Is plug-in solar safe?

The government’s FAQ puts it this way: “They are used safely overseas, but we have some electrical and grid differences in Australia that we need to manage.” The draft Technical Bridging Standard is the government’s answer to those differences. Some risks it handles with firm rules. Others the consultation paper openly says still need testing. Plug-in solar is not legal in WA yet, and an untested imported kit has none of these protections.

Can a plug-in solar kit start a fire?

Any electrical equipment can, which is why the draft treats fire at “system level” (clause 5.8). That covers the panel, the mounting, the surface it sits on, and the chemistry and placement of any battery. The inverter must minimise fire risk under normal and fault conditions (AS/NZS 62109.1:2026, section 9), and the panels must meet the fire requirements of the IEC 61730 standards.

Placement matters too. Under the draft:

• mounting must not add fire risk, “including by avoiding placing the device near combustible materials” (clause 5.5.1)
• the kit must not compromise fire compartmentation or the performance of external walls under the National Construction Code (clause 5.5.1)
• you are responsible for not increasing the risk of fire spreading along external walls or balconies to neighbours (clause 8.3.2)
• the way panels attach must be “resilient in the event of fire” (clause 6.3)

Could plug-in solar stop my safety switch working?

Possibly, and this is the biggest open question. The consultation paper says: “During a fault, direct current from a plug-in system leaking into a mains circuit can ‘blind’ certain upstream RCDs, preventing them from operating correctly.” A blinded safety switch might not trip when someone gets a shock.

The draft says kits must not impair RCDs, “including blinding during normal or single-fault conditions” (clause 5.7), and adopts the DC leakage rules in AS/NZS 62109.1:2026, clause 7.3.8. But the paper admits that threshold “may not be low enough to prevent blinding of type AC RCDs common in Australian switchboards.” The government considered the UK Government’s lab safety study on plug-in solar when writing this section.

Instead of compulsory home inspections, the paper proposes lab tests to make the kits themselves safe, including:

• DC tests to find where type AC RCDs stop tripping completely
• fault testing on real transformerless plug-in systems
• checking whether the draft’s DC leakage monitoring disconnects fast enough
• whether the EV charger standard (IEC 62955) disconnect rules would be enough
• the combined DC leakage from several appliances and a plug-in system on one circuit
• the effects of plug-in systems on ageing electrical installations

Western Power says type AC RCDs must not be installed in Australia from 30 April 2023, under the Wiring Rules, with type A required instead. Boards fitted out before then may still have type AC units. Your switchboard question is covered in do I need an electrician.

Could it overload a power circuit?

This is the second open question. SolarQuotes explains the concern: a plug-in kit supplies a household circuit in addition to the grid, “potentially allowing more current to flow through sections of wiring than the circuit breaker is designed to protect against.” As I understand it, the circuit breaker in your switchboard only sees the current coming from the grid side, not what the kit adds at the socket.

The draft’s main answer is a hard cap: no more than 800 VA and 3.5 A into the socket (clause 4.1). SolarQuotes says it is “not clear whether this adequately addresses the risk in all existing installations.” The ABC reported that the standard will address how to make sure the devices “don’t overload power circuits.” Other draft rules help limit the risk: one kit per household, no power boards, and guidance on which sockets share a circuit (clause 8.3.3).

Are the plug pins live when I unplug it?

They must not be. A solar kit generates power, so unlike a kettle its plug could carry voltage after you pull it out. The draft deals with this directly (clause 6.2.3.3.3):

• the inverter disconnects within 100 milliseconds of losing mains
• the voltage at the plug pins falls below 34 V within 100 milliseconds
• larger capacitors discharge to 34 V or less within 1 second

A second layer of protection is required in case the first fails: a lock that stops the plug being removed without a tool before the output is off, or a separate electronic cut-out that removes dangerous voltage within 2 seconds (clause 6.2.3.2). Insulation between live parts and the plug pins must be double or reinforced, and still at least basic under a single fault.

Why are extension leads and power boards banned?

The draft says multi-way adaptors, travel adaptors and plug converters “must not be used” (clause 6.2.3.1), and the plug itself must carry a warning against extension cables and multi-way adaptors (clause 8.2.3.2). The consultation paper flags “likely user behaviour, such as using extension cords” as something it wants feedback on (question 12e).

The draft wants the kit plugged straight into a fixed wall socket that complies with the Wiring Rules and is in good condition. My reading of the reason: every extra plug-and-socket joint is another place for heat and a poor contact, and a power board lets the kit share one socket with other loads.

Will the panels blow off a balcony?

The draft aims to stop that. Makers must design mounts so that “foreseeable wind loading does not result in detachment, instability, or falling components capable of injury or damage” (clause 5.5.1), and calculate loads up to wind region B of AS/NZS 1170.2:2021. Unsecured mounts are not permitted. Instructions must give the permitted heights above ground for each mounting type, and how to fasten or ballast for the expected wind (clauses 8.3.1 and 8.3.2).

Cyclone regions C and D, which the paper says cover parts of the Kimberley, Gascoyne and Pilbara, are proposed to be left out of mandatory testing. The paper says “routine storm preparation for other movable fixtures” would apply instead, like bringing in outdoor furniture. Question 6 asks whether a two-tier standard up to region D would be better. For northern towns, see regional WA.

Are plug-in batteries a fire risk?

The draft takes battery fire seriously. The FAQ says it limits batteries to safer chemistries and requires fire and abuse testing. Under the draft:

• only lithium iron phosphate (LFP) or sodium-ion cells; nickel manganese cobalt (NMC) is banned (clause 5.8)
• only new cells, no second-life or reconditioned cells (clause 6.5.1)
• the design must limit thermal runaway spreading from one cell to the next (clause 6.5.2)
• enclosures must be at least UL 94 V-0 flame rated (clause 6.5.2)
• cells must pass short circuit, impact, drop, heat, overcharge, forced discharge and propagation tests (clause 6.5.2)
• vented gas must go away from living spaces, ignition sources and escape routes, and an indoor battery must not vent into the home (clause 6.5.2)
• the battery management system must cut the battery off on its own and default to safe if it fails (clause 6.5.2)
• rated for at least 55°C ambient (clause 6.5.1)

Each battery comes with a safety data sheet linked by a QR code on top of the unit, and a green reflective “ES - Plug in” label for your switchboard showing the UN number of the battery chemistry (clause 6.5.4). My reading is that the label tells anyone working on the switchboard, including emergency services, that a battery is connected. More in plug-in solar batteries.

What about rain and weather?

Outdoor parts, connections and plugs must be rated at least IP55, and indoor parts IP44 (clause 5.4). Cables used outdoors must be weather resistant (clause 6.1). Mounts must resist corrosion, and kits sold for coastal or farm areas must pass salt mist and ammonia tests (clause 5.5.2).