Balcony Power Plant: What Is Allowed? Rules 2026

Introduction

Balcony power plants (Balkonkraftwerke) are booming – but what is actually allowed? 800 watts or 2,000 watts? Do I need a permit? Can my landlord say no? The rules changed fundamentally in 2024. Here you will find the current status for 2026.

The Most Important Rules at a Glance

Topic	Rule 2026
Max. inverter power	800 W
Max. module power	2,000 Wp (no legal limit)
Registration	Only Marktstammdatenregister (Market Master Data Register)
Outlet	Schuko or Wieland
Permit	Not required
Landlord's consent	Not required (only notification)
Feed-in tariff	Entitlement exists, but amount is small

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800 Watts vs. 2,000 Watts – What Applies?

Inverter Power: 800 W

The inverter power (AC power) is limited to 800 watts. This is the power that is actually fed into the electrical grid.

Module Power: No Fixed Limit

The module power (DC power, in watt peak) may be higher than 800 W. Systems with 1,600 Wp or even 2,000 Wp module power are common.

Why? More module power means the system comes closer to 800 W even in bad weather, partial shading, or unfavorable angles. The inverter automatically limits the feed-in.

Calculation Example

System	Module Power	Inverter	Max. Feed-in
2 modules at 400 Wp	800 Wp	800 W	800 W
2 modules at 500 Wp	1,000 Wp	800 W	800 W
4 modules at 400 Wp	1,600 Wp	800 W	800 W

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Do I Need a Permit?

Building Law

No. Balcony power plants up to 800 W inverter power are permit-free in all federal states. They do not constitute a building structure requiring a permit.

Listed Building Protection

Exception: For listed buildings (Denkmalschutz), the heritage authority may prohibit the installation or impose conditions (e.g., not on the street-facing side). Ask the local building authority (Bauamt) beforehand.

Structural Integrity

For roof mounting or facade installation: Check whether the fastening affects the structural integrity. On a balcony railing, this is generally not an issue if the bracket is suitable for the railing.

Tenants and Landlords

Since 2024: Privileged Measure

The Solarpaket I (Solar Package I) classified balcony power plants as a privileged structural modification under tenancy law (BGB Section 554). This means:

You may install a balcony power plant
The landlord cannot refuse without justification
You must inform the landlord in writing beforehand

When Can the Landlord Refuse?

Only for objective reasons:

Reason for Refusal	Justified?
"I don't like it"	No
Insufficient structural integrity of the balcony	Yes
Listed building protection	Yes
Fire safety concerns (substantiated)	Yes
Liability concerns (general)	No
Visual impairment	Only for listed buildings

### What Should Be Included in the Letter to the Landlord?

Type of system (balcony power plant, plug-in solar device)
Power output (e.g., 800 W)
Mounting location (balcony, terrace, facade)
Type of fastening (bracket, no drill holes, etc.)
Removal upon moving out

Homeowners' Association (WEG)

Condominium owners also benefit from the privileged status since 2024:

No WEG resolution required for the installation
Notification of the property management recommended
Exception: When common property is structurally altered (e.g., drill holes in the facade)

Outlet: Schuko or Wieland?

Schuko Outlet (household outlet)

Permitted since 2024 – the standard was updated
Simplest installation: plug in and done
No electrician needed

Wieland Outlet (feed-in outlet)

Specialized outlet for solar systems
Must be installed by an electrician
Provides additional safety (contact protection)
No longer mandatory, but still recommended

What Happens with Excess Electricity?

Electricity that you do not consume yourself is fed into the grid.

Feed-in Tariff

Entitlement: Yes, under the EEG (Renewable Energy Sources Act)
Amount: Approx. 8 cents/kWh (as of 2026, declining)
In practice: For an 800 W balcony power plant, this amounts to 20–50 EUR/year
Effort: MaStR registration is sufficient

Zero Feed-in

Some inverters offer a zero feed-in function – electricity is used only for self-consumption. This is technically possible but not required.

Frequently Asked Questions

Can I mount a balcony power plant on a garage roof?

Yes. The mounting location is not limited to balconies. Roof, garden, terrace, facade, or garage roof – all permitted, as long as the 800 W limit is observed.

What happens if I feed in more than 800 W?

Not possible by design. The inverter automatically limits the feed-in. Using an inverter above 800 W for a balcony power plant violates the registration conditions.

Do I need liability insurance?

Recommended, but not legally required. Most personal liability insurance policies cover balcony power plants. Check with your insurance provider.

Can I use a balcony power plant in winter?

Yes. The system also produces electricity in winter, although less. On clear winter days, output can actually be higher than on hot summer days (solar cells work more efficiently in cold temperatures).

Summary

800 W inverter – the legal limit
Module power may be higher (e.g., 1,600 Wp)
No permit required
Landlord cannot refuse (only objective reasons)
Schuko outlet permitted since 2024
Only MaStR registration required