{"id":71933,"date":"2023-11-30T08:30:36","date_gmt":"2023-11-29T23:00:36","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=71933"},"modified":"2023-11-30T09:28:24","modified_gmt":"2023-11-29T23:58:24","slug":"mc4-plugs","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/mc4-plugs\/","title":{"rendered":"MC4 Plugs, The Hardest Working Things In Solar."},"content":{"rendered":"
\"\"

While they look different, the new model MC4 evo plug on the left is legal to mate with the old MC4 on the right.<\/p><\/div>\n

If you’re not involved in the solar industry but wonder how millions of solar panels worldwide are connected to deliver clean energy, you might have too much spare time on your hands. Nonetheless, I’m glad you’re interested because, as I’m about to explain, this topic can be quite electrifying – particularly when an electrical fire or short circuit causes a catastrophic inverter failure.<\/p>\n

\"\"

BANG. This one went off like a shotgun. When it’s up and running, the capacitors on the Fronius Eco27 are charged with maybe 800 volts DC. Once an errant tek screw pierces the cable in the middle, all that energy gleefully escapes via the short circuit to earth, and a burnt inverter is the upshot.<\/p><\/div>\n

MC3 Connectors: Early Plug And Play<\/h2>\n

Back in the days of yore, when solar panels<\/a> were a quaint 75 watts each, measuring about 500 x 1200mm, and proudly made in Australia; they were all hard-wired. Picture this; actual junction boxes with screwed connectors on the back, from which you ran flexible conduits and then threaded cables between every panel. It took hours and made laying panels flat on the roof impossible.<\/p>\n

Before long, panels were rolling out with leads just over a metre long, allowing those 800 mm wide beauties to be linked up in a daisy chain. Array wiring took a quantum leap with the advent of MC3 connectors that simply pushed together. It was a revelation nearly as astounding as the price of MC3 tools. Two pairs of pliers for a staggering $1500!<\/p>\n

\"\"

MC3. These are a sure sign that your solar panels were expensive when they were new.<\/p><\/div>\n

While some installers would chop them off, crimp on some barrel terminals and apply heat-shrink tubing for insulation, we thought we were pretty special when we took delivery of the gear that let us properly crimp MC3 pins onto our array wiring, AND pull the rubber boots over the pins to finish them.<\/p>\n

\"\"

A non-compatible connector from Jaiwei PV panels with a novel junction box approach to barrel crimps on the array wiring.<\/p><\/div>\n

This was a far cry from watching that one bloke who\u2019d faff around soldering pins. Watching him wear down his molars, chewing on the boots to soften them, then yoinking them on with needle-nose pliers was neither industry best practice nor, in my book, particularly sane.<\/p>\n

Then Came MC4<\/h2>\n

While other styles of plugs came and went, the market soon chose a winner: a new and improved MC3 connector called MC4. Some argue it wasn’t the best plug for the job, but everyone soon became familiar with the feel of barbed plastic pins as they clicked their way into becoming the much-imitated industry standard.<\/p>\n

\"\"

Even the kings of quality from industry membership body Solar Cutters have adopted the MC4 as a logo<\/p><\/div>\n

In fact, the “compatible” MC4 connection became a real problem. With many different makers all trying to avoid patent infringements, the minor differences in plugs and pins meant that while they fitted together mechanically, electrically they didn’t connect properly, and most critically, they didn’t seal out moisture.<\/strong><\/p>\n

\"\"

APS microinverters have one brand of plug, ET solar panels use another, so adapter leads are needed.<\/p><\/div>\n

The result was so many burnt out connections that the next revision of the solar installation standard, AS5033, mandated that only plugs from the same maker could be mated together.<\/strong><\/p><\/blockquote>\n

Mismatched brands were prohibited, and the style seen above with wings was banned because you don’t need a tool to open them. And you don’t want Harry homeowner opening one under load and getting blown off the roof.<\/p>\n

\"\"

L to R, Good examples of MC4s; Jinko, Genuine Staubli MC4 and NBZH<\/p><\/div>\n

How To Terminate MC4 Connectors Properly<\/h2>\n

I have seen MC4 plugs fitted by numpties who aren’t properly equipped with the tools or the brain power to realise they’re a danger to themselves and others. If the cable isn’t retained properly in the plug and it can be pulled out, then there’s a potential to kill someone or burn holes straight through an iron roof.<\/p>\n

\"MC4

Start with your favourite pliers, spanners, MC4 crimpers and a plug to fit.<\/p><\/div>\n

I like to use Lanox as a preservative on my own jobs. It will keep moisture at bay if the plugs are left open overnight. It stops corrosion of the metal contacts and ensures the “o” ring seal slides home easily without binding or curling up.<\/p>\n

\"\"

Some MC4 plugs suit larger cables. The one on the left is what the vast bulk of installs use with 4 & 6mm\u00b2 cable.<\/p><\/div>\n

 <\/p>\n

\"crimping

Crimping the tinned conductors and ensuring the joint is formed properly, hopefully without stray strands like this one.<\/p><\/div>\n

Genuine MC4 spanners will slip before the gland fitting is over-tightened.<\/p>\n

\"MC4

Using the right spanner prevents overtightening. Red arrows show where the gland, which suits larger cable, has been crushed onto a typical 4mm\u00b2 wire.<\/p><\/div>\n

Beware Of Crap MC4 Connectors<\/h2>\n

The very worst plug I’ve struck is this “How Full Star” piece of rubbish. It’s brand new and came out of the box broken, as you see it here. The junction box attached to an equally dubious Luxor solar panel had the same problem with cracked glands. The design is so sloppy it isn’t even compliant as being “touchproof” with a standard test finger.<\/a> These crappy products are the reason we have standards.<\/p>\n

\"\"<\/p>\n

Getting MC4 Connectors Right Really Matters<\/h2>\n

If your solar installer<\/a> is not properly trained or does not take enough care to ensure these small connections are done correctly, you will soon discover that an equally small amount of moisture can bring your entire system to a halt.<\/p>\n

When the inverter detects DC electricity from your array leaking to earth, it will switch off and, by law, send you an email to raise the alarm.<\/p>\n

Join us in the coming weeks as I detail the calamities that lead on from badly fitted and poorly maintained solar power systems.<\/p>\n","protected":false},"excerpt":{"rendered":"

If you’re not involved in the solar industry but wonder how millions of solar panels worldwide are connected to deliver clean energy, you might have too much spare time on your hands. Nonetheless, I’m glad you’re interested because, as I’m about to explain, this topic can be quite electrifying – particularly when an electrical fire […]<\/p>\n","protected":false},"author":28,"featured_media":80307,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[57],"tags":[],"class_list":["post-71933","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solar-installation","entry"],"acf":[],"yoast_head":"\nMC4 Plugs, The Hardest Working Things In Solar<\/title>\n<meta name=\"description\" content=\"MC4 solar panel connectors are a reliable solar system's unseen, critical components. 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Or read on for some of\u2026","rel":"","context":"In "Solar Installation"","block_context":{"text":"Solar Installation","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-installation\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/mc4-header.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/mc4-header.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/mc4-header.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/mc4-header.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/mc4-header.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":57377,"url":"https:\/\/www.solarquotes.com.au\/blog\/solar-analytics-monitoring-mb2293\/","url_meta":{"origin":71933,"position":1},"title":"Should You Get Solar Analytics For Your System?","author":"Michael Bloch","date":"December 29, 2021","format":false,"excerpt":"https:\/\/youtu.be\/cQzkvs6WBdM Finn's a big fan of advanced solar power system monitoring, particularly the Australian-developed Solar Analytics solution. Here's why. Transcript begins -- Finn: For \"Ask Finn\" this month, I'm going to answer a question that I get asked all the time. \"I'm buying a solar system. 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Under the solar panels is where seasoned professionals distinguish themselves, installing systems with a priority on longevity and safety. The hidden solar panel array cabling, often overlooked, speaks volumes about the installer's dedication\u2014or lack\u2026","rel":"","context":"In "Solar Installation"","block_context":{"text":"Solar Installation","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-installation\/"},"img":{"alt_text":"residential solar panels in Australia","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/array-wiring.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/array-wiring.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/array-wiring.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/array-wiring.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/02\/array-wiring.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":91617,"url":"https:\/\/www.solarquotes.com.au\/blog\/shade-happens-when-autumn-shadows-creep-across-your-solar\/","url_meta":{"origin":71933,"position":3},"title":"Shade Happens: When Autumn Shadows Creep Across Your Solar","author":"Anthony Bennett","date":"May 1, 2025","format":false,"excerpt":"As we get deeper into autumn, the days are growing short and the shadows are growing longer \u2014 which is bad news for your solar if a massive palm tree happens to be positioned in the wrong spot. Here's how an array set up in one season can be set\u2026","rel":"","context":"In "Solar Installation"","block_context":{"text":"Solar Installation","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-installation\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/04\/palm-tree-shade-header.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/04\/palm-tree-shade-header.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/04\/palm-tree-shade-header.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/04\/palm-tree-shade-header.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/04\/palm-tree-shade-header.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":79399,"url":"https:\/\/www.solarquotes.com.au\/blog\/rec-alpha-pure-rx\/","url_meta":{"origin":71933,"position":4},"title":"REC Alpha Pure-RX: 470W Of High-Voltage, Low-Current Goodness","author":"Anthony Bennett","date":"October 20, 2023","format":false,"excerpt":"Prominent Singapore-headquartered PV module manufacturer REC has dropped the specifications of its latest line of residential solar panels, the REC Alpha Pure-RX Series. The \"pure\" part of this name refers to the panels being lead-free. Using heterojunction cell technology (HJT), these modules represent yet another significant step in residential solar\u2026","rel":"","context":"In "Solar Panels"","block_context":{"text":"Solar Panels","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-panels-2\/"},"img":{"alt_text":"REC Alpha Pure RX solar panel","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/rec-alpha-pure-rx-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/rec-alpha-pure-rx-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/rec-alpha-pure-rx-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/rec-alpha-pure-rx-1.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/rec-alpha-pure-rx-1.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":80831,"url":"https:\/\/www.solarquotes.com.au\/blog\/are-microinverters-or-optimisers-worth-it\/","url_meta":{"origin":71933,"position":5},"title":"Are Microinverters Or Optimisers Worth It?","author":"Anthony Bennett","date":"January 23, 2024","format":false,"excerpt":"Today I'll explore optimisers and micro inverters, just how they differ from more conventional solar gear, their advantages and their flip side: being complex and more expensive. 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