In the Rhine-Neckar metropolitan region with Mannheim at its center, we prepare assessments for a broad spectrum of PV and storage projects. The Benjamin Franklin Village conversion site, the Quadrate city center, and the commercial parks in northern Mannheim all present entirely different conditions. What they all have in common: the TAB of MVV Netze define the technical rules that we as assessors evaluate and document in every project.
MVV Netze operates the grid in Mannheim with approximately 310,000 inhabitants. MVV is one of the few publicly listed municipal utilities. Large PV projects are being developed on the Benjamin Franklin Village conversion site.
The City of Mannheim funds photovoltaics through its SolarBonus, administered by the Klimaschutzagentur Mannheim. Under the 2026 programme, multi-family buildings from 20 kWp receive EUR 120 per kWp (max. EUR 2,400), PV on green roofs EUR 260 per kWp (max. EUR 4,000) and listed buildings EUR 300 per kWp (max. EUR 4,500). Non-profit organisations receive EUR 140 per kWp from 30 kWp, max. EUR 4,200. Single and two-family houses are only eligible with a green roof or heritage status. The application must be filed before the order is placed, and funds are limited (City of Mannheim).
MVV Netze splits the registration route by capacity. Systems up to 30 kW are registered by the installer via the Installationstechnik-Portal, larger systems via the feed-in request with checklist. The grid operator then checks whether the service connection and upstream grid equipment can take the planned capacity. MVV Netze installs and seals the meters itself. From submission to commissioning the grid operator currently states around six weeks (MVV Netze).
For assessments in Mannheim this means: for subsidised systems we request the SolarBonus grant notice, because the grant enters the profitability calculation. For systems on listed buildings we also check the heritage permit.
| Standard | Subject | Applies to |
|---|---|---|
| VDE-AR-N 4100 | Low-voltage connection | Meter location, service entrance, protection concept |
| VDE-AR-N 4105 | Generation on the LV grid | Mandatory for connection to the low-voltage grid |
| VDE-AR-N 4110 | Medium-voltage connection | Mandatory for connection to the medium-voltage grid |
| Supplementary TAB MVV Netze | Regional requirements | Grid area |
| DIN VDE 0100-600 | Initial verification | Every system before commissioning |
| 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 |
Balcony power plants up to 800 W can be registered with MVV Netze through a simplified process. The BW solar obligation has been in effect since 2022.
Mannheim is located in the TransnetBW control area. The responsible transmission system operator (TSO) is TransnetBW GmbH, in charge of system stability and renewable feed-in in the extra-high voltage grid (220/380 kV).
| Level | Operator | Voltage Level | Relevance for PV/BESS |
|---|---|---|---|
| Transmission grid | TransnetBW | 220-380 kV | System stability, EEG feed-in |
| Distribution grid | MVV Netze | 0.4-20 kV | TAB, grid connection, meter location |
| Customer system | System operator | 0.4 kV (LV) | PV array, BESS, inverter |
Regional points we check when planning and assessing projects in Mannheim:
Mannheim's Quadratestadt with its alphanumeric addressing system (C4, R7) requires precise location descriptions in grid connection applications. Mix-ups can lead to delays of several weeks.
The Friesenheimer Insel offers significant PV potential with BASF neighbors and harbor areas. Emission protection (chemical industry) and explosion protection zones must be considered in BESS planning.
Baden-Württemberg's solar obligation particularly affects Mannheim's new development areas (Franklin site, Glückstein Quarter). Assessments for compliance with or exemption from the obligation are systematically requested.
Under the German Metering Point Operation Act (MsbG), PV systems above 7 kW receive a smart metering system (iMSys) installed by the default metering operator. Assessments on inverter compatibility and metering concepts are particularly relevant here.
| Occasion | Our Service |
|---|---|
| Acceptance | TAB conformity, defect report |
| Dispute with grid operator | Independent technical evaluation |
| From 30 kWp or medium voltage | Supervision, grid compatibility assessment |
| Defects | DIN VDE 0100-600, thermography, EL |
| Grid bottleneck | Grid analysis, alternative concepts |
VDE-AR-N 4100 and 4105 (low voltage) or 4110 (medium voltage) plus supplementary TAB of MVV Netze GmbH.
Exclusively through a certified electrical contractor. Details: MVV Netze website.
Must comply with VDE-AR-N 4100 and supplementary TAB. Older cabinets (pre-2010): eHZ, surge protection, SLS. Cost: EUR 1,000-2,500.
Depends on system size and scope. Contact: info@pv-bess-assessor.com or +49 89 97 31 37 43.
For systems from 30 kWp, medium voltage, grid compatibility issues, disputes with the grid operator, acceptance of commercial systems.
We know the TAB of MVV Netze from daily practice. Get in touch.
Contact Us| Address | MVV Netze GmbH, Luisenring 49, 68159 Mannheim |
| Phone | 0621 290-0 |
| info@mvv-netze.de | |
| Website | MVV Netze — TAB |
We prepare PV and BESS assessments throughout Germany. The following pages summarise the technical connection requirements of the respective grid operator:
Augsburg Berlin Bielefeld Bonn Bremen Dortmund Dresden Düsseldorf Duisburg Frankfurt Hamburg Hannover Karlsruhe Köln Leipzig München Münster Nürnberg Stuttgart
Last updated: 2026-09-28 | Author: Christoph S. Prestele, TUV-certified expert assessor | Source: MVV Netze GmbH