If you work in solar PV, battery storage, retrofit, electrical installation, PAS63100:2024 domestic battery storage compliance has become one of the most important topics in the industry.
The introduction of PAS 63100:2024 and BS 7671:2018+A4:2026 introduces significant new requirements designed to improve fire safety, reduce risk and ensure Battery Energy Storage Systems, commonly known as BESS, are installed safely within domestic properties.
As battery technology becomes increasingly popular alongside solar PV systems, installers, landlords, housing providers and homeowners need to understand exactly what is required to achieve domestic battery storage compliance.
What Is PAS 63100:2024 domestic battery storage?
PAS63100:2024 Domestic Battery Storage is a specification developed to improve fire safety in domestic battery energy storage systems. The standard sets out requirements covering battery installation, fire protection, battery management systems, monitoring, ventilation, warning notices and verification procedures.
The document works alongside BS 7671 and applies to Battery Energy Storage Systems installed in domestic dwellings. Its aim is to minimise the risk of battery fires and reduce the impact should a battery-related fire occur.
Why Domestic Battery Storage Compliance Matters
Battery storage systems contain significant amounts of stored energy and are increasingly being installed in homes to maximise solar PV generation, reduce electricity costs and improve energy independence.
Whilst battery fires remain uncommon, they can be severe when they occur. PAS 63100 adopts a precautionary approach by introducing strict requirements around battery location, fire separation, ventilation and monitoring.
For anyone involved with battery storage, understanding domestic battery storage compliance is now essential
Where Batteries Can and Cannot Be Installed
One of the most significant aspects of PAS 63100 is the restriction on installation locations. Batteries must not be installed in:
- Bedrooms or rooms intended for sleeping
- Staircases, hallways and unprotected escape routes.
- Protected escape routes and firefighting staircases.
- Cupboards opening into bedrooms.
- Lofts, roof spaces and voids.
- Basements without direct access to the outside.
- Within two metres of flammable materials or fuel storage.
- Within one metre of doors, windows, escape routes or ventilation openings when installed externally.
The prohibition on loft installations will likely affect many future battery storage designs and retrofit projects.
Maximum Battery Storage Capacity
Another key element of PAS63100:2024 Domestic Battery Storage compliance is the introduction of maximum stored energy limits
- 80 kWh when installed outdoors, within detached outbuildings or within suitably fire-separated garages and outbuildings.
- 40 kWh in all other installation scenarios.
These limits mean battery sizing must now be considered alongside installation location and fire safety requirements. For many future projects, battery placement may determine whether larger storage capacities are permitted.
Fire Safety Requirements for PAS63100:2024 domestic battery storage
A key principle of PAS63100:2024 Domestic Battery Storage, is that batteries should be installed outdoors wherever practical. Where indoor installation is necessary, several additional fire safety measures apply:
- Fire-resisting separation may be required between the battery location and occupied areas
- Fresh air ventilation must be provided to external areas.
- Fire stopping should be provided around service penetrations where necessary.
- Fire detection systems may be required.
These measures are intended to protect occupants and maintain safe means of escape should a battery fault develop.
Fire Alarm Requirements for PAS63100:2024 domestic battery storage
Another important aspect of PAS63100:2024 domestic battery storage compliance concerns fire detection.
Where batteries are installed in infrequently visited areas such as store cupboards or plant rooms, smoke alarms or multi-sensor fire detectors must be installed and linked to the wider fire alarm system within the dwelling.
Similarly, inverters and DC-to-DC converters installed in loft spaces, store cupboards or other infrequently visited locations also require interlinked fire detection systems. This ensures occupants receive an early warning should a fire develop.
Battery Enclosures and Access Requirements
Battery safety extends beyond location alone. PAS 63100 requires battery enclosures to:
- Be constructed from non-combustible materials.
- Be accessible only by the use of a tool.
- Provide suitable mechanical protection where required.
The standard specifically aims to prevent accidental access and reduce the risk of electrical faults and fire.
Arc Flash Risk Assessment
One of the most interesting requirements within PAS 63100 involves arc flash assessment.
Battery manufacturers are required to assess arc flash, fire and explosion risks and declare arc flash incident energy within installation documentation.
This information influences installation location requirements, enclosure specification, fire resistance requirements, and safety warnings and notices. As battery systems increase in size, arc flash considerations will become increasingly important.
Battery Management and Monitoring Systems
Every BESS installation must include a Battery Management and Monitoring System, known as a BMMS.
The BMMS is responsible for monitoring battery health and identifying dangerous operating conditions. The system must provide monitoring and management functions, visual warnings for dangerous conditions, and audible warnings where appropriate.
For external installations, remote monitoring via mobile applications may be acceptable. This is another critical component of PAS 63100:2024 domestic battery storage compliance.
Mechanical Impact Protection to PAS 63100:2024 Domestic Battery Storage
Battery storage systems installed near vehicles or parking areas require protection against mechanical damage.
Installations in garages and similar locations require impact protection meeting relevant standards or equivalent physical protection measures. Battery safety is not just about electrical and fire risks. Physical protection is also an important consideration
Documentation and Compliance Requirements
One area often overlooked is the amount of documentation now required. PAS 63100 requires installers to provide:
- Installation notices and warning labels.
- User instructions.
- Operational procedures.
- Emergency procedures.
- Verification documentation.
- PAS 63100 checklists.
- Statements of conformity.
These documents are essential for demonstrating compliance and supporting future maintenance and inspections.
The Future of PAS63100:2024 Domestic Battery Storage Compliance
The rapid growth of domestic battery storage means that compliance requirements will continue to evolve. PAS 63100:2024 Domestic Battery Storage and BS 7671 Amendment 4 demonstrate that battery systems are now considered safety-critical installations requiring careful planning, competent installation and robust verification.
The new rules surrounding battery location, capacity limits, fire detection, ventilation, arc flash assessments, battery management systems and compliance documentation show just how important PAS63100:2024 domestic battery storage compliance has become.
Whether you are an installer, housing provider, landlord or homeowner, understanding PAS63100:2024 domestic battery storage compliance will be essential for delivering safe, compliant and future-proof Battery Energy Storage Systems.
For more information to ensure your designs, specifications and installations are compliant, email us at hello@netzerogurus.co.uk and we will help you out.
