{"id":101695,"date":"2026-09-17T05:32:24","date_gmt":"2026-09-16T20:02:24","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=101695"},"modified":"2026-09-15T08:57:44","modified_gmt":"2026-09-14T23:27:44","slug":"plug-in-solar-has-the-safety-problem-been-solved","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/plug-in-solar-has-the-safety-problem-been-solved\/","title":{"rendered":"Plug-In Solar: Has The Safety Problem Been Solved?"},"content":{"rendered":"

\"Plug-in<\/p>\n

Plug-in solar has moved a step closer in Australia, with federal, state and territory energy ministers agreeing to explore pathways for its safe deployment. The UK now allows approved systems, while New Zealand is also moving towards legalisation.<\/p>\n

But there\u2019s an electrical safety problem SolarQuotes raised when we looked at balcony solar in 2024<\/a>. Two years later, we finally have a much better answer.<\/p>\n

Can Plug-In Solar Overload A Power Circuit?<\/h2>\n

Yes, in theory. But that doesn\u2019t necessarily make it unsafe.<\/p>\n

The problem is where the solar power enters the circuit.<\/p>\n

Imagine a normal Australian power circuit protected by a 20 amp circuit breaker. Plug an 800 watt solar inverter into a powerpoint, and it can supply roughly another 3.5 amps downstream of that breaker.<\/p>\n

Under the right circumstances, a section of cable could therefore carry around 23.5 amps while the circuit breaker sees only 20 amps.<\/p>\n

That was the problem SolarQuotes couldn’t satisfactorily resolve in 2024. If the breaker can\u2019t see all the current flowing through the cable, how can it protect that cable from overload?<\/p>\n

Solar and battery engineer Glen Morris, who sits on the Standards Australia committee responsible for grid-connected inverter standards, confirmed the problem:<\/p>\n

\u201cThe extra current does not disappear. Your 23.5 A worst case on a 20 A circuit is arithmetically correct.\u201d<\/p><\/blockquote>\n

But that\u2019s not the end of the story.<\/p>\n

\"Plug-in

Plug-in solar can add current downstream of the circuit breaker, allowing part of the final sub-circuit to carry more current than the breaker sees.<\/p><\/div>\n

The Overload Risk In Context<\/h2>\n

A 20 amp circuit breaker doesn\u2019t mean the cable becomes unsafe the instant its current reaches 20.1 amps.<\/p>\n

Australian power circuits commonly use 2.5 mm\u00b2 cable protected by a 20 amp breaker (depending on how it is installed). That cable has a current-carrying capacity above the breaker\u2019s rating.<\/p>\n

There\u2019s also a time factor. Overloading damages the cable through heat, so brief periods above the breaker rating are very different from sustained overload.<\/p>\n

Circuit breakers reflect that. Morris points out that a standard breaker must carry 1.13 times its rated current without tripping, while at 1.45 times its rating, it can take up to an hour to trip.<\/p>\n

For that worst-case scenario to actually occur, several things need to happen together:<\/p>\n

    \n
  1. The panels need to be producing strongly.<\/li>\n
  2. The inverter needs to be near maximum output.<\/li>\n
  3. Loads on the circuit need to be high.<\/li>\n
  4. Those loads need to be positioned so the same section of cable carries both the grid and solar current.<\/li>\n<\/ol>\n

    Why Did Germany Set The Limit At 800 Watts?<\/h2>\n

    Germany limits inverter output to 800 VA<\/a>, with up to 960 watts of panels when connected through an ordinary household plug. The panel limit matters too: substantially oversizing the array could keep the inverter pumping out its full output for longer, increasing the risk of overheating.<\/p>\n

    Morris says the German analysis was based on a typical 16 amp circuit using 1.5 mm\u00b2 cable. He compared that with the heavier 2.5 mm\u00b2 cable commonly used on Australian 20 amp power circuits:<\/p>\n

    \u201cOur standard circuit uses heavier cable with a proportionally similar breaker, so 800 W here is, if anything, more conservative than the German case.\u201d<\/p><\/blockquote>\n

    So 800 watts isn\u2019t a magic number that prevents an overload. It limits the inverter\u2019s contribution to around 3.5 amps, with Germany concluding that this was low enough to keep cable heating within acceptable limits.<\/p>\n

    The UK Put Plug-In Solar To The Test<\/h2>\n

    Britain went a step further.<\/p>\n

    Before allowing approved plug-in solar systems, the UK Government commissioned electrical safety testing<\/a> using representative domestic circuits and a range of operating and fault conditions.<\/p>\n

    The testing included what happens when solar adds current to a household circuit downstream of its circuit breaker. It found plug-in systems could operate safely under the conditions tested, with no unacceptable thermal effects.<\/p>\n

    But overload isn\u2019t the only concern. The UK work also examined protective-device operation and shock risks when a system is unplugged or the grid goes down. Those risks can be managed with appropriate inverter and product protections.<\/p>\n

    \"Solar

    Source: Sun Gold Solar<\/p><\/div>\n

    But What About An Old Australian House?<\/h2>\n

    This is where things get less tidy.<\/p>\n

    The thermal headroom argument assumes the existing circuit has enough headroom to begin with.<\/p>\n

    \u201cThe honest caveat is old installations and cables buried in ceiling insulation, where derating eats into that margin,\u201d Morris told SolarQuotes.<\/p><\/blockquote>\n

    That matters because plug-in solar could be particularly useful for renters. They can take a system with them when they move, but have little control over the electrical installation they\u2019re plugging it into.<\/p>\n

    An older installation, or cable affected by thermal insulation or other derating factors, may not have the same margin as an ideal installation.<\/p>\n

    This is one of the questions Australian testing should help answer. Morris is involved in a RACE for 2030 research project with RMIT, UNSW and CSIRO, with trials planned to investigate circuit loading, RCD behaviour and related safety issues under Australian conditions.<\/p>\n

    What Would Australia Have To Change?<\/h2>\n

    Australians can\u2019t legally wander into a shop tomorrow, buy an 800 watt balcony solar kit and plug it into a powerpoint.<\/p>\n

    According to Morris, the main standards barrier is AS\/NZS 4777.1, which governs the installation of grid-connected inverter systems. Current arrangements require the inverter to be permanently connected on a dedicated circuit rather than plugged into an ordinary socket.<\/p>\n

    Legalising plug-in solar would require changes to that standard or a separate installation pathway, along with appropriate product requirements, state electrical safety rules, and a way for distribution networks to know the systems are connected.<\/p>\n

    Victoria is already looking at what would be needed. A parliamentary inquiry<\/a> tabled in August recommended investigating technical standards, safety regulations and a registration scheme for plug-in solar and batteries.<\/p>\n

    New Zealand is also moving ahead. Its government has decided to progress regulatory changes to enable plug-in solar<\/a>, although the detailed technical requirements still need to be worked through.<\/p>\n

    Australia has now taken a national step in the same direction. On 11 September, federal, state, and territory energy ministers agreed to explore pathways for the safe deployment of plug-in solar and other plug-in consumer energy devices. The Commonwealth will work with the states and territories to identify what measures are needed and report back to energy ministers by the end of the year.<\/p>\n

    That doesn\u2019t mean plug-in solar has been given the green light. Morris says there is currently no Standards Australia project underway to amend AS\/NZS 4777.1 for plug-and-socket connections.<\/p>\n

    So, Is Plug-In Solar Safe Enough For Australia?<\/h2>\n

    The electrical problem SolarQuotes raised in 2024 hasn\u2019t disappeared. What\u2019s changed is how that risk can be managed.<\/p>\n

    Germany and Britain have shown that tightly limiting plug-in solar and applying the right technical safeguards can reduce the risk to an acceptable level. The remaining question is whether Australia can apply a similar approach across our own electrical installations, including older and less-than-ideal ones.<\/p>\n

    Australian testing should help answer that. Energy ministers are now looking at a national pathway, but standards and regulatory work will still be needed before plug-in solar becomes a reality here.<\/p>\n

    Morris did offer one possible shortcut:<\/p>\n

    \u201cThen again, the Energy Minister might just wave his magic wand and say \u2018Just Do It!\u2019\u201d<\/p><\/blockquote>\n

    Want to keep up with where plug-in solar goes from here? Sign up for the SolarQuotes newsletter<\/a> for the latest solar, battery and energy news.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Plug-in solar has moved a step closer in Australia, with federal, state and territory energy ministers agreeing to explore pathways for its safe deployment. The UK now allows approved systems, while New Zealand is also moving towards legalisation. But there\u2019s an electrical safety problem SolarQuotes raised when we looked at balcony solar in 2024. Two […]<\/p>\n","protected":false},"author":29,"featured_media":101697,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[46],"tags":[],"class_list":["post-101695","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solar-panels-2","entry"],"acf":[],"yoast_head":"\nPlug-In Solar: Has The Safety Problem Been Solved? - SolarQuotes Blog<\/title>\n<meta name=\"description\" content=\"Germany and the UK now allow plug-in solar under strict safety rules. 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