{"id":28334,"date":"2019-04-16T11:23:40","date_gmt":"2019-04-16T00:53:40","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=28334"},"modified":"2019-04-16T16:32:20","modified_gmt":"2019-04-16T06:02:20","slug":"perc-solar-panels-letid","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/perc-solar-panels-letid\/","title":{"rendered":"PERC Solar Panels And LeTID — Cause For Concern But Not Panic"},"content":{"rendered":"

\"PERC<\/p>\n

Solar panel manufacturers are always on the lookout for low cost improvements they can make to get an edge over the competition.\u00a0 Or rather, stay in competition, as they are involved in a Red Queen Race1<\/a><\/sup> where they have to run as fast as they can just to stay where they are.<\/p>\n

One popular method of improving solar panel output that has been to create PERC panels.\u00a0 Two years ago I explained (badly) what a PERC solar panel is<\/a> and I said you don’t need to give a damn whether your panels are PERC or not.\u00a0 Unfortunately, it turns out you definitely might need to give a damn because many PERC panels have suffered from excessive deterioration called Light and elevated Temperature Induced Degradation; or LeTID for short.<\/p>\n

The good news is the manufacturers of quality PERC panels are aware of the problem and are generally working to eliminate it.\u00a0 In a year LeTID shouldn’t be a concern for new solar power installations as in 2020 PERC solar panels will have to be certified as LeTID resistant to be sold in Australia.<\/p>\n

In this article I will briefly go over what LeTID is and what you can do if you have PERC panels installed on your roof and are worried they may deteriorate.<\/p>\n

But if you really want to know about LeTID and get up-to-date information on which PERC panels are resistant to it, I highly recommend reading this article on the MC Electrical blog<\/a>.\u00a0 It was written by Ben Neville, the Technical Sales Manager of MC Electrical<\/a>, and in the third part towards the end, it provides current information on how well-known manufacturers are either dealing with the problem or have dealt with it.\u00a0 If you are at all interested, please check it out.\u00a0 The main reason I am writing this article is to draw attention to that article.<\/p>\n

Light & elevated Temperature Induced Degradation<\/h2>\n

You probably won’t be surprised to learn Light and elevated Temperature Induced Degradation is caused by light and elevated temperatures.\u00a0 I don’t understand how it works exactly.\u00a0 I don’t even understand how it works inexactly.\u00a0 But it appears to result from impurities in the silicon used to make solar cells, with hydrogen being the main or perhaps only culprit.<\/p>\n

It is worse in hot climates and that’s what the climate through most of mainland Australia counts as.\u00a0 The reason why it is worse in hot climates is because LeTID is caused by a chemical reaction and these occur faster when temperatures are higher.\u00a0 A rule of thumb used by chemists is a 10 degree increase in temperature will double the rate at which reactions occur.\u00a0 This commonly true for organic chemistry, but since we are talking about silicon, to be sure you’d have to ask an inorganic chemist.<\/p>\n

\"inorganic

Here we see a picture of an inorganic chemist hard at work. (Image: Chemistry World)<\/p><\/div>\n

On the off chance you can’t find a robot chemist, you could always ask a human chemist who specializes in inorganic chemistry.\u00a0 I understand there’s a few of them around.<\/p>\n

Manufacturers Are Working On The Problem<\/h2>\n

Solar panel manufacturers are working on the LeTID problem.\u00a0 Or at least the ones that care about quality and reputation are.\u00a0 If you buy cheap no-name PERC solar panels, then major LeTID issues would not be a surprise.<\/p>\n

This article<\/a> written just 5 months ago suggests many PERC module manufacturers were unaware of the problem.\u00a0 But at least 9 times out of 10 when you raise a potential panel problem with a manufacturer’s representative you’ll get a blank poker face stare while they process the question followed by useful information if it is something they are comfortable taking about, or a denial there is a problem if the topic is out of their comfort zone.\u00a0 Sometimes they seem so uncomfortable I get the impression their comfort zone must be on another planet.<\/p>\n

The good news is many manufacturers are working on the problem and in some cases have LeTID beat.\u00a0 The reason why they have worked hard on it is because tier one manufacturers sell panels to solar farms where output is monitored carefully and if large numbers of PERC panels fail to meet their performance warranty it will cost the manufacturers a vast amount of money.\u00a0 It is possible we will see more than one manufacturer suffer major financial distress because they didn’t get onto the problem soon enough and sold large numbers of LeTID affected solar panels.<\/p>\n

How To Protect Your Solar System Against LeTID<\/h2>\n

The easiest way to prevent LeTID affecting your panels is don’t buy PERC panels.\u00a0 Alternatively, you can check Ben Neville’s article and make sure you only get PERC panels from a manufacturer that have solved the problem.<\/p>\n

MC Electrical Has High Standards<\/h2>\n

MC Electrical won’t install any PERC solar panels they are not confident are LeTID resistant.\u00a0 Your standards don’t have to be as high as theirs, but I don’t recommend using PERC panels if the manufacturer hasn’t provided good evidence LeTID isn’t a serious problem for them.<\/p>\n

Whether or not you can believe what manufacturers say is for you to decide.\u00a0 I generally believe what tier one manufacturers tell me, but I have been married three times and that might be an indicator of how good a judge of character I am.\u00a0 But more likely it indicates what poor judges of character my ex-wives were.<\/p>\n

A Lower NOCT Is Better<\/h2>\n

Because temperature is a major factor with LeTID, if you are getting a PERC panel — all else equal — you are better off getting one with a lower NOCT which stands for Nominal Operating Cell Temperature.\u00a0 The lower this figure, the less hot a solar panel will get in the sun.<\/p>\n

What To Do If You Have PERC Panels On Your Roof<\/h2>\n

If you have PERC panels on your roof you may have a problem, especially if they were installed one to two years ago when PERC solar panels were new.\u00a0 Fortunately, you are protected by your panel’s performance warranty and by Australian consumer law.\u00a0 While the fine print in most performance warranties appears to make them pretty shitty<\/a>, this shit won’t fly under Australian consumer law.\u00a0 And if a manufacturer tries to make it fly in small claims court or a consumer tribunal, in my opinion, 9 times out of 10 that shit is just going to hit the fan.\u00a0 You should, at minimum, receive a new solar panel or a refund for each one that fails to meet its performance warranty and you can claim for the labour cost of having them replaced.<\/p>\n

How To Monitor Your PERC Panels<\/h2>\n

If you have PERC solar panels and are concerned about about them declining in output it is important to monitor their performance so you’ll know if you need to make a warranty claim.\u00a0 If you have monitoring equipment installed this makes it easy, but it’s not necessary.\u00a0 I suggest keeping a record of your system’s annual output.\u00a0 While this will vary from year to year according to the weather, if your PERC solar panels are suffering from serious LeTID you should be able to spot a downward trend2<\/a><\/sup><\/p>\n

If you don’t have records and are concerned your system may have deteriorated, you can use the Solcast site<\/a> to get an idea of how well your system is currently performing.<\/p>\n

If you find you have a problem it may be wise to wait until it’s bad enough to allow for a considerable margin of error so there can be no question you are entitled to make a warranty claim.3<\/a><\/sup><\/p>\n

Cause For Concern — But Not Panic<\/h2>\n

If you are looking at getting solar power installed and are concerned about PERC solar panels deteriorating, your choices are to either not get PERC panels or check out part 3 of the MC Electrical article to find out which manufacturers produce panels that are resistant to LeTID.\u00a0 Hopefully, in 2020 every PERC panel sold in Australia will be resistant to it.<\/p>\n

Even if you have PERC solar panels on your roof now and you bought them a couple of years ago, I would say that — fingers crossed — there is a good chance the panels will stay within their performance warranty provided they were tier one or from a manufacturer with a good reputation for quality, so there is no need to panic.\u00a0 Of course, if you have crap PERC panels from a crappy manufacturer, feel free to panic as much as you like.<\/p>\n","protected":false},"excerpt":{"rendered":"

Solar panel manufacturers are always on the lookout for low cost improvements they can make to get an edge over the competition.\u00a0 Or rather, stay in competition, as they are involved in a Red Queen Race1 where they have to run as fast as they can just to stay where they are.<\/p>\n","protected":false},"author":10,"featured_media":29598,"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":[46],"tags":[],"class_list":["post-28334","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solar-panels-2","entry"],"acf":[],"yoast_head":"\nPERC Solar Panels And LeTID -- Cause For Concern But Not Panic<\/title>\n<meta name=\"description\" content=\"It seems many PERC solar panels have suffered from Light and elevated Temperature Induced Degradation, or LeTID for short. 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Master of heavily researched deep-dive blog posts, his relentless consumer advocacy has ruffled more than a few manufacturer's feathers over the years. Read Ronald's full bio.","sameAs":["https:\/\/x.com\/BrakelsRonald"],"url":"https:\/\/www.solarquotes.com.au\/blog\/author\/ronald\/"}]}},"jetpack_featured_media_url":"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/dont-panic-perc.jpg","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2FF2s-7n0","jetpack-related-posts":[{"id":13282,"url":"https:\/\/www.solarquotes.com.au\/blog\/perc-solar-panel\/","url_meta":{"origin":28334,"position":0},"title":"What is a PERC Solar Panel?","author":"Ronald Brakels","date":"July 28, 2017","format":false,"excerpt":"Update 16th April 2019:\u00a0 Many PERC panels have suffered from LeTID deterioration problems since this article was written.\u00a0 This article here goes into the problem and this article on the MC Electrical blog covers it in detail and gives information on which PERC panels are resistant to LeTID. Solar panel\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":"perc solar panel","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/07\/perc-solar-panel.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/07\/perc-solar-panel.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/07\/perc-solar-panel.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/07\/perc-solar-panel.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":29514,"url":"https:\/\/www.solarquotes.com.au\/blog\/solar-panels-temperature\/","url_meta":{"origin":28334,"position":1},"title":"Pmax And NOCT: How Solar Panels Perform In The Heat","author":"Ronald Brakels","date":"April 18, 2019","format":false,"excerpt":"It's an unfortunate fact the hotter it gets the worse solar panels perform.\u00a0 As fossil fuel generators can suffer even greater efficiency loss due to heat, this is nothing to get all steamed up about.\u00a0 But it's still not a good thing.\u00a0 When deciding what solar panels to get --\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":"heatwave","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/temperature-solar-panels.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/temperature-solar-panels.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/temperature-solar-panels.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/temperature-solar-panels.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/04\/temperature-solar-panels.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":23791,"url":"https:\/\/www.solarquotes.com.au\/blog\/tindo-solar-panel-reliability\/","url_meta":{"origin":28334,"position":2},"title":"Tindo Solar Claim Spectacular Reliability: 3 Failures From 240,000 Sold","author":"Ronald Brakels","date":"September 4, 2018","format":false,"excerpt":"If you are in the market for some Australian made solar panels then I have great news for you.\u00a0 It involves Tindo Solar as they are the only Australian manufacturer of panels.\u00a0 If someone selling any other brand of panels says or suggests they were made in Australia, be super\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":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/tindo-update.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/tindo-update.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/tindo-update.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/tindo-update.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/tindo-update.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2018\/09\/tindo-update.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":40405,"url":"https:\/\/www.solarquotes.com.au\/blog\/solar-panel-letid-update\/","url_meta":{"origin":28334,"position":3},"title":"LeTID Update: Unlikely To Become The Problem Many Feared","author":"Ronald Brakels","date":"June 22, 2020","format":false,"excerpt":"Fourteen months ago I wrote about a type of solar panel degradation called LeTID.\u00a0 This is short for Light and elevated Temperature Induced Deterioration.\u00a0 It's also Norwegian for \"laugh time\" which is what I think they called the Joker movie over there. LeTID loss is experienced by PERC panels, which\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":"letid update","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/06\/letid-update.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/06\/letid-update.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/06\/letid-update.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/06\/letid-update.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2020\/06\/letid-update.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":27267,"url":"https:\/\/www.solarquotes.com.au\/blog\/risen-longi-solar-records-mb0906\/","url_meta":{"origin":28334,"position":4},"title":"New World Record Claims From Longi Solar And Risen Energy","author":"Michael Bloch","date":"January 21, 2019","format":false,"excerpt":"Two of the world's solar panel manufacturing heavyweights have announced PERC technology related world record claims over the past week. Longi Solar - Monocrystalline PERC Cell Record Last week China's Longi Solar said it had achieved a new monocrystalline silicon PERC[1. PERC stands for Passivated Emitter and Rear Cell or\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":"Longi Solar and Risen Energy","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/01\/longi-solar-risen-energy.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/01\/longi-solar-risen-energy.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/01\/longi-solar-risen-energy.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/01\/longi-solar-risen-energy.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/01\/longi-solar-risen-energy.png?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":17606,"url":"https:\/\/www.solarquotes.com.au\/blog\/ja-solar-perc-mb0365\/","url_meta":{"origin":28334,"position":5},"title":"JA Solar Claims World Record For 60-Cell PERC Solar Panel","author":"Michael Bloch","date":"December 14, 2017","format":false,"excerpt":"JA Solar has announced output power of its 60-cell solar modules comprised of mono-Si PERC cells has exceeded 325W; reaching 326.67W This result represents a new world record for 60-cell monocrystalline silicon panels stated the company, and was measured and verified by T\u00dcV S\u00dcD. \"Setting a new world record 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":"JA Solar PERC solar panels","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/ja-solar-perc.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/ja-solar-perc.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/ja-solar-perc.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/12\/ja-solar-perc.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/28334","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\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/comments?post=28334"}],"version-history":[{"count":41,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/28334\/revisions"}],"predecessor-version":[{"id":29609,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/28334\/revisions\/29609"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media\/29598"}],"wp:attachment":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media?parent=28334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/categories?post=28334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/tags?post=28334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}