Registering a balcony power plant: Does the grid operator have to install a new bidirectional meter?

For many users, registering a balcony power plant in Germany raises questions about electricity metering. Many wonder whether the grid operator is obliged to install a bidirectional meter and who bears the costs.

Balcony power plants are booming because they allow tenants and owners to easily generate solar power. When registering, the grid operator checks whether the meter correctly measures feed-in and consumption. They often request a modern bidirectional meter.

Market trends for balcony power plants

By the end of 2025, over 500,000 balcony power plants had been registered in Germany. The boom is driven by high electricity prices and Solar Package I, which simplifies registrations. According to the Federal Network Agency, the market is growing by more than 300 percent annually.

Grid operators rely on precise metering, as feed-in affects the grid. By 2032, almost all households are to receive smart meters. VDE standards recommend bidirectional meters for transparency in balcony power plants.

At DRBO Greenenergy, we pursue a clear goal: to advance the decentralized energy transition together with our customers. We already supply numerous DIY stores, specialist retailers, and installation companies with high-quality solar and energy storage solutions. With our expertise, we now also want to support private customers in making clean energy simple and accessible.

When is a bidirectional meter necessary?

A bidirectional meter measures electricity consumption and feed-in separately. Old Ferraris meters with a rotating disc often only record consumption and run backward when power is fed in. Solar Package I temporarily allows this, but grid operators are increasingly demanding bidirectional meters.

Without a bidirectional meter, applications may be rejected or require subsequent registration. The VDE rule AR-N 4105 requires separate metering for grid-connected systems. For systems up to 800 watts, a meter change is not always mandatory, but it is recommended.

Meter installation process

First, users register the balcony power plant in the market master data register of the Federal Network Agency. The grid operator receives a notification and checks the meter. If necessary, they arrange for the replacement by a metering point operator.

Installation usually takes 2 to 8 weeks. Modern meters are digital, MID-certified, and smart meter-enabled. Users do not need to hire electricians – the grid operator coordinates everything.

Costs for the bidirectional meter

The grid operator usually covers the installation costs. By law, the replacement of old Ferraris meters is free of charge. Annual metering point fees amount to a maximum of 20 euros.

For voluntary smart meters, fees of up to 116 euros may apply. A plug-and-play meter as an add-on costs privately 50 to 150 euros. Grid operators such as Netze BW or Westnetz cover the standard replacement.

Top bidirectional meters compared

These models are suitable for balcony power plants up to 800 watts. They accurately record consumption (register 1.8.x) and feed-in (2.8.x).

Competitive comparison: old vs. new meter

New meters optimize self-consumption to 70-90 percent. They facilitate grid operator communication.

Technical functionality

Bidirectional meters automatically detect the current flow. Sensors measure voltage, current, and direction in real-time. Digital displays show separate values for import and export.

Many models have RS485 or Modbus for apps. Compatible with inverters like Deye SUN600G3-EU-230. Accuracy is class B (1 percent).

Application examples and savings

A tenant with a 600-watt system saves 180 euros annually. The bidirectional meter enables precise billing and 70 percent self-consumption. ROI in 2-3 years.

Families with storage use app data for charging times. Savings of up to 300 euros per year. Landlords in multi-family homes avoid disputes through clear assignment.

Buying guide for meters and systems

Check your meter in advance: Does it have a reverse stop? Does the grid operator require bidirectional metering? Choose VDE-certified models. Combine with energy management for maximum efficiency.

Future trends until 2030

By 2030, all households will receive smart meters. Balcony power plants will integrate into smart grids. Dynamic tariffs and AI optimization will increase savings. Grid operators demand standardized metering.

Frequently Asked Questions

Does every balcony power plant operator need a bidirectional meter?
No, temporarily reverse-running meters are sufficient. However, grid operators recommend bidirectional meters for transparency.

Who bears the installation costs?
The grid operator usually covers them free of charge. Smart meters may incur additional costs.

How long does the replacement take?
2-8 weeks after registration in the market master data register.

Can I retrofit a meter myself?
Yes, plug-and-play models are simple. Have the grid operator check it.

What happens if I register without a bidirectional meter?
Possibly a follow-up registration or rejection. It's better to clarify early.

Sources

• Federal Network Agency: Market Master Data Register (as of 2026)

• VDE: AR-N 4105

• Statista: Digital electricity meter rollout Germany

• Manufacturer information Eastron SDM630-Modbus V3 (Eastron Group)

• EMH eHZ80A (EMH Metering GmbH)

• Orno OR-WE-517 (Orno Polska)

• DRBO Greenenergy product catalog 2026

Some of the information in this article is from the internet. Product specifications may be updated at any time. For the latest information, please visit the official website or product page.