{"id":87470,"date":"2024-11-14T12:47:17","date_gmt":"2024-11-14T03:17:17","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=87470"},"modified":"2025-12-19T14:44:41","modified_gmt":"2025-12-19T05:14:41","slug":"sungrows-snafu-solved","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/sungrows-snafu-solved\/","title":{"rendered":"Solved: The Voltage Mismatch Causing Sungrow Inverters to Drop Power"},"content":{"rendered":"

\"Solar<\/p>\n

Like any complex modern technology, solar inverters often have flaws. In this post, I’ll explore one of the most curious problems I’ve seen in recent years. Thanks go to Sungrow for keeping my job interesting…<\/p>\n

In my experience, Sungrow inverters<\/a> are adaptable, powerful, and reasonably priced with great Australian support.<\/p>\n

The hardware is solid1<\/a><\/sup> so I’m surprised they have a fairly widespread technical problem.<\/p>\n

What’s Going On?<\/h2>\n

In some cases, Sungrow’s 4 MPPT single-phase inverters can’t handle the string configurations they’re rated for.<\/p>\n

While they still work, I have seen firsthand a system yielding only 150 watts when it should be pumping out 5000 watts or more.<\/p>\n

I’ve noticed this before with a vintage Xantrex inverter that would “start-up” and turn the green light on but never generate properly. In that instance, it had to be replaced with an SMA that had quite different input specifications.<\/p>\n

It can happen to any manufacturer. This just happens to be Sungrow’s turn in the spotlight.<\/p>\n

\"xantrex

The lights were on, but nobody was home. Xantrex couldn’t cope with an array producing a maximum of 220VDC, and the peak power input of 180VDC was too low.<\/p><\/div>\n

Of All The Gin Joints…<\/h2>\n

Let’s face it: If you were going to sell a new model line, you really wouldn’t want the General Manager of SolarQuotes to do beta testing in his own house. You could say it’s pretty embarrassing, but I prefer to look at it like this: What better way to prove your problem-solving prowess?<\/p>\n

Trev, our GM, isn’t an electrician, but he’s technically savvy. He bought his new Sungrow SH10RS hybrid from a well-regarded business, and I’m comfortable saying the owner and electrician, Joe Deionno, is one of the sharper knives in the drawer. Joe’s experience ensured there wasn’t an installation or electrical design problem; everything was within the recommendations.<\/p>\n

\"Sungrow

String D with 7 panels. At maximum power, there’s a 180-volt difference to string A<\/p><\/div>\n

Sungrow Specifications are Impressive<\/h2>\n

Sungrow and many others have been kicking goals with 5kW hybrids offering a handy 27 amps (120%) surge capacity on the backup circuit. In an outage, this allows you to run your fridge and lights comfortably and even manage some luxuries like a small split system air conditioner<\/a>.<\/p>\n

The new 8 & 10kW (SH8.0RS and SH10RS<\/a>) single-phase hybrids are a significant step forward. At nearly 60 amps surge capacity and up to 45 amps continuous, they’re designed to offer “whole-home” backup.<\/p>\n

The inverter carries all the power to and from the grid2<\/a><\/sup> It makes the installation wiring straightforward, but that simplicity cuts both ways. If the inverter fails, you have no power, so Sungrow supply them with a bypass switch.<\/a><\/p>\n

It’s something we highly recommend for any series hybrid<\/em> inverter. If the hybrid inverter fails, with a flick of a switch you, your tenants or guests can restore mains power and avoid emergency callout fees for a temporary switchboard rewiring job.<\/a><\/p>\n

\"Sungrow

String D is now 9 panels. At maximum power that’s only 150 volts different to string A<\/p><\/div>\n

There’s Been Some Confusion<\/h2>\n

For Trev’s place, there were a few months of maddening symptoms. Inconsistent faults are the worst. The firmware was updated, the wiring was checked, the battery was inspected, the inverter was replaced, and the monitoring was interrogated again and again.<\/p>\n

Voltages were measured, SAPN (the electricity network people) were harassed about their external export controls. Even though the system had a dumb 5kW limit, it was moved to the new flexible exports just to see if that changed something, and it didn’t.<\/p>\n

The disappointment became palpable with each round of phone calls and installer appointments. A battery cell with an early-life failure under warranty confused matters. In retrospect, Trev says the support was great.<\/p>\n

An Interesting Development<\/h2>\n

At the same time as Trev’s woes, Sungrow tech support made a post on Facebook to alert installers of a potential problem. Subsequently, there were some dirty deletes, wild rumours and innuendo, culminating in an official explainer from a most senior technical engineer:<\/p>\n

Hi Installers, Please be noted that, for SH8\/10RS, the different MPPT<\/a>s need to be within 150V.<\/p><\/blockquote>\n

This was the problem with Trev’s system.\u00a0 By moving two panels from one side of his house to the other, his string voltages were better balanced (within 150V), and the problem hasn’t resurfaced.<\/p>\n

Sungrow gave a further, official explanation on Facebook:<\/p>\n

UPDATED: Yesterday night, we organized an emergency technical meeting with Sungrow’s product team, now we can confirm that SH8.0RS and SH10RS have 4 real independent MPPTs, but, under some extreme conditions, the inverter could reduce solar production.<\/p><\/blockquote>\n

This Probably Looks A Bit Unseemly<\/h2>\n

Social media has become ubiquitous, forming the backbone of technical information and product awareness for many solar manufacturers in Australia. To be honest, I feel a bit awkward airing the dirty laundry, so I hope Sungrow isn’t mad at me. We’re demonstrating a culture that helps everyone by being well-engaged and super-responsive. Good manufacturers have\u00a0 a brand and a community, too.<\/p>\n

The take away is the message that Sungrow offers great support for their installers, which means end users should have the best overall experience.<\/strong><\/p>\n

\"Sungrow

Those who just look over the promotional flyer can still be misled if you miss the asterisks and fine print on the next page. ** Please refer to the user manual for the full load MPPT voltage range<\/em><\/strong><\/p><\/div>\n

\u00a0<\/strong><\/p><\/blockquote>\n

The Solution; Designing For Rated Power<\/em><\/h2>\n

While the operating specs are very broad, technical support now states<\/a> designs should stick to the “MPP voltage range for rated power”<\/p>\n

190 – 480v are the magic numbers (a 290 volt window) because, to quote Allen Ding from Sungrow,<\/p>\n

“160v on one string and 530v on another is too much difference”<\/p><\/blockquote>\n

\"Solar

Trev’s solar output would sometimes drop like a stone and stay low for hours.<\/p><\/div>\n

Innovation Continues<\/h2>\n

Now installers are aware, it’s not a huge issue, but it has spurred further development in the industry.<\/p>\n

Designers and salespeople rely on software to place panels and form electrical layouts. Most use maximum open circuit voltage as a ceiling. With a particular panel at your address, uprated for low temperature, the programs will flag a design that exceeds 600 or 1000VDC.<\/p>\n

I’m happy to report\u00a0that, as a direct result of “the Sungrow situation,” our friends at solar design software SolarPlus<\/a> are working out an option for\u00a0nominal<\/em>\u00a0design voltage<\/em> instead of just a maximum ceiling figure. So,<\/span>\u00a0all installers using all brands will be able to stipulate whether they want peak efficiency or peak capacity when designing.<\/p>\n

\"Solar

Once the string voltages were sorted out, Trev’s system has been cracking along<\/p><\/div>\n

Quality Is Important, Support Is Supreme<\/h2>\n

At the end of the day, customer satisfaction can only be guaranteed by good service. You just don’t get it with crazy-cheap systems, especially those flogged by flimsy sales companies and spruiked by washed-up sports ball players on TV.<\/p>\n

Not every solar power system is plain sailing. Trev has had a textbook case of new system difficulties but an even better example of stellar support.<\/p>\n","protected":false},"excerpt":{"rendered":"

Like any complex modern technology, solar inverters often have flaws. In this post, I’ll explore one of the most curious problems I’ve seen in recent years. Thanks go to Sungrow for keeping my job interesting…<\/p>\n","protected":false},"author":28,"featured_media":87942,"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":[48],"tags":[],"class_list":["post-87470","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solar-inverters","entry"],"acf":[],"yoast_head":"\nSolved: Voltage Mismatch Causes Sungrow Inverters Power Drop<\/title>\n<meta name=\"description\" content=\"How voltage mismatch can impact Sungrow inverter performance and what steps your installer can take to keep your energy yield high.\" \/>\n<meta name=\"robots\" content=\"index, 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He\u2019s a licensed electrician, builder, roofer and solar installer who for 14 years did jobs all over SA - residential, commercial, on-grid and off-grid. A true enthusiast with a skillset the typical solar installer might not have, his blogs are typically deep dives that draw on his decades of experience in the industry to educate and entertain. Read Anthony's full bio.","url":"https:\/\/www.solarquotes.com.au\/blog\/author\/anthony\/"}]}},"jetpack_featured_media_url":"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/11\/sungrow-design-header.jpg","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2FF2s-mKO","jetpack-related-posts":[{"id":89207,"url":"https:\/\/www.solarquotes.com.au\/blog\/best-solar-inverters-2025\/","url_meta":{"origin":87470,"position":0},"title":"The Best Solar Inverters In 2025: According To Aussie Installers","author":"Finn Peacock","date":"February 3, 2025","format":false,"excerpt":"The beating heart of any solar system is its inverter, and nobody knows them better than the experts who work with them daily. It's time to announce the winners of the 2025 SolarQuotes Installers' Choice Awards for Best Solar Inverters. How Did We Survey Our Installers? At the time of\u2026","rel":"","context":"In "Solar Inverters"","block_context":{"text":"Solar Inverters","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-inverters\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/installers-choice-inverters-2025.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/installers-choice-inverters-2025.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/installers-choice-inverters-2025.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/installers-choice-inverters-2025.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/installers-choice-inverters-2025.png?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":71412,"url":"https:\/\/www.solarquotes.com.au\/blog\/sungrow-inverters-deep-dive\/","url_meta":{"origin":87470,"position":1},"title":"A Deep Dive Into Sungrow Solar Inverters","author":"Ronald Brakels","date":"March 9, 2023","format":false,"excerpt":"Sungrow is either the largest or second-largest solar inverter manufacturer in the world.\u00a0 They're duking it out with Huawei, and it isn't clear who's winning.\u00a0 Sungrow has a range of residential inverters we consider reliable and well-supported in Australia, and are one of the dozen manufacturers we recommend using.\u00a0 This\u2026","rel":"","context":"In "Solar Inverters"","block_context":{"text":"Solar Inverters","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-inverters\/"},"img":{"alt_text":"An in-depth look at Sungrow solar inverters","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/sungrow-specs-dive.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/sungrow-specs-dive.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/sungrow-specs-dive.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/sungrow-specs-dive.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/03\/sungrow-specs-dive.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":21050,"url":"https:\/\/www.solarquotes.com.au\/blog\/sungrow-inverter-factory-bangalore-mb0562\/","url_meta":{"origin":87470,"position":2},"title":"Sungrow To Start Manufacturing Solar Inverters In India Soon","author":"Michael Bloch","date":"April 26, 2018","format":false,"excerpt":"Chinese solar inverter manufacturer Sungrow has announced its first factory outside of China will be up and running in the second half of this year. The factory, located in Bangalore, India, will have an annual string and central inverter production capacity of 3 gigawatts. \"Sungrow is always committed to optimizing\u2026","rel":"","context":"In "General Solar & Storage News"","block_context":{"text":"General Solar & Storage News","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-battery-news\/"},"img":{"alt_text":"Sungrow solar inverter factory","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/04\/sungrow-inverter-factory.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/04\/sungrow-inverter-factory.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/04\/sungrow-inverter-factory.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/04\/sungrow-inverter-factory.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":82416,"url":"https:\/\/www.solarquotes.com.au\/blog\/best-solar-inverters-2024\/","url_meta":{"origin":87470,"position":3},"title":"The Best Solar Inverters In 2024: According To Aussie Installers","author":"Finn Peacock","date":"March 27, 2024","format":false,"excerpt":"https:\/\/youtu.be\/S5g2-pQ9rAk What are the best solar inverters in Australia in 2024? I surveyed SolarQuotes' network of over 500 Aussie solar installers to find out. I asked the installers three questions: What inverter brand would you choose for your home if money was no object? Which one would you select if\u2026","rel":"","context":"In "Solar Inverters"","block_context":{"text":"Solar Inverters","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-inverters\/"},"img":{"alt_text":"Winners of the 2024 Inverter awards","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/03\/inverter-winners-2024.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/03\/inverter-winners-2024.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/03\/inverter-winners-2024.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/03\/inverter-winners-2024.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":94954,"url":"https:\/\/www.solarquotes.com.au\/blog\/sungrow-solaredge-inverters-trade-mb3283\/","url_meta":{"origin":87470,"position":4},"title":"Sungrow & SolarEdge Spruik Solar Inverter Trade-In\/Up","author":"Michael Bloch","date":"October 3, 2025","format":false,"excerpt":"Solar manufacturers Sungrow and SolarEdge are still offering inverter trade-in (or up) programs in Australia when upgrading their systems to new hybrid inverters and\/or batteries from the respective firms. Here's how the schemes work and what you can get. Sungrow Inverter Trade-In Offer Originally launched in late June 2025, Sungrow's\u2026","rel":"","context":"In "Solar Inverters"","block_context":{"text":"Solar Inverters","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-inverters\/"},"img":{"alt_text":"SolarEdge and Sungrow Inverters","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/solaredge-sungrow.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/solaredge-sungrow.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/solaredge-sungrow.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/solaredge-sungrow.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/solaredge-sungrow.png?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":45602,"url":"https:\/\/www.solarquotes.com.au\/blog\/sungrow-inverters-australia-mb1794\/","url_meta":{"origin":87470,"position":5},"title":"Sungrow Celebrates 1GW Of Solar Inverter Capacity In Australia","author":"Michael Bloch","date":"December 10, 2020","format":false,"excerpt":"Solar inverter and energy storage manufacturer Sungrow has reached a significant milestone here in Australia - 1GW of inverter capacity deployment. The company has come a long way since its very humble beginnings. Sungrow was founded in 1997 by Cao Renxian, who was a professor at China's Hefei University of\u2026","rel":"","context":"In "General Solar & Storage News"","block_context":{"text":"General Solar & Storage News","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-battery-news\/"},"img":{"alt_text":"Sungrow solar inverters - Australia","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/12\/sungrow-1gw-australia.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/12\/sungrow-1gw-australia.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/12\/sungrow-1gw-australia.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/12\/sungrow-1gw-australia.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/12\/sungrow-1gw-australia.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/87470","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/users\/28"}],"replies":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/comments?post=87470"}],"version-history":[{"count":19,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/87470\/revisions"}],"predecessor-version":[{"id":96798,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/87470\/revisions\/96798"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media\/87942"}],"wp:attachment":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media?parent=87470"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/categories?post=87470"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/tags?post=87470"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}