SOMVTransfer & Transformer Stations
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Transformer stations for battery storage (BESS)

Whether grid-serving utility storage or commercial storage – we deliver the bidirectional medium-voltage connection to VDE-AR-N 4110, including power-plant controller and protection.

bidirectional power-plant controller up to 3,150 kVA/unit VDE-AR-N 4110 SF6-free
Built for storage operation

A connection that charges and feeds in equally well

Storage works in both directions. Our stations are designed for bidirectional operation and meet the grid operator's control requirements ex works.

01

Bidirectional by design

Transformer, switchgear and protection sized for charge and feed-in operation.

02

Grid-serving control

Integrated power-plant controller for active/reactive power set-points plus telecontrol.

03

Modular and scalable

From a single compact station to a container step-up for utility-scale storage.

Matching stations

Matching stations for storage projects

BESS transformer station

Compact station built for battery storage: bidirectional, with power-plant controller and protection.

bidirectionalcontrollerVDE-AR-N 4110

Container / park station

Step-up for utility-scale storage in the MW range with multi-panel MV and remote monitoring.

MW rangemulti-panel MVremote monitoring

Transfer station

Controlled, metered handover to the public grid.

10–30 kVinstrument meteringNA protection
How the connection works

How the storage reaches the medium-voltage grid

The battery inverter feeds in or draws at low-voltage level. The transformer couples bidirectionally to medium voltage; the transfer station controls and meters at the grid connection point.

For grid-serving operation, the grid operator requires a power-plant controller, NA protection and telecontrol to VDE-AR-N 4110 – all integrable into our stations.

Typical sizing guide

Storage powerTransformer (guide)Recommendation
up to 630 kW630 kVABESS compact station
up to 1,250 kW1,250 kVABESS compact station
up to 2,500 kW2,500 kVABESS station + transfer
up to 3,150 kW3,150 kVABESS station + transfer
> 3,150 kWmultiple unitsContainer / park station

Guide values – the exact sizing is determined by the configurator or our engineering team.

FAQ

Storage grid connection – in brief

It is designed for bidirectional operation (charging and feed-in) and comes with a power-plant controller plus the control and protection required by VDE-AR-N 4110.

For grid-coupled storage operation in the medium-voltage grid, usually yes. It implements the grid operator's active and reactive power set-points; we integrate it into the station.

Up to 3,150 kVA per transformer. Larger storage is split across multiple units or a container step-up.

Yes – made in Europe and shipped worldwide, including transport, customs and commissioning coordination.

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