This article is based on analysis published by SolarQuotes
Two small reflective labels mounted on a household switchboard could play a far bigger role in electrical safety than many installers realise.
While Australian standards require extensive signage for solar and battery systems, installers are being urged to pay close attention to two specific labels mandated under AS/NZS 5033 and AS/NZS 5139: The green circular ‘PV’ and ‘ES’ stickers installed at the main switchboard.
The labels are designed to provide emergency responders, electricians and homeowners with an immediate indication that a property contains rooftop solar generation or battery energy storage systems before they encounter the equipment itself.
Under AS/NZS 5033:2021 Clause 5.4, solar installations must include a reflective green ‘PV’ sign at least 100mm in diameter positioned on or adjacent to the main switchboard or metering panel. The signage must be clearly visible to approaching emergency personnel.
The label also includes a code identifying the system’s isolation arrangement. ‘AC’ indicates a low-voltage direct current system, typically below 120 volts, while ‘SW’ identifies a load-break switch isolation method and ‘DP’ denotes a disconnection point arrangement commonly used across residential installations.
Battery systems are subject to similar requirements under AS/NZS 5139:2019 Clause 7.3, which mandates a reflective green ‘ES’ sign positioned at the same location.
The ‘ES’ label must also include the battery chemistry’s associated United Nations hazardous goods classification number. For lithium-ion batteries, this is typically UN 3480, while lead-acid and other chemistries carry different identifiers.
These UN numbers align with guidance contained in SAA/SNZ HB 76, which emergency services use to determine appropriate response procedures for hazardous materials incidents.
The distinction is particularly important as different battery chemistries present different operational and safety risks. Lithium-ion thermal runaway events, for example, require significantly different response procedures compared to electrolyte leaks from lead-acid systems.
Unlike warning labels mounted directly on inverters or battery enclosures, the green ‘PV’ and ‘ES’ signs provide early identification of distributed energy resources at the first point of interaction with the electrical installation.
Industry observers say the stickers are sometimes incorrectly mounted directly on battery cabinets or inverter systems rather than at the switchboard, reducing their effectiveness for first responders and service personnel arriving onsite.
With Australia’s installed base of rooftop solar and residential batteries continuing to expand, correctly positioned system identification signage is increasingly being viewed as a simple but important component of long-term electrical and emergency response safety.
