The PAS 63100:2024, issued by the BSI in March 2024, outlines that solar batteries should not be installed in voids, roof spaces, or lofts.
This article was kindly contributed by Dave Roberts, UK MD at energy storage specialist GivEnergy. Installations of home battery storage systems are on the rise. Whether coupled with solar PV panels or as a standalone system, battery storage allows homeowners to cut energy bills and carbon emissions.
Should a battery energy storage system be installed on an external wall?
If a battery energy storage system (BESS) is installed on the external wall of a building, it should not compromise the fire performance of the external wall. Service penetrations should be adequately fire-stopped, and internal combustible substrates should not be exposed by the installation.
How will the new British Standard affect home battery storage installations?
The new British Standard for the fire safety of home battery storage installations, which came into force on the 31st March 2024, will have significant impact on how and where new home batteries are installed. PAS 63100:2024: Electrical installations. Protection against fire of battery energy storage systems (BESS) for use in dwellings.
Installing a home battery storage system is the first step towards making your home more energy independent. Home batteries are overwhelmingly safe, especially with the shift towards LiFePO4 battery chemistry. However, enhanced safety shouldn't detract from the need to follow relevant regulations and guidelines when it comes to installation.
However we would still recommend additional protection from direct sunlight and extreme weather situations, a simple lean-to roof above the battery should be more than sufficient. If outdoor installation is not possible, a suitable indoor location should be well ventilated and have suitable fire protection.
Can a home battery storage system be a fire hazard?
Increasingly, home battery storage systems are using lithium iron phosphate (LiFePO4) battery chemistry. LiFePO4 is a type of lithium-ion battery less prone to thermal runaway and therefore, less of a fire risk. With this in mind, it's possible the guidelines around loft installations could change.