposed Additions: Tetrabromobisphenol A (TBBP-A) and Medium-Chain Chlorinated Paraffins (MCCPs) are currently under proposal, with a recommended limit of 0.1%;
stay updated on the latest developments (Source: CTI).
II.
Testing Methods: XRF Screening + Chemical Confirmation
- Step 1: XRF Screening (IEC 62321-3-1:2026): X-ray fluorescence spectroscopy; non-destructive; single-point analysis taking 10–120 seconds; measures total elemental content of Pb, Hg, Cd, total Cr, and total Br; suitable for incoming batch inspection, production line spot checks, and finished product sampling (Source: Huak/Shitong).
- XRF Limitations: Measures only total elemental content;
cannot distinguish between Hexavalent Chromium (Cr(VI)) and Trivalent Chromium (Cr(III)); cannot differentiate PBB/PBDE from other brominated compounds; cannot detect the 4 regulated phthalates; shallow penetration depth (scans surface only);
poor accuracy when cadmium levels are near the threshold (Source: Huak/Silvereye). - Step 2: Chemical Pre-treatment (IEC 62321-2): Disassemble into homogeneous materials → grind/pulverize → microwave digestion or Soxhlet extraction followed by rotary evaporation concentration;
operations must be performed in a fume hood with appropriate protective measures (Source: Shitong). - Instrumental Quantitative Analysis: ICP-OES/ICP-MS for Pb, Hg, and Cd (IEC 62321-4/5); UV-Vis spectrophotometry for Cr(VI) (62321-7);
GC-MS for PBB, PBDE, and phthalates (62321-6/8) (Source: CTI/Huak). - Service Package Distinctions: RoHS 6 (6 items: metals + halogens); RoHS 10 (6 items + 4 phthalates; mandatory for EU export); RoHS 4 (phthalates only, as a supplementary test); RoHS 10 is essential for exports to the EU (Source: Silvereye).
III. Applicability and Risk Areas for PV and Energy Storage Components
- Applicable Products: Electronic and electrical equipment with a maximum operating voltage of ≤1000V AC / ≤1500V DC—PV modules (junction boxes, cables, backsheets, connectors), inverters/PCS, energy storage batteries/systems/BMS, and controllers all fall within the scope of RoHS (Source: CTI/Huak).
- High-Risk Area 1 (Solder & Metals): Lead in solder (lead-added soldering is the most common source of non-compliance);
hexavalent chromium in anti-corrosion coatings/platings (Source: UL/Shitong). - High-Risk Area 2 (Plastic Housings & Flame Retardants): ABS/PC housings, power supply casings, and cable insulation layers often contain PBB/PBDE brominated flame retardants (Source: Huak).
- High-Risk Area 3 (Soft Materials & Cables): PVC cables, silicone/soft rubber, gaskets, artificial leather, printing inks, and adhesives often contain DEHP/DBP phthalates (Source: Huak).
- Additional EU Battery Regulation 2023/1542: Energy storage batteries are also subject to restrictions on lead, cadmium, and mercury;
they are governed by a dual-control regime involving both RoHS and the Battery Regulation (Source: learnbess/CTI).
IV.
Testing Process
- Step 1 (Consultation & Application): Submit an application form, product description, BOM, and internal structure photos to a third-party testing agency with CNAS/CMA accreditation (Source: Shitong/Huayu).
- Step 2 (Evaluation & Quotation): The agency determines fees and timelines based on the number of materials, color varieties, test items, and whether expedited service is required;
sales staff estimate testing points and provide a quote (Source: Shitong/Huayu). - Step 3 (Sample Disassembly & Submission): Disassemble samples into homogeneous materials (housings, wires, solder, PCBs, coatings, labels);
send small components separately and ensure the smallest component weighs at least 5g (Source: Shitong/NTEK). - Step 4: Laboratory Testing – Initial screening via XRF, followed by chemical testing for high-risk or borderline materials;
spectra and data are recorded (Source: Huayu/Shitong). - Step 5: Report Issuance & Compliance – Reports ensure traceability of samples, methods, limits, and results; if non-compliant, materials or suppliers are changed and re-testing is performed;
technical documentation is compiled (test reports, BOM, supplier declarations, risk assessments, DoC), followed by DoC signing and CE marking (Source: Huayu/Shitong).
V. Timeline and Costs
- Timeline: Standard turnaround is 5–10 working days (CTI: 4 days; GRG/NTEK: 5–7 days); expedited service available;
complete unit testing time depends on the number of test points (Source: CTI/GRG/NTEK). - Domestic Costs: Approx. 600 RMB per material (bulk pricing available for multiple materials);
complete unit costs are calculated by aggregating material costs (Source: NTEK). - Export Complete Unit Reference: Third-party lab RoHS testing for a product family costs $500–$2,000 and takes 2–4 weeks;
component-level testing is cheaper (Source: Alibaba). - Pre-compliance is key to cost savings: Conducting pre-compliance testing ($1,000–$3,000) before formal submission allows for early detection of limit violations and design adjustments, avoiding the $5,000–$15,000 cost and multi-week delay of a failed formal lab test;
ROI is approximately 3–5 times the investment (Source: Alibaba). - Report Validity: No strict expiration date for RoHS reports, but re-testing is required if materials, suppliers, or processes change; old reports become invalid if standards are revised (Source: Huayu/NTEK).
VI. Compliance Requirements and Common Misconceptions
- RoHS is a CE-related directive: A Declaration of Conformity (DoC) and technical documentation (based on the harmonized standard EN IEC 63000:2018) must be prepared. The manufacturer is responsible for the conformity assessment (Module A) and internal production control, and documents must be retained for 10 years (Source: UL/Sorena).
- Misconception 1: An XRF report is sufficient.
XRF is only for preliminary screening and is not accepted for EU customs clearance or as proof of CE compliance;
chemical analysis reports (ICP/GC-MS) are the basis for determining compliance (Source: Huak). - Misconception 2: Testing the assembled unit as a composite sample is sufficient.
Testing only a composite sample of the whole unit cannot prove the compliance of each homogeneous material; this carries a high risk of failing inspections.
Components should be broken down into homogeneous materials for testing (Source: Huayu/Alibaba). - Misconception 3: A supplier declaration absolves the manufacturer of liability.
A supplier’s RoHS declaration serves only as supporting documentation; the manufacturer remains the party responsible for the compliance conclusion (Source: Sorena/UL). - Exemptions must be specified: For exemptions under Annex III/IV, the technical documentation must clearly state the specific item, scope, category, and expiration date;
failure to specify these details will result in a finding of non-compliance (Source: Sorena).
VII. Procurement Recommendations
- Request RoHS 10 reports for the complete unit or components: Ensure the report includes matching model numbers, a breakdown of homogeneous materials, the testing method (IEC 62321), and a determination against limits;
verify authenticity via the testing agency’s database (Source: Silvereye/CTI). - Require a full set of technical documentation from suppliers: Test reports, Bill of Materials (BOM), supplier RoHS declarations, IEC 62474 material declarations, and the DoC.
Retain these documents for 10 years to be prepared for market surveillance at any time (Source: Sorena/UL). - Arrange testing based on product layers: Test items such as solder, plating, plastics, and cables individually. If only a report for the complete unit is provided, require the supplier to submit supplementary details on key materials (Source: Huayu/Alibaba).
- Incorporate RoHS requirements into procurement contracts: mandate the delivery of RoHS 10 reports and Declarations of Conformity (DoC); require suppliers to re-test following material or supplier changes;
and stipulate liability for recalls and fines in the event of failed random inspections (Source: Huayu/EU). - Prioritize documentation for both components and finished products: Southeast Asian manufacturers often face hurdles during buyer audits due to incomplete component-level documentation;
combining incoming material spot checks with XRF pre-screening for critical components serves as a cost-effective safeguard (Source: Alibaba/Infinita).
Trends and Summary
- Expanding scope of control: TBBP-A and MCCPs are proposed for addition;
multiple lead exemption directives (e.g., 2024/232, 2024/1416, 2025/1802) are due for renewal or expiration in 2026, necessitating a review of lead-containing applications (Source: CTI/Alibaba). - Convergence of green and circular economy principles: EU Battery Regulation requirements regarding carbon footprint and recycled content;
RoHS evolving toward sustainability and full lifecycle management (Source: UL/VDE). - Standardized tiered testing approach: XRF pre-screening (production line/incoming materials) followed by ICP/GC-MS chemical verification (for compliance determination) and EN IEC 63000 technical documentation has become the standard workflow (Source: Huak/VDE).
- Normalization of compliance management: Integrating BOM-level substance lists, supplier qualification, change management, and annual spot checks transforms RoHS compliance from a one-time test into an ongoing management process (Source: Infinita/Huayu).
- For purchasers, the answer regarding how RoHS testing for PV energy storage components is conducted is as follows: Process = Consultation/Application (BOM) → Quotation → Sample submission based on homogeneous material breakdown → XRF preliminary screening → ICP/GC-MS chemical verification → Report issuance → Preparation of technical documentation & Declaration of Conformity (DoC) → CE marking. Key points: Ensure coverage of the 10 RoHS substances; turnaround time is 5–10 working days; cost is approximately 600 RMB per material; pre-compliance assessment ($1k–$3k) saves on re-testing costs. Risk areas include lead in solder, flame retardants in plastics, phthalates in PVC, and hexavalent chromium in plating. Note that XRF is only for preliminary screening, while chemical analysis reports serve as the basis for compliance;
documentation must be retained for 10 years—treat RoHS as a mandatory acceptance criterion and maintain ongoing management.
