Plug-in solar became legal in Great Britain last Thursday. The week before, New Zealand announced it would follow suit within 12 months. Germany passed the million-unit mark years ago and has now sailed past three million installations.
In Australia, you can buy a plug-in solar kit today. You just can’t legally plug it in.
I sit on the two Standards Australia committees this technology runs into — EL-005, which writes the battery rules, and EL-042, which writes the inverter and solar installation standards. I’ve been in those rooms for fifteen years, so I want to be precise about what’s actually holding this up, because it isn’t what most people assume. The problem isn’t that plug-in solar is unsafe. The problem is that nobody in this country has the authority to say yes.
A tangle of standards
Here’s the knot. Standard AS/NZS 4777.1 treats a grid-connected inverter as part of a building’s fixed wiring, on its own circuit, installed by a licensed electrician. Standard AS/NZS 5033 says the same about solar panels. Standard AS/NZS 3000 treats a power socket as somewhere you draw electricity from, not somewhere you feed it in. And the Clean Energy Council’s approved product list — the list networks and rebate schemes actually rely on — has no category for a plug-connected inverter at all, so a compliant product can’t even get listed.
Above all of that sit eight state and territory electrical safety regulators, each operating under its own Act, and every distribution network running its own connection rules.
None of these bodies can move first. Standards Australia writes standards, but doesn’t legalise anything. The Clean Energy Council can’t list a product that no standard describes. A state regulator won’t approve something the standards don’t permit. And the networks say, reasonably enough, that they’ll connect anything that complies with AS/NZS 4777 and is CEC listed — a door that currently cannot be opened. Everyone is waiting for someone else to move.
The push for action
The fix, as I see it, is for energy ministers to hand the job to the regulators with a firm deadline — exactly what the UK government did. Solar Citizens is now leading a consumer campaign to get plug-in solar regulation onto the agenda when state and territory energy ministers sit down for the next Climate and Energy Ministerial Council meeting on September 11.
The technical hurdles are real, but they’re small, and other countries have already solved them.
Four problems, already solved elsewhere
The first is the socket itself. Unplug a generator and the pins stay live for as long as the inverter keeps producing power. The fix is a requirement that the inverter shut down in well under a second when it loses the socket connection, paired with a plug designed for that purpose. It’s testable, and it’s already being tested overseas.
The second is the circuit. A standard household subcircuit is protected at 16 or 20 amps, and the breaker only sees current arriving from the switchboard end. Inject power halfway along that circuit and, in theory, you could overload the cable without the breaker ever knowing. Germany, and now the UK, solved this by capping output at 800 watts — about 3.5 amps — small enough that it simply can’t overload a normal household circuit. Limit it to one kit per household, and the problem disappears.
The third is anti-islanding — preventing a system from continuing to feed power into a “dead” grid during a blackout — and it’s the easiest of the lot. Australian inverters have managed this for two decades, and there’s a well-established, proven test regime already in place.
The fourth is metering, and this one genuinely is Australia’s own problem to fix. Plenty of apartment blocks still run old accumulation meters and embedded networks that will either spin backwards or bill solar exports as if they were consumption. That’s a metering issue, not a safety one, and it shouldn’t be allowed to hold up everything else.
Then there’s strata and tenancy law, which will lock plenty of people out even once the electrical rules change. Germany dealt with this too, by ruling that landlords and bodies corporate cannot unreasonably refuse a tenant or owner who wants to install one.
The cost of inaction
Meanwhile, the regulatory vacuum is already doing damage. Kits are being sold in Australia right now, and people are quietly plugging them in — with no product specification, no output cap, no testing, and no notification to anyone. Doing nothing is not the cautious option. It’s the option that leaves uncertified hardware wired into Australian homes with no rules governing it at all.