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AS/NZS 5139-2019
Why Lithium Batteries Need Their Own Standard
Lead-acid battery standards (AS 3011, AS 4086) were developed in the 1990s for flooded and sealed lead-acid chemistry. Lithium-ion batteries — including the now-dominant LiFePO4 chemistry — present different hazards: thermal runaway, off-gassing of flammable and toxic gases, and the ability to reignite hours after a fire appears extinguished. AS/NZS 5139, released in 2019, is the Australian standard specifically addressing Battery Energy Storage Systems (BESS) and is now the primary compliance reference for residential and commercial lithium battery installations.
Key AS/NZS 5139 Requirements
Category | Requirement |
|---|---|
Separation from living areas | BESS must not be installed in a bedroom, bathroom, or room that is the only exit from the dwelling |
Separation from hazards | Minimum 600 mm clearance from gas meters, hot water systems, and other ignition sources |
Fire separation (attached garages) | BESS must be on the external wall of a garage attached to the house, or in a structure separated by a fire-rated wall |
Ventilation | Battery enclosure must not be airtight — allow for gas dispersal in the event of a cell venting |
Battery management system (BMS) | Mandatory — must provide cell-level voltage monitoring, temperature monitoring, and overcurrent protection |
Labelling | Battery enclosure must display chemistry type, voltage, energy capacity, and emergency contact number |
Where Can a Lithium BESS Be Installed?
Location | Permitted? | Conditions |
|---|---|---|
Garage (detached) | Yes | On exterior wall; not near vehicle fuel storage |
Garage (attached to house) | Yes | On exterior wall or fire-rated wall; not near entrance to house |
Internal room (non-habitable) | Yes | Ventilated; separated from sleeping areas by fire-rated construction |
External wall mount | Yes (preferred) | IP rating appropriate for weather; cable penetrations sealed |
Bedroom or sole egress corridor | No | Prohibited absolutely |
Engr. Jason Morales — Founder, SolarEnergyPH
