Synergrid C10/26 list: is my inverter on the list – and what if it is not?
What the Synergrid C10/26 list is, why grid operators and inspection bodies require it, how to read reference, firmware, Smax and restrictions correctly – and how to check a device in seconds.
Synergrid C10/26 list: is my inverter on the list – and what if it is not?
Short answer: the Synergrid C10/26 list is the Belgian register of every inverter, hybrid inverter and battery system homologated under the technical prescription C10/11 (Annex D). As a rule, the grid operators (Fluvius, ORES, RESA, Sibelga) accept only listed devices at registration – in the listed firmware version. If a device is not listed, the only route left is an individual proof of conformity against C10/11, which the grid operator has to accept. To find out whether a device is on it, use the free Synergrid C10/26 check by PlanElec – the data is reconciled with the official list every day.
What is the Synergrid C10/26 list?
Synergrid is the federation of Belgian electricity and gas grid operators. The prescription C10/11 defines the technical requirements that decentralised generation units (PV inverters, home batteries, CHP, wind) must meet on the low-voltage grid: protection functions during grid disturbances, frequency and voltage behaviour, power control.
The C10/26 list is its practical result: manufacturers have their devices tested against C10/11; approved device types are published with reference number, firmware version and technical data. Synergrid keeps the list up to date as an Excel file; the current edition refers to C10/11 edition 2.4 (15/10/2025) and contains more than 8,000 active devices from around 290 brands.
Why the list matters for registration and inspection
| Step | Role of the C10/26 list |
|---|---|
| Registration with the grid operator | Fluvius, ORES, RESA and Sibelga require a listed device; the inverter type is requested in the registration form |
| Conformity inspection | The inspection body checks the inverter against the single-line diagram and the manufacturer data |
| Injection approval | Without a homologated device the grid operator does not release feed-in |
| Firmware update or replacement | A new firmware version or a replacement device must be listed again |
For residential PV systems up to 10 kVA, AREI Art. 7.112 (requirements on the electrical installation itself) applies in addition – both must be right. The guide PV system in the single-line diagram shows what the diagram looks like.
How to read a list entry
Each row describes one combination of model and firmware. The key columns:
| Column | Meaning |
|---|---|
Reference (e.g. GLV052-09-0003) | Synergrid homologation number of the device – complements brand and model in the registration (not always unique per model) |
| Brand / series / model | Manufacturer designation, exactly as on the rating plate |
| Firmware | Tested software version; the homologation applies to this version only |
| Pac,r (W) | Rated active power at the AC output |
| Smax (VA) | Maximum apparent power – decisive for the power class; grid operators typically cap single-phase generation units at around 5 kVA (check the exact threshold with your grid operator) |
| Phases | Single-phase or three-phase |
| Application | Solar, storage, CHP, wind, backup |
| Restrictions | Conditions under which the device is admitted (see below) |
| Homologated since | Date of final (or provisional) homologation |
Why the firmware version counts
The protection functions under C10/11 are software. A device running a firmware other than the listed one counts as not homologated at registration and inspection – even if the model itself is on the list. Check the firmware on the device or in the manufacturer's app and compare it with the list entry.
Interpreting restrictions correctly
| Restriction on the list | What it means |
|---|---|
| Only within a module < 800 W | Admitted solely as part of a plug-in generation unit (balcony solar, plug-in battery) |
| Small generating installations only | Not for larger installations with extended requirements |
| High-voltage connection only | Not for domestic connections on the low-voltage grid |
| Backup power system only | Homologated for backup supply only, not for feeding into the grid – the unit supplies an isolated part of the installation during an outage |
Plug-in solar and plug-in batteries: the same list
Micro-inverters and plug-in batteries up to 800 W – Marstek, Zendure, Anker Solix, HomeWizard or Hoymiles, for instance – must also be on the C10/26 list, usually with the restriction "only in module < 800 W". A device sold in Germany or the Netherlands is not automatically admitted in Belgium: the Belgian grid protection settings (C10/11) differ, and the manufacturer must have the Belgian variant homologated separately. So check before buying whether the specific model is listed. Even a listed plug-in device must be registered with the grid operator; the electrical installation itself remains subject to the AREI. If you are specifically after a battery, use the Synergrid C10/26 check for home batteries – the same list, but written for batteries and hybrid inverters.
Common mistakes in practice
- Model checked without its suffix –
SUN2000-8KTL-M0andSUN2000-8KTL-M1are different entries. - Firmware not compared – the device is listed but installed with an older version.
- Expired homologation overlooked – Synergrid withdraws entries; the device then appears under "expired".
- Imported from abroad – same name, different country variant without Belgian homologation.
- Battery forgotten – the battery inverter needs a list entry too, not only the PV inverter. See Home battery and AREI.
Check a device in seconds
The Synergrid C10/26 check loads the official list daily and makes it searchable:
- Type the brand – suggestions show how many models are listed per brand.
- Refine the model – keep typing until the exact model appears; expired entries are flagged.
- Read the result – the table shows firmware, Smax, Pac, phases, application, restrictions and the Synergrid reference; sortable and filterable by phases, segment and status.
- No match? – the tool suggests technically comparable homologated devices of the same power class.
Filters and sorting are kept in the URL, so the link can be passed straight to a customer or colleague.
Limits of the tool
The tool is a search aid, not an official statement. The official list on synergrid.be remains authoritative; in case of discrepancy the official list prevails. The tool does not check the electrical installation itself (protection, RCD, cable size, isolator) – that is what the AREI self-check in PlanElec's single-line diagram is for.
Frequently asked questions
Do I have to put the Synergrid reference in the registration? Grid operators primarily ask for brand, model and firmware version. The GLV reference is a useful addition but not always unique per model: Synergrid sometimes assigns the same reference to several models. So state the reference and the model designation.
My device is listed, but the entry is "expired" – what now? The homologation has been withdrawn or has lapsed. For new installations the device is no longer admitted; existing installations are generally unaffected. When in doubt, ask the grid operator.
Does the list also apply in Wallonia and Brussels? Yes. C10/11 and C10/26 are Synergrid prescriptions and apply nationwide to all distribution grid operators.
How often does the list change? Synergrid publishes new editions regularly; the tool picks up changes daily and shows the date of its data.
Related articles
- Documenting a PV system in the single-line diagram
- Home battery and AREI
- Electrical inspection in Belgium
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