A grid study is a technical assessment by Fluvius to determine whether your installation can be safely and compliantly connected to the distribution grid (including voltage quality, protections, grid capacity).

Since the beginning of 2024, a grid study is only mandatory from 25 kVA (previously from 10 kVA). Up to and including 25 kVA you do not need to request a grid study.

No grid study needed up to 25 kVA (small production installation)

With Fluvius, no grid study is needed as long as the total AC inverter capacity of your entire installation (sum of all inverters: PV, battery/hybrid, V2G, ...) is a maximum of 25 kVA.

Grid study for installations above 25 kVA

From more than 25 kVA you fall under "large production installations" and you must request a grid study. Fluvius requests among other things EAN code, type/capacity of the inverters and (if applicable) a single-line diagram of the customer cabin.

Accelerated grid study (25 to 56 kVA)

For files with a total inverter capacity of 25 to 56 kVA, an accelerated grid study is often used: you quickly receive (free) feedback on whether a detailed (paid) study is needed.

Full (paid) grid study (above 56 kVA)

Above 56 kVA, a full and paid study is usually required before connection.

Additional technical thresholds you should know

> 30 kVA: additional grid disconnection / interface protection

At > 30 kVA, an additional grid disconnection / interface protection is usually required to ensure safe parallel operation with the distribution grid, according to Synergrid C10/11 and Fluvius connection conditions.

Phase distribution and limits per connection (single-phase / three-phase)

In terms of phase distribution, limits also apply: on a single-phase connection, a maximum of 5 kVA inverter capacity may be installed. A three-phase inverter may be connected up to 10 kVA without grid study.

The key threshold is 30 kVA total installed AC inverter capacity (Smax) of the entire installation. All inverters count together (PV, battery, hybrid, V2G, ...).

Up to and including 30 kVA: no external grid disconnect relay needed

For installations ≤ 30 kVA, the integrated automatic disconnection system of the inverter(s) is sufficient, provided the inverter(s) are homologated and appear on the Synergrid C10/26 list.

Above 30 kVA: external grid disconnect relay mandatory

For installations with total AC inverter capacity > 30 kVA, an external grid disconnect panel with a homologated grid disconnect protection relay is required. The relay must appear on the Synergrid list C10/21 or (where applicable) C10/23.

Important: capacities are added together.

You add up all inverters, for example 20 kVA PV + 20 kVA battery = 40 kVA total → external grid disconnect panel with relay C10/21/C10/23 mandatory.

This depends on distance, power and type of charging point. We fully dimension this according to AREI.

Only if your current board has insufficient capacity or protections. Otherwise we expand purposefully.

Yes. For larger sites we take care of the complete medium voltage preparation.

Yes. We deliver the installation AREI-compliant with all necessary certificates.