Do balcony power plants with storage burn? All risks & safe installation locations 2026

Fire Safety for Balcony Power Plants: How Safe are Mini Solar Systems and Storage Units Really? – The Ultimate Safety Guide

Balcony power plants are experiencing an unprecedented boom in Germany. Since their legal classification as a "privileged measure" in 2024 and the simplifications introduced by Solar Package I, more and more tenants and homeowners are taking advantage of the opportunity to generate their own green electricity on their balcony, terrace, or garage roof. However, with increasing widespread use, questions about safety are also growing: What about fire protection for balcony power plants? What risks do modern lithium-ion storage units pose, and how should one react in an emergency?

This guide illuminates all fire protection aspects in a scientifically sound and practical way, so you can operate your mini solar system absolutely safely.

How safe are balcony power plants really?

The short answer is: Extremely safe. High-quality balcony power plants approved in Germany statistically show a negligible fire risk. According to the Federal Association of Fire Protection Companies (bvbf) and testing organizations such as TÜV Süd, fires directly caused by solar modules or certified inverters are absolute isolated cases.

The risk is almost never due to the solar technology itself, but to the following external factors:

• Poor installation: Loose plug connections or pinched cables.

• Outdated household grid installations: Overload of old circuits without adequate protection.

• Fake or uncertified imported goods: Components without a valid CE mark or TÜV certificate.

Modern inverters have integrated grid and system protection (NA-Schutz). This switches off the inverter in milliseconds as soon as the plug is pulled from the socket or a power outage occurs in the household grid. This ensures that there is no life-threatening voltage on the pins of the Schuko or Wieland plug.

Safety Clearances and Installation Location: Actively Preventing Fires

Careful installation is the best fire prevention. When choosing the installation location and routing cables, you should observe fixed safety clearances to avoid heat build-up and mechanical stress:

• Distance to combustible materials: Maintain at least 30 to 50 cm distance from combustible objects such as wooden fences, fabric awnings, stored paper, or dry balcony plantings.

• Rear ventilation of modules: Mount the solar modules with a minimum distance of 5 to 10 cm from the wall or railing. This circulation layer ensures that the modules are cooled by the wind, which not only minimizes the risk of fire but also keeps the efficiency of the solar cells high.

• Cable routing: Never bend cables or run them over sharp edges (e.g., on the balcony railing). Use UV-resistant cable ties and, if necessary, fireproof cable ducts made of metal or special fire protection plastic.

Balcony Power Plant Storage: Fire Protection and the Right Installation Location

More and more households are equipping their balcony power plants with a battery storage unit (mostly lithium iron phosphate, or LiFePO4) to use the generated electricity in the evening. Although LiFePO4 cells are considered significantly safer and more thermally stable than conventional lithium-ion batteries (as used in smartphones), fire protection for PV storage units requires special attention.

Particularly in 2026, the topic is highly current, as large housing associations like Vonovia are increasingly issuing blanket bans on balcony storage units. They refer to the lack of a specific product standard for plug-in battery storage units (while for the pure balcony power plants, the DIN VDE V 0126-95 standard has applied since the end of 2025). It is all the more important to take maximum safety precautions when setting up.

Installing balcony power plant storage outdoors

The balcony or terrace is the standard installation location. Pay close attention to the protection class (at least IP65), which protects the storage unit against dust and jet water.

Important: Even weatherproof storage units must never be exposed to direct, scorching midday sun. Use shady niches, install a small canopy, or use a special balcony power plant storage insulation box. These boxes protect against extreme heat in summer and frost in winter, as many batteries may not be charged below 0 °C to avoid cell damage.

PV Storage Installation Location: Garage vs. Attic

PV storage fire protection cabinet

For maximum safety indoors (e.g., in the cellar or hallway), a certified PV storage fire protection cabinet is recommended. These special cabinets offer a fire resistance class of at least F30 (30 minutes of protection against fire transfer to the outside) or even F60/F90. They have integrated ventilation openings with thermal valves that automatically close in case of fire to force oxygen deprivation and filter smoke gases.

Can the modules overheat and catch fire in summer?

It is a widespread myth that solar modules can spontaneously catch fire in extreme summer heat. High-quality solar modules consist of hardened safety glass on the front and are extremely resistant. Even safer are so-called glass-glass modules, which also have a glass pane on the back instead of a plastic film. They are considered almost incombustible.

Although the efficiency of the modules decreases at very high temperatures (due to the so-called temperature coefficient), overheating to the point of ignition is physically impossible with professional installation (rear ventilation!). Danger only arises with so-called hotspots. These occur when individual cells are permanently shaded (e.g., by leaves or bird droppings) or there are hairline cracks in the silicon. The current then flows through the shaded cell as through a resistor, leading to localized heat development.

• Prevention: Regularly clean your modules of coarse dirt and visually check them for cracks.

Behavior in case of fire: What to do if there is a fire?

Should a fire occur on the system or in its immediate vicinity, contrary to expectations, the golden rule of fire protection applies: Self-protection always takes precedence over property protection!

Do I need a special fire extinguisher?

For private households with a balcony power plant, a conventional ABC powder extinguisher or a foam extinguisher (suitable for fire classes A and B, and for electrical installations under 1000 volts, maintaining a safe distance) is absolutely sufficient.

However, if you operate a battery storage unit, you should consider purchasing a special fire extinguisher for lithium-ion battery fires. These extinguishers often use special extinguishing agents such as gel extinguishing agents or F-500 Encapsulator Agent. They cool the burning battery extremely quickly and interrupt the chemical chain reaction inside the cells (the so-called thermal runaway), which is very difficult to achieve with normal water or standard extinguishing powder.

What does the landlord say about fire protection?

Since the care reform in autumn 2024, the balcony power plant has been enshrined in the Apartment Ownership Act (WEG) and the Civil Code (§ 554 BGB) as a privileged measure. This means that landlords and homeowners' associations can no longer generally prohibit the installation of a balcony power plant.

However, they may impose objective and justified conditions on installation and fire protection:

1. Professional installation: The landlord may demand that the system be installed according to recognized technical standards.

2. Safety-relevant requirements: The obligation to use certified mounts and wind and fire-resistant components is absolutely legitimate.

3. The storage debate: As recent developments in 2026 show, large landlords are using the current regulatory gap for plug-in storage units to prohibit them in rental apartments for fire safety reasons. If you wish to install a storage unit, it is strongly recommended that you obtain the landlord's written consent beforehand and point out the use of safe LiFePO4 technology and certified outdoor installation locations.

FAQ – Frequently Asked Questions

1. Does a balcony power plant increase the risk of lightning strikes?

No. Installing a balcony power plant on the balcony railing or terrace does not increase the risk of a lightning strike to the building. Lightning preferentially strikes the highest points in an area. Since balconies are generally lower than the roof of the building (which usually already has a lightning protection system), the physical probability of a strike does not change.