Balcony power plant: What is allowed? Rules 2026
Introduction
Balcony power plants are booming, but what is actually allowed? 800 W watts or 2.000 W watts? Is permission required? Can the landlord say no? The rules have changed fundamentally 2024. Here you can find the current status for 2026.
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The key rules at a glance
| Topic | Rule 2026 |
|---|---|
| Max. inverter output | 800 W |
| Max. panel output | 2.000 Wp (no legal limit) |
| Registration | Only Marktstammdatenregister |
| Socket | Schuko or Wieland |
| Permission | Not required |
| Landlord approval | Not required (information only) |
| Feed-in tariff | Entitlement exists, but low |
800 W watts vs 2.000 W watts – what applies?
Inverter output: 800 W
The inverter output (AC output) is limited to 800 W watts limited. This is the output that is actually fed into the power grid.
Panel output: no fixed limit
The panel output (DC output, in watts peak) may be higher than 800 W. Systems with 1.600 Wp or even 2.000 Wp panel output are common.
Why? More panel output means the system also gets closer to 800 W in bad weather, with shading or at an unfavourable angle. The inverter automatically limits the feed-in.
Example calculation
| System | Panel output | Inverter | Max. feed-in |
|---|---|---|---|
| 2 panels at 400 Wp each | 800 Wp | 800 W | 800 W |
| 2 panels at 500 Wp each | 1.000 Wp | 800 W | 800 W |
| 4 panels at 400 Wp each | 1.600 Wp | 800 W | 800 W |
Do I need permission?
Building law
No. Balcony power plants up to 800 W inverter output are exempt from approval in all federal states. This is not a structure requiring a permit.
Listed-building protection
Exception: For listed buildings, the Denkmalschutzbehörde may prohibit the installation or impose conditions (e.g. not on the street-facing side). Ask the Bauamt beforehand.
Structural integrity
For roof installation or on the façade: check whether the fastening affects the structure. On a balcony railing this is generally uncritical if the mounting is suitable for the railing.
Tenants and landlords
Since 2024: privileged measure
Solarpaket I has classified balcony power plants as a privileged structural alteration in tenancy law (§ 554 BGB). This means:
- You may install a balcony solar power system
- The landlord cannot refuse without good reason
- You must inform the landlord in writing beforehand
When may the landlord refuse?
Only for objective reasons:
| Reason for refusal | Justified? |
|---|---|
| "Don’t like it" | No |
| Balcony structure not adequate | Yes |
| Denkmalschutz | Yes |
| Fire-safety concerns (substantiated) | Yes |
| Liability concerns (blanket) | No |
| Visual impairment | Only with Denkmalschutz |
What should the letter to the landlord contain?
- Type of system (balcony solar power system, plug-in solar device)
- Output (e.g. 800 W)
- Installation location (balcony, terrace, façade)
- Type of fixing (mounting bracket, no drill holes etc.)
- Removal when moving out
Owners’ association (WEG)
Flat owners, too, have benefited from the privileged status since 2024:
- No WEG resolution needed for the installation
- Informing the property management is recommended
- Exception: If common property is structurally altered (e.g. drill holes in the façade)
Socket: Schuko or Wieland?
Schuko socket (household socket)
- Permitted since 2024 - the standard was amended
- Simplest installation: plug it in, job done
- No electrician needed
Wieland socket (feed-in socket)
- Special socket for solar systems
- Must be installed by an electrician
- Offers additional safety (touch protection)
- No longer mandatory, but still recommended
What happens to the surplus electricity?
Electricity that you do not use yourself is fed into the grid.
Feed-in tariff
- Entitlement: Yes, under EEG
- Amount: Approx. 8 cents/kWh (as at 2026, decreasing)
- In practice: With a 800 W balcony solar power system, that is 20-50 €/year
- Effort: MaStR registration is sufficient
Zero export
Some inverters offer a zero-export function - the electricity is used only for self-consumption. This is technically possible, but not mandatory.
Frequently asked questions
May I mount a balcony solar power system on the garage roof?
Yes. The installation location is not limited to balconies. Roof, garden, terrace, façade or garage roof - all permitted as long as the 800 W limit is complied with.
What happens if I feed in more than 800 W?
Not intended. The inverter automatically limits the feed-in. Using an inverter over 800 W for a balcony solar power system breaches the registration conditions.
Do I need public liability insurance?
Recommended, but not required by law. Most personal liability insurance policies cover balcony solar power systems. Check with your insurer.
Can I use a balcony solar power system in winter?
Yes. The system also generates electricity in winter, although less. On clear winter days, output can even be higher than on hot summer days (solar cells work more efficiently in the cold).
Summary
- 800 W inverter - the legal limit
- Module output may be higher (e.g. 1.600 Wp)
- No permit required
- Landlord cannot refuse (factual reasons only)
- Schuko socket permitted since 2024
- MaStR registration only required
Related Tips
- Register a balcony solar power system: instructions
- Connect a balcony solar power system: instructions
- Apply for balcony solar power system funding
Sources
- Solarpaket I – Bundesgesetzblatt
- BGB § 554 – Structural alterations by tenants
- Bundesnetzagentur – FAQ plug-in solar devices
- VDE – Product standard for plug-in solar devices