Battery storage fire and explosion at a house in Mank
Sept 2026Published 29 Sept 2026Responsible editor: Chief Editor
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What happened
On 15 September 2026, at about 20:30, a basement fire was reported at a house in Mank, in the district of Melk, Austria. The object involved was the energy storage of a photovoltaic installation, with a reported capacity of about 27 kWh and about 4,000 lithium-ion 18650 cells. It stood in a fire-protection room that had formerly been an oil store and was hard for the fire service to reach.
At about 20:50 explosions were heard inside the house. The breathing-apparatus team left at once. Fire service equipment was damaged, and one firefighter was lightly injured in the face. A second firefighter was taken for examination. Three residents were outside; two were given first aid and taken for checks, and all three were ultimately uninjured. The fire service flooded the store with water to cool the cells and stop the smoke, and reported that the cells were extinguished.
At about 22:50 the property was closed on building-authority grounds by the fire incident commander and then, verbally, by the mayor of Mank. At 22:53 the EVN fault service isolated the electricity supply. Damage was reported in the six-figure euro range.
Contributing factors
Police fire investigation reported that energy from the photovoltaic installation apparently overheated the cells because of a technical defect in the relevant fuses, and that a chemical reaction in the cells may then have occurred. The report also said that a self-built store above 20 kWh must be checked by a licensed electrical contractor under Lower Austria building rules, and that this had apparently not been done. These points are the investigators' findings from a single police report, not an independent conclusion.
Lessons learned
- A domestic battery store above the local inspection threshold should be checked by a licensed electrical contractor before it is used.
- A store that is hard to reach, including a converted oil room, can delay crews and raise the risk if cells vent or explode.
- Responders should expect possible cell explosions, confirm electrical isolation, and plan access and cooling before entering a domestic battery room.
More lessons on worker safety and safe systems of work, electrical protection and isolation, from every incident on the register.
Source
Published 2026-09-29. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.
