CROSS-STANDARD public interest · Solar PV inverter
China-to-Bulgaria 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 Bulgaria (BDS/EWRC/ESO) expectations: BDS-adopted standards routes, EWRC and ESO grid-connection processes, CE-marking-aligned requirements, IEC 62109, IEC 62116, IEC 61727, IEC 62920 and IEC 61000 evidence, with 230/400 V 50 Hz grid settings and Varna or Burgas as the main ports — versus China GB/T 37408, NB/T 32004, and GB/T 19964 baselines.
Dataset 2026-06-11
Last verified 2026-06-15
3 rows
GAP MATRIX
Compliance Gap Matrix
| Compliance item | Common China baseline | Bulgaria (BDS / EWRC / ESO) | Gap / action | Source + verification date |
|---|---|---|---|---|
| EMC — IEC 62920 and IEC 61000 Evidence for Bulgaria PV Inverters | Chinese PV inverter EMC evidence commonly relies on GB/T 37408-2021 and related domestic EMC test reports from CNAS-accredited laboratories. These reports can be useful engineering background but are not automatically equivalent to IEC 62920 or the IEC 61000-series evidence requested by a Bulgarian project owner, BDS conformity route, EWRC review, or ESO grid-connection process. China test conditions are normally aligned with the China 220/380 V, 50 Hz baseline, while Bulgaria uses 230/400 V at the same frequency.GB/T 37408-2021 — 光伏并网逆变器技术要求 (Technical Requirements for Photovoltaic Grid-Connected Inverters) CNAS-accredited domestic EMC test reports under China standard scopes |
Bulgaria PV inverter EMC expectations should be prepared on an IEC/EN basis because BDS (Bulgarian Institute for Standardization) adopts EN/IEC standards, and project specifications for grid-connected PV commonly reference IEC-family inverter evidence under the EU EMC Directive 2014/30/EU. The practical EMC package should include IEC 62920 for PV power conversion equipment and applicable IEC 61000-series evidence for emissions, immunity, harmonics, surge, voltage dips, and power quality. For ESO grid-connected projects, harmonic and conducted-emission evidence should be tied to the actual inverter model, rating, and configuration. Bulgaria uses a 230/400 V, 50 Hz grid — EMC and harmonic results obtained only under China 220/380 V conditions should be reviewed for applicability before submission to Bulgarian authorities.IEC 62920 — Photovoltaic power generating systems — EMC requirements and test methods for power conversion equipment IEC 61000 series — Electromagnetic compatibility test, immunity, harmonic, surge, voltage-dip, and power-quality standards as applicable to the inverter configuration Directive 2014/30/EU (EMC Directive) — mandatory for CE marking in Bulgaria as EU member state BDS standards adoption and project specification requirements where applicable ESO grid-connection review requirements for power quality and harmonic performance |
Gap: China-only EMC certificates under GB/T 37408 do not automatically satisfy Bulgaria IEC/EN-based project expectations or EU EMC Directive requirements. Exporters should obtain IEC 62920 and applicable IEC 61000-series reports for the specific model or family, confirm whether harmonics and conducted-emission results remain valid at 230/400 V, and provide surge, earthing, shielding, and enclosure documentation suitable for Bulgarian installation conditions. Where ESO or the project owner specifies harmonic limits or power-quality measurements, test reports should be mapped clause-by-clause to that requirement. Bulgarian-language documentation may be required by local project owners.[INFORMATIONAL] Treat Bulgaria PV inverter EMC as an IEC/EN evidence package, not a China GB/T certificate transfer. Prepare IEC 62920 and applicable IEC 61000-series reports for the exact inverter model, review harmonic and EMC applicability at Bulgaria's 230/400 V 50 Hz grid voltage, and confirm any BDS, EWRC, ESO, or project-owner EMC requirements before shipment. | Bulgarian Institute for Standardization (BDS)2026-06-15 · reference |
| ESO Grid-Connection Review — IEC 62116, IEC 61727, and 230/400 V 50 Hz Settings (Bulgaria) | Chinese PV inverter grid-connection evidence commonly includes GB/T 19964-2024 for PV power station connection, NB/T 32004 for grid-connected inverter technical specifications, GB/T 37408 for PV grid-connected inverter requirements, and domestic anti-islanding test results. These documents are built around China grid conditions and domestic acceptance procedures. China's low-voltage baseline is 220/380 V at 50 Hz, not Bulgaria's 230/400 V at 50 Hz. Chinese grid certificates and factory firmware settings do not automatically transfer to ESO acceptance or EWRC project review in Bulgaria.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) 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 156 — 标准电压 (Standard voltages) |
Grid-connected solar PV inverters in Bulgaria should be treated as project-level grid-connection equipment subject to Electricity System Operator (ESO) technical review and Energy and Water Regulatory Commission (EWRC) energy-sector oversight. The practical IEC evidence package normally includes IEC 62116 anti-islanding and IEC 61727 utility-interface compliance, with firmware protection thresholds, reconnection delay, voltage windows, and frequency windows validated for Bulgaria's 230/400 V, 50 Hz low-voltage grid. Bulgaria uses the same 50 Hz frequency as China, but the nominal voltage differs: Bulgaria is 230 V single-phase and 400 V three-phase (EU standard), while China is 220/380 V under GB/T 156. Large-scale PV projects in Bulgaria are also subject to EU RfG Commission Regulation (EU) 2016/631 above applicable thresholds.IEC 62116 — Utility-interconnected photovoltaic inverters — Test procedure of islanding prevention measures IEC 61727 — Photovoltaic systems — Characteristics of the utility interface EN 50549-1:2019 / EN 50549-2:2019 (CENELEC harmonised grid-connection standards for generators) Commission Regulation (EU) 2016/631 — Requirements for Generators (RfG) ESO project grid-connection and commissioning requirements for the relevant installation EWRC electricity-sector approval or oversight requirements where applicable Bulgaria low-voltage grid context — 230 V single-phase / 400 V three-phase, 50 Hz |
Gap: China GB/T and NB/T grid-connection evidence is not a substitute for Bulgaria ESO project acceptance. Exporters should prepare IEC 62116 anti-islanding evidence, IEC 61727 utility-interface evidence, a Bulgaria-specific settings file, and commissioning records for 230/400 V at 50 Hz. Do not describe Bulgaria voltage as matching China: only the 50 Hz frequency matches, while nominal voltage differs from China's 220/380 V. For large-scale projects, Commission Regulation (EU) 2016/631 compliance under ESO-defined thresholds is required. Bulgarian-language documentation should be prepared for all regulatory submissions.[INFORMATIONAL] Chinese GB/T grid-connection documents do not automatically satisfy Bulgaria ESO grid-connection review. Prepare IEC 62116 and IEC 61727 evidence, re-parameterise inverter firmware for Bulgaria's 230/400 V at 50 Hz grid, and document earthing, surge protection, and commissioning records. Verify current ESO and EWRC project requirements directly before shipment or commissioning. | Electricity System Operator (ESO), Bulgaria2026-06-15 · reference |
| IEC 62109-1 / IEC 62109-2 Safety Evidence for Bulgaria PV Inverters | China safety documentation for PV grid-connected inverters commonly uses GB/T 37408-2021, NB/T 32004, domestic CQC or CGC voluntary certification, and CNAS-accredited laboratory reports. These documents are useful for supplier qualification but are not automatically accepted as IEC 62109-1/-2 evidence for Bulgarian projects. Chinese safety reports may also be based on China-rated configurations, labels, manuals, surge protection, and 220/380 V assumptions, while Bulgarian project files must reflect 230/400 V, 50 Hz installation conditions.GB/T 37408-2021 — 光伏并网逆变器技术要求 (Technical Requirements for Photovoltaic Grid-Connected Inverters) NB/T 32004-2018 — 光伏并网逆变器技术规范 (Technical Specification for Photovoltaic Grid-Connected Inverters) CQC / CGC voluntary certification programmes for China domestic PV inverter safety and performance |
For Bulgaria solar PV projects, inverter safety documentation should be prepared around IEC 62109-1 and IEC 62109-2 type-test evidence for the exact inverter model or family. BDS is the national standards body adopting EN/IEC norms; EWRC oversees the energy sector; and ESO controls the practical grid-connection interface. Project submissions should include accredited IEC safety reports, installation manuals, ratings, nameplate data, protection-device coordination, earthing instructions, and environmental limits. CE marking under LVD 2014/35/EU is mandatory for all PV inverters placed on the Bulgarian market. Bulgarian-language instructions and labelling may be required under national market-surveillance and consumer-protection rules.IEC 62109-1 — Safety of power converters for use in photovoltaic power systems — Part 1: General requirements IEC 62109-2 — Safety of power converters for use in photovoltaic power systems — Part 2: Particular requirements for inverters LVD 2014/35/EU (mandatory CE marking for Bulgaria as EU member state) BDS standards adoption and conformity expectations where applicable EWRC and ESO project documentation requirements for grid-connected solar PV equipment |
Gap: A China-only GB/T 37408 or NB/T 32004 safety file does not automatically satisfy Bulgaria IEC safety expectations or LVD requirements. Exporters should provide IEC 62109-1/-2 type-test reports for the supplied model or model family, confirm that labels and manuals match the Bulgarian configuration at 230/400 V 50 Hz, document protection coordination and earthing, and ensure CE marking is obtained with an EU Declaration of Conformity. Bulgarian-language instructions may be required under national market-surveillance rules. An EU Authorised Representative must be appointed if no EU importer is established.[INFORMATIONAL] Do not rely on China GB/T or NB/T inverter safety files alone for Bulgaria PV projects. Prepare IEC 62109-1/-2 type-test evidence for the exact model, obtain CE marking under LVD 2014/35/EU, align labels and manuals to Bulgaria's 230/400 V 50 Hz configuration, and confirm current BDS, EWRC, ESO, and project-owner safety requirements before shipment. | Bulgarian Institute for Standardization (BDS)2026-06-15 · reference |
E-E-A-T
Named editorial review
Pending named reviewer
Official regulator, standards body, notified body, customs, or primary legal source preferred. Local PDFs are not accepted.
Editorial controlsRows must include publisher, official URL, access date, verification flag, and last_verified before human_reviewed can be true.
SOURCES
Official-source register.
- Bulgarian Institute for Standardization (BDS) · accessed 2026-06-15 · reference · used in 2 rows
- Electricity System Operator (ESO), Bulgaria · accessed 2026-06-15 · reference · used in 1 rows