CROSS-STANDARD public interest · Solar PV inverter

China-to-Nepal Solar PV Inverter Compliance Gap Matrix

AI-compiled from official public sources — cross-checked by multiple AI models, not human-verified. Informational only; see disclaimer. Public-interest, source-linked comparison of common China solar PV inverter documentation against Nepal NBSM conformity requirements, NEA grid-connection and net-metering rules, AEPC quality standards for subsidised solar programmes, IEC 62109-1/-2 safety evidence, IEC 62116 anti-islanding, IEC 62920 EMC, 50 Hz 230/400 V grid settings, and NS / IEC standards context — versus China GB/T 37408 and GB/T 19964 baselines.

Dataset 2026-06-11 Last verified 2026-06-14 4 rows

GAP MATRIX

Compliance Gap Matrix

Gap matrix
Compliance item Common China baseline Nepal (NBSM / NEA) Gap / action Source + verification date
EMC — IEC 62920 and IEC 61000-3-2 for PV Inverters — NBSM / NEA Nepal Requirements Chinese PV inverter EMC is assessed under GB/T 37408-2021 (Technical Requirements for Photovoltaic Grid-Connected Inverters), which includes EMC test requirements aligned with China's domestic framework. GB/T 37408 EMC testing is conducted at CNAS-accredited Chinese laboratories. While IEC 62920 draws on IEC 61000-series test methods used in Chinese domestic standards, the GB/T 37408 EMC test scope and referenced limits are not harmonised with IEC 62920 and IEC 61000-3-2 as required for Nepal NS / IEC conformity. Chinese EMC certificates based solely on GB/T 37408 are not accepted as IEC 62920 or IEC 61000-3-2 compliance evidence for NBSM NS conformity assessment or NEA project submissions.GB/T 37408-2021 — 光伏并网逆变器技术要求 (Technical Requirements for Photovoltaic Grid-Connected Inverters) — includes EMC test requirements Nepal's EMC requirements for solar PV inverters are addressed through NS (Nepali Standard) adoption of IEC standards, administered by NBSM (Nepal Bureau of Standards and Metrology). IEC 62920 (Photovoltaic power generating systems — EMC requirements and test methods for power conversion equipment) and IEC 61000-3-2 (Electromagnetic compatibility — Limits for harmonic current emissions) are the relevant IEC benchmarks adopted or referenced in Nepal's NS framework for PV inverters. NEA connection rules for grid-tied inverters reference harmonic emission limits consistent with IEC 61000-3-2. No standalone Nepal-specific EMC technical regulation exclusively for solar inverters has been confirmed; EMC requirements for Nepal PV inverters derive from NS / IEC adoption and NEA's grid-connection technical conditions. IEC 62920 is the dedicated EMC standard for PV power conversion equipment and is the expected evidence baseline for compliant grid-tied inverters.IEC 62920 — Photovoltaic power generating systems — EMC requirements and test methods for power conversion equipment (adopted or referenced via NS / IEC framework by NBSM)
IEC 61000-3-2 — Electromagnetic compatibility — Limits for harmonic current emissions (equipment with input current up to 16 A per phase) (referenced in NEA grid-connection technical conditions)
NBSM NS standards — Nepal Bureau of Standards and Metrology, adopting IEC standards as Nepali Standards (NS)		 Chinese GB/T 37408 EMC testing does not satisfy Nepal's NS / IEC-based IEC 62920 and IEC 61000-3-2 requirements. Exporters should obtain: (a) IEC 62920 EMC type-test report from an ILAC-accredited laboratory covering the specific inverter model; (b) IEC 61000-3-2 harmonic current emission test report for the model. These reports should be specific to the power rating and configuration of the inverter being supplied to Nepal. Where harmonics test results were obtained under Chinese grid conditions (220/380 V), consider whether retesting under Nepal grid conditions (230/400 V, 50 Hz) is required by the NBSM conformity assessor or NEA project engineer.[INFORMATIONAL] Chinese GB/T 37408 EMC certificates do not satisfy Nepal's NS / IEC-based IEC 62920 and IEC 61000-3-2 requirements. Obtain IEC 62920 and IEC 61000-3-2 type-test reports from an ILAC-accredited laboratory for the specific inverter model before NBSM NS conformity assessment or NEA project submission. Confirm whether Nepal grid voltage conditions (230/400 V) require retesting compared to test results obtained under 220/380 V Chinese grid conditions. Verify current NBSM NS standards adoption status directly at nbsm.gov.np. Nepal Bureau of Standards and Metrology (NBSM)2026-06-14 · unverified
NEA Grid-Connection Standards — Anti-Islanding (IEC 62116), Net-Metering Rules, and 50 Hz / 230 V / 400 V Settings Chinese grid-connection evidence commonly includes GB/T 19964-2024 (Technical Requirements for Connecting Photovoltaic Power Station to Power System, applicable to utility-scale PV via 10 kV and above), NB/T 32004 (inverter technical specifications), and domestic anti-islanding test results under Chinese grid conditions. These Chinese grid-connection documents are based on Chinese grid conditions and are not accepted as NEA grid-connection evidence. The key parameter difference is voltage: China's grid standard is 220/380 V at 50 Hz under GB/T 156, whereas Nepal NEA specifies 230/400 V at 50 Hz. Firmware protection thresholds validated for Chinese grid conditions must be re-parameterised and retested for Nepal NEA grid conditions before seeking grid-connection approval.GB/T 19964-2024 — 光伏发电站接入电力系统技术规定 (Technical Requirements for Connecting Photovoltaic Power Station to Power System)
GB/T 156 — 标准电压 (Standard voltages)
NB/T 32004-2018 — 光伏并网逆变器技术规范 (Technical Specification for Photovoltaic Grid-Connected Inverters)		 Nepal Electricity Authority (NEA) governs grid connection and net-metering for solar PV installations in Nepal. Key grid-connection requirements for PV inverters include: (1) IEC 62116 anti-islanding — inverters must detect loss of mains and disconnect automatically to protect NEA line workers; (2) IEC 61727 characteristics of the utility interface for PV systems; (3) compliance with NEA's net-metering regulations (Electricity Regulatory Commission net-metering rules, amended); (4) firmware and protection relay settings validated against Nepal's grid parameters of 50 Hz, single-phase 230 V, and three-phase 400 V. Nepal's grid is hydro-dominant with growing solar penetration for energy mix diversification and rural electrification. Inverter protection thresholds set for Chinese grid conditions (220/380 V under GB/T 156) must be re-parameterised and validated for Nepal's 230/400 V grid before NEA grid-connection approval.IEC 62116 — Utility-interconnected photovoltaic inverters — Test procedure of islanding prevention measures (anti-islanding requirement for NEA grid connection)
IEC 61727 — Photovoltaic (PV) systems — Characteristics of the utility interface (grid interface requirements for PV systems)
Nepal Electricity Regulatory Commission — Net-metering regulations (net-metering rules for grid-tied solar PV)
NEA grid parameters: 50 Hz, 230 V single-phase, 400 V three-phase		 Gap: Chinese GB/T grid-connection documents do not satisfy NEA grid-connection requirements. Exporters must prepare: (a) IEC 62116 anti-islanding test report from an ILAC-accredited laboratory; (b) IEC 61727 grid interface compliance evidence; (c) harmonic emission compliance evidence per IEC 61000-3-2; (d) NEA net-metering application documentation confirming inverter model eligibility. Additionally, firmware protection thresholds and reconnection delays must be validated for Nepal's 230/400 V, 50 Hz grid — not the 220/380 V Chinese grid parameters. Where inverter firmware settings differ from the factory default for China, re-parameterisation should be documented and, if the change is material, re-tested under the applicable IEC standard.[INFORMATIONAL] NEA grid-connection requires IEC 62116 anti-islanding and IEC 61727 grid interface compliance — neither is covered by Chinese GB/T grid certificates. Re-parameterise inverter firmware for Nepal's 230/400 V at 50 Hz grid before testing and document the configuration. Verify current NEA net-metering regulations and connection conditions directly with NEA and the Electricity Regulatory Commission before finalising the equipment compliance package. Nepal Electricity Authority (NEA)2026-06-14 · unverified
AEPC Distributed and Off-Grid Solar Programme — Quality Standards and Equipment Eligibility China does not have a direct equivalent programme for off-grid rural electrification subsidies with IEC-based equipment eligibility criteria. Subsidised distributed solar in China is governed by National Energy Administration (NEA China) distributed PV policies and grid operator connection rules, referencing domestic standards (NB/T 32004, GB/T 37408-2021, GB/T 19964-2024). These Chinese distributed connection rules and subsidy frameworks are not applicable in Nepal and do not give any presumption of compliance with AEPC programme requirements. Chinese manufacturers seeking to supply AEPC-subsidised projects must obtain AEPC technical approval on the basis of IEC-referenced evidence, not Chinese domestic certifications alone.NB/T 32004-2018 — 光伏并网逆变器技术规范 (Technical Specification for Photovoltaic Grid-Connected Inverters)
GB/T 37408-2021 — 光伏并网逆变器技术要求 (Technical Requirements for Photovoltaic Grid-Connected Inverters)
GB/T 19964-2024 — 光伏发电站接入电力系统技术规定 (Technical Requirements for Connecting Photovoltaic Power Station to Power System)		 The Alternative Energy Promotion Centre (AEPC) governs subsidised off-grid and distributed solar programmes for rural electrification in Nepal, including the Rural Energy Fund and Renewable Energy Subsidy Policy. AEPC requires: (a) equipment to meet AEPC technical quality standards, which reference IEC standards for inverters and solar PV components; (b) installation by AEPC-approved service companies or contractors; (c) compliance with AEPC's specification for inverters, including safety and performance criteria derived from IEC 62109 and IEC 61727; (d) AEPC subsidy claim documentation confirming equipment model eligibility. Chinese PV inverters supplied to AEPC-subsidised projects must pass AEPC technical review as a condition of subsidy eligibility and programme participation.AEPC Technical Standards for Solar PV Inverters — references IEC 62109 and IEC 61727 for safety and grid-interface performance
Nepal Renewable Energy Subsidy Policy — AEPC equipment eligibility requirements for subsidised solar programmes
AEPC Rural Energy Fund — quality and technical criteria for programme participation		 Gap: Chinese inverters for Nepal AEPC-subsidised projects must be technically approved by AEPC on the basis of IEC-referenced evidence. Chinese domestic solar connection approvals and certifications do not transfer to AEPC programme requirements. Confirm inverter model eligibility, IEC safety and performance test evidence, and service company registration with AEPC before committing product to subsidised rural solar programmes. Nepal's significant import volume from China and India means Chinese products are commonly supplied — but AEPC technical review remains a separate and mandatory gate.[INFORMATIONAL] AEPC is a separate equipment approval gate from any Chinese domestic solar certification. Confirm inverter model eligibility and IEC compliance evidence with AEPC and the AEPC-approved service company before project submission for subsidised rural solar programmes. Verify current AEPC technical standards, subsidy policy criteria, and equipment eligibility requirements directly at aepc.gov.np before committing to supply. Alternative Energy Promotion Centre (AEPC), Nepal2026-06-14 · unverified
IEC 62109-1 / IEC 62109-2 Safety Evidence — NBSM NS Conformity and NEA Solar PV Grid-Connection China's primary voluntary standard for PV grid-connected inverter safety is GB/T 37408-2021 (Technical Requirements for Photovoltaic Grid-Connected Inverters), which covers classification, environmental conditions, safety, electrical performance, EMC, and markings. GB/T 37408 is a China domestic standard assessed by CNAS-accredited Chinese laboratories. It shares conceptual safety intent with IEC 62109-1/-2 but is not harmonised with IEC 62109 and is not accepted by NBSM, NEA, or AEPC as equivalent to IEC 62109 type-test evidence. Chinese manufacturers exporting to Nepal must supplement GB/T 37408 certifications with IEC 62109-1/-2 type-test reports from ILAC-accredited laboratories to meet NS conformity requirements.GB/T 37408-2021 — 光伏并网逆变器技术要求 (Technical Requirements for Photovoltaic Grid-Connected Inverters) Nepal's safety requirements for solar PV inverters are governed through NBSM (Nepal Bureau of Standards and Metrology) NS (Nepali Standard) certification, which adopts IEC standards. IEC 62109-1 (Safety of power converters for use in photovoltaic power systems — Part 1: General requirements) and IEC 62109-2 (Part 2: Particular requirements for inverters) are the applicable safety standards under Nepal's NS / IEC framework for PV inverters. NS certification from NBSM is required for regulated products at the import stage; inverters must demonstrate conformity with NS / IEC 62109-1/-2 safety requirements. NEA grid-connection technical conditions and AEPC programme quality standards both reference IEC 62109-based safety evidence for inverters. Third-party type-test evidence from an ILAC-accredited laboratory is the expected evidence format for NS conformity assessment and project owner procurement.IEC 62109-2 — Safety of power converters for use in photovoltaic power systems — Part 2: Particular requirements for inverters (adopted as NS via NBSM; required for NEA grid-connection and AEPC programme)
IEC 62109-1 — Safety of power converters for use in photovoltaic power systems — Part 1: General requirements (parent standard; implicitly applicable as Part 2 cannot be assessed independently)
NBSM NS certification — Nepal Bureau of Standards and Metrology conformity assessment for regulated products at import		 Chinese GB/T 37408 safety certification does not satisfy Nepal NBSM NS / IEC 62109-2 conformity requirements for import or NEA grid-connection. Exporters must obtain IEC 62109-1/-2 type-test certificates from an ILAC-accredited laboratory covering the specific inverter model or family being supplied to the Nepal project. Existing Chinese safety certificates based solely on GB/T 37408 must be supplemented with IEC 62109-1/-2 test reports before submitting equipment documentation for NBSM NS certification, NEA grid-connection approval, or AEPC programme eligibility. Nepal imports significantly from China and India — NBSM routinely receives IEC-based evidence from Chinese manufacturers and expects it as the standard documentation basis.[INFORMATIONAL] A solar PV inverter holding only Chinese GB/T 37408 certification cannot satisfy Nepal NBSM NS / IEC 62109 conformity requirements or NEA grid-connection safety evidence requirements. Plan for IEC 62109-1/-2 type testing by an ILAC-accredited laboratory before submitting equipment documentation for NBSM NS certification, NEA grid-connection approval, or AEPC programme eligibility in Nepal. Verify current NBSM NS standards adoption status and regulated product scope directly at nbsm.gov.np before committing to a test programme. Nepal Bureau of Standards and Metrology (NBSM)2026-06-14 · unverified

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