How to Check Solar Inverter Certification for Europe: CE Marking Under the LVD and EMC Directive, IEC 62109 Safety, the RfG Type A–D Classes and Equipment Certificates, EN 50549-1, and the German, Italian and British Connection Rules

Short answer. 'Certified for Europe' is three different things. First, CE marking: product safety under the Low Voltage Directive and electromagnetic compatibility under the EMC Directive, each demonstrated through the manufacturer's conformity assessment (internal production control under the LVD; internal production control, or EU type-examination followed by conformity to type based on internal production control, under the EMC Directive), with harmonised standards cited in the Official Journal giving a presumption of conformity for the requirements they cover; the Radio Equipment Directive defines radio equipment, and which directives apply to a given inverter is for the manufacturer's assessment. Second, grid-connection capability: Regulation (EU) 2016/631 (RfG) classes generating modules from type A (0.8 kW) to type D; for type A it uses an installation document that references equipment certificates where they exist and lets the system operator rely on such certificates; EN 50549-1 is the European standard that spells out the LV capabilities, with national rules on top. Third, the national connection rule of the country of installation — VDE-AR-N 4105 in Germany, CEI 0-21 in Italy, ENA G98/G99 in Great Britain — and the documents each requires. China's GB/T 37408-2019 is the Chinese grid-connection standard for PV inverters; CNWattHub reading: none of the European documents read for this guide refers to it. This guide tells you which document to ask for at each layer.

1. CE marking: safety, EMC, radio

The Low Voltage Directive 2014/35/EU applies to electrical equipment rated between 50 and 1,000 V AC and between 75 and 1,500 V DC (with the Annex II exclusions), and equipment conforming to harmonised standards whose references are published in the Official Journal is presumed to meet the safety objectives covered by those standards or parts of them. The route is Module A, internal production control: the manufacturer alone ensures and declares conformity on the basis of technical documentation including a risk analysis; where the equipment is subject to more than one Union act requiring an EU declaration of conformity, a single declaration is drawn up for all of them; and the CE marking is affixed before the equipment is placed on the market. CNWattHub reading: there is no notified body in this route, so an LVD 'certificate' from a test house is a voluntary attestation; the legal document is the manufacturer's declaration and its technical file.

The EMC Directive 2014/30/EU regulates electromagnetic compatibility; equipment conforming to harmonised standards whose references are published in the Official Journal is presumed to meet the essential requirements covered by those standards or parts of them, and apparatus conformity is shown either by internal production control or by EU type-examination followed by conformity to type based on internal production control. The Radio Equipment Directive 2014/53/EU defines radio equipment as an electrical or electronic product that intentionally emits and/or receives radio waves for radio communication or radiodetermination, or one that must be completed with an accessory such as an antenna to do so. CNWattHub reading: whether an inverter with a Wi-Fi or cellular module is assessed under the RED is a question for the manufacturer's conformity assessment; ask which directives the declaration lists.

The safety standards named on inverter certificates are IEC 62109-1:2010, which sets minimum design and manufacturing requirements for PV power conversion equipment against electric shock, energy, fire, mechanical and other hazards, and IEC 62109-2:2011, which adds particular requirements for DC-to-AC inverters (grid-interactive, stand-alone or multiple-mode, including use with batteries or other storage) and must be used jointly with Part 1. IEC 62116:2014 provides the test procedure for islanding-prevention measures of single- or multi-phase utility-interactive PV inverters, with criteria that are minimum requirements allowing repeatability.

2. Grid connection: the RfG classes and the certificate

Regulation (EU) 2016/631 classes power-generating modules by connection voltage and maximum capacity: type A from 0.8 kW below 110 kV; types B and C from thresholds proposed by each TSO and approved by the relevant regulatory authority or, where applicable, the Member State, not above the Table 1 limits (Continental Europe and Great Britain 1 MW for B, 50 MW for C, 75 MW for D; Nordic 1.5/10/30 MW; Ireland and Northern Ireland 0.1/5/10 MW; Baltic 0.5/10/15 MW); and type D at 110 kV or above, or below 110 kV at or above the D threshold. Type A modules in Continental Europe must stay connected for at least 30 minutes between 47.5 and 48.5 Hz (TSO-specified), without limit between 49.0 and 51.0 Hz, and for 30 minutes between 51.0 and 51.5 Hz; Great Britain's table runs from 47.0 Hz (20 seconds) to 52.0 Hz (15 minutes).

The compliance vocabulary comes from the same regulation. An 'equipment certificate' is a document issued by an authorised certifier for equipment used by a power-generating module, defining the scope of its validity at national or other level where a specific value is selected from the European range, and able to replace parts of the compliance process; an 'authorised certifier' is accredited by the national affiliate of the European co-operation for Accreditation; and an 'installation document' is a simple structured document for a type A module confirming compliance. For type A modules the operational notification consists of submitting an installation document whose minimum content includes the connection location and date, maximum capacity in kW, primary energy source, reference to equipment certificates issued by an authorised certifier, information as directed by the system operator for equipment without a certificate, and the owner's and installer's details and signatures; the system operator may rely on equipment certificates for its type A compliance assessment. CNWattHub reading: for a residential or small commercial inverter the equipment certificate is the document that makes the installer's paperwork simple; ask who issued it, under which accreditation, and for which country's parameter set.

EN 50549-1 (2019, with A1:2023 valid from 1 December 2023 in the consolidated EVS edition) specifies protection functions and operational capabilities for generating plants operating in parallel with LV distribution networks, applies to generating modules of RfG type B or smaller (with national decisions on the A/B and B/C limits), includes electrical energy storage systems, states that DSO or other national requirements must also be complied with, and allows MV-connected plants up to 150 kVA to use Part 1 instead of Part 2 unless the DSO and the responsible party specify otherwise, who may also set a different threshold. CNWattHub reading: the standard is not the whole answer, because it says DSO or other national requirements must also be complied with; ask for an EN 50549-1 test report where the target country's rule or the DSO calls for evidence against it, together with whatever else that rule requires.

3. Three national rules

Germany. VDE-AR-N 4105 edition 2026-03 ('Anschluss und Betrieb von Erzeugungsanlagen am Niederspannungsnetz, TAR EZA NS'), a 144-page application rule issued March 2026, sets additional minimum technical requirements for generating plants and storage connected to the German LV network in addition to VDE-AR-N 4100, applies to all plants operated in parallel with the network operator's grid including non-exporting ones and to extensions of existing plants, and replaces the 2018-11 edition; its listed changes include simplified requirements for plants up to 800 VA and Q(U) as the standard method. CNWattHub reading: evidence issued against the 2018-11 edition refers to the superseded text; ask the supplier and the network operator what the 2026-03 edition requires.

Italy. The CEI catalogue lists CEI 0-21;V2, an amendment to the reference technical rule for connecting active and passive users to LV distribution networks, published January 2024 and valid from February 2024, with a date of withdrawal of August 2026.

Great Britain. ENA EREC G99 Issue 1 Amendment 10 (4 March 2024) sets the technical requirements for connecting type A–D power-generating modules to GB licensed DNO networks and applies to modules outside EREC G98, which covers fully type-tested micro-generators up to and including 16 A per phase; a 'Fully Type Tested' module has an intrinsic design capacity of 50 kW or less and has been tested to G99 with a manufacturer's declaration that all similar modules are built to the same standards with the same performance (and, where interface protection is included, the same protection settings), while 'Type Tested' covers products such as inverters and interface protection tested with such a declaration. G99's compliance matrix shows that a Fully Type Tested type A device is registered on the ENA website via a Compliance Verification Report (Form A2-1, A2-2 or A2-3); an assessment of compliance with EREC G5 and EREC P28 is necessary and will generally allow connection without mitigation, though mitigation may be needed where fault level is unusually low, and otherwise only installation checks on the Installation Document (Form A3-1 or A3-2) are required; whereas Type Tested type A equipment must also demonstrate the requirements not covered by the manufacturer's information and may need additional site compliance and commissioning checks (Form A2-4).

4. What a Chinese certificate does and does not cover

China's national standard GB/T 37408-2019 光伏发电并网逆变器技术要求 was published 10 May 2019, took effect 1 December 2019 and is current, under the China Electricity Council as competent department. CNWattHub reading: it is the Chinese grid-connection requirement, not a European one; none of the European documents read for this guide refers to it, so a GB/T or CQC report is useful background on the design but is not one of the European documents listed above.

Reading table

Checklist

CNWattHub editorial method, not a sourced rule:

1. Read the EU declaration of conformity: which directives, which harmonised standards, which model numbers and firmware.
2. Ask for the IEC 62109-1/-2 and IEC 62116 test reports, not just certificates.
3. Fix the RfG type from the module's maximum capacity and the country's B/C thresholds.
4. For type A products, ask whether an equipment certificate exists, who issued it under which accreditation, and which national parameter set it covers; without one, the system operator will direct what information to supply.
5. Ask which evidence each target country's network operator requires under its national rule, and request the EN 50549-1 test report where that rule or the DSO calls for it; for Germany check the edition date.
6. For Great Britain, look the model up in the ENA type-test register and read the Compliance Verification Report.
7. Treat Chinese GB/T reports as design background only.

Scope limits

EU texts are quoted from the legislation.gov.uk 'as adopted' copies because EUR-Lex was not retrievable; they do not reflect later EU amendments. Standards' full texts were not read; only public scope and catalogue text is cited, except G99, which is read in full. No certifier names, fees, harmonised-standards list, cybersecurity rules or national rules beyond Germany, Italy and Great Britain are covered. Not legal or engineering advice.