PV & BESS Assessor Bonn — Technical Connection Requirements Bonn-Netz

As assessors, we prepare reports in Bonn and the Rhein-Sieg district for system operators, investors, and courts. The historic building stock in Bad Godesberg and Bonn's Suedstadt requires particular care with PV projects — this is precisely where knowledge of Bonn-Netz's TAB proves crucial for a standards-compliant installation. In disputes over grid connection requirements, we mediate as a neutral authority.

What are the special features of the Bonn grid area?

Bonn-Netz supplies the federal city of Bonn with approximately 330,000 inhabitants. In the former government quarter and the Gruenderzeit districts, many existing buildings are equipped with older meter cabinets that need to be modernized when installing PV. Bonn declared solar expansion a municipal obligation in 2024.

Which standards apply to PV systems in the Bonn grid area?

Standard	Scope	Relevance for PV
VDE-AR-N 4100	Technical connection rules low voltage	Mandatory — meter location, service entrance, protection concept
VDE-AR-N 4105	Generation systems on LV grid	Mandatory for PV ≤ 135 kW
VDE-AR-N 4110	Technical connection rules medium voltage	Mandatory for PV > 135 kW
Supplementary TAB Bonn-Netz	Regional supplements	Grid operator-specific requirements
DIN VDE 0100-600	Initial verification of electrical installations	Mandatory inspection before commissioning

How does the PV system registration process work at Bonn-Netz?

1. Engage a certified electrical contractor: Only registered installers may submit the registration (exception: balcony power plants).
2. Grid compatibility assessment: For systems from approx. 30 kWp, Bonn-Netz checks the grid's absorption capacity.
3. Commissioning application: The installer submits data sheets, site plan, circuit diagram, and conformity certificates.
4. Prepare meter location: Must comply with VDE-AR-N 4100 and the supplementary TAB.
5. Installation and initial verification: Testing per DIN VDE 0100-600 by the electrical contractor.
6. Meter installation and commissioning: Bonn-Netz installs the bidirectional meter. MaStR registration is mandatory.

What are the requirements for the meter location?

Requirement	Specification
Meter type	eHZ in three-point mounting system
Surge protection	Type 1+2 combined arrester (mandatory for new systems)
SLS switch	Selective line protection switch upstream of the meter
Space reserve	Min. 1 slot for smart meter gateway
Equipotential bonding	Connection to main earthing busbar

Protection Concept PV/BESS System — Single-Line Diagram

How are balcony power plants registered with Bonn-Netz?

Plug-in generation systems up to 800 W can be registered with Bonn-Netz through a simplified process.

Grid Connection Process Overview

Important Documents and Forms

Which transmission system operator is responsible in Bonn?

Bonn is located in the Amprion control area. The responsible transmission system operator (TSO) is Amprion GmbH. Amprion is responsible for system stability in the extra-high voltage grid (220/380 kV) and coordinates the feed-in of renewable energy at the transmission grid level.

Level	Operator	Voltage Level	Relevance for PV/BESS
Transmission grid	Amprion	220-380 kV	System stability, EEG feed-in
Distribution grid	Bonn-Netz	0.4-20 kV	TAB, grid connection, meter location
Customer system	System operator	0.4 kV (LV)	PV array, BESS, inverter

What are typical challenges for PV and BESS in Bonn?

Bonn has specific regional characteristics as a location for PV and BESS projects that must be considered during planning and assessment:

Federal Quarter and Government Buildings

Bonn's Federal Quarter with former government buildings is increasingly being developed with solar. The buildings of the Federal Republic are subject to special security requirements — PV assessments must meet extended requirements here.

Hillside Locations at the Siebengebirge

Bonn's eastern districts (Bad Godesberg, Mehlem) are situated at the Siebengebirge hills. Slope angle and shading from forest stands require precise yield calculations with terrain models.

Flood Protection Rhine Floodplains

Bonn is partially located in the Rhine flood zone. BESS in Beuel and the Rheinaue require installation above the HQ200 level and watertight enclosures for power electronics.

Deutsche Telekom and Post: Campus PV

The Bonn corporate headquarters (Telekom, Post/DHL) are driving large rooftop PV projects. Systems above 1 MWp require dedicated protection concepts and coordination with Bonn-Netz.

When is an expert assessment advisable?

Occasion	Our Service
Acceptance assessment	TAB conformity check, defect report
Dispute with grid operator	Independent technical evaluation
Systems from 30 kWp / medium voltage	Supervision, grid compatibility assessment
Defect assessment	DIN VDE 0100-600, thermography, EL
Capacity bottleneck	Grid analysis, alternative concepts

Frequently Asked Questions — TAB Bonn-Netz Bonn

Contact Details Bonn-Netz GmbH

Address	Bonn-Netz GmbH, Sandkaule 2, 53111 Bonn
Phone	0228 711-0
Email	netzanschluss@bonn-netz.de
Website	Bonn-Netz — TAB

Related Topics

Last updated: 2026-06-16 | Author: Christoph S. Prestele, TUV-certified expert assessor | Source: Bonn-Netz GmbH