Recording and presentations: Ultra-high power modules: How inverters manage higher power per string and achieve LCOE reduction

15 September 2020

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Automated transcription (it may contain errors)

Unknown Speaker 0:17
Hello, everyone, good morning, good afternoon depending on where you are connecting from if you have gone to watched a webinar on ultra high power modules, then you are at the right place. So we won’t be starting quite yet. So we’ll allow for another minute or so do lead everyone to give time for everyone to join these, these webinar. But in the meantime, I will give you you know, make a couple of of housekeeping announcements as it were. So one of them is that you will definitely get a recording of this webinar and this live So you’ll get those by email, if you’ve signed up and also get an email. You know, in about probably early next week at the latest, you’ll get an email with the recording and the presentation slides. And also, you know, I’d like to remind everyone that you can ask questions. So you have a view. If it’s the first time you’re here with us look at the toolbar, which is across the bottom of the screen, and you have a questions and answers. box there. And, yes, so that’s where you can pose your questions and ask our experts today to to be spelled, you know, any doubts you might have about ultra high power modules, or investors. So, right, so let’s wait for a few more seconds and then we’ll get We’ll get started. I’ll introduce a webinar again for those who are who had will have just joined us.

Unknown Speaker 2:39
Okay, well let’s start this time. So welcome to webinar ultra high power modules how inverters manage high power stream and achieve LCD production. So, welcome to our webinar today we’ll have three experts and donyo humanities from threenager. From our way and almal Darby from FMA talk about different aspects of ultra high power modules and inverters and how they work together. So today, just for those of you who arrived a little bit late, we will definitely be recording the session. And you’ll get an email with the recording and the presentation slides probably early next week. And also remember that this is your chance to ask questions through the questions and answers box which is at the bottom. And finally, well, we have a tradition here at ADA, insight we, through the chat box, we ask people to say where they’re joining from. So I am actually in Poland right now. So and my colleague had seas in Spain. And so yeah, just doing the the chat box and let us know where you’re connecting from. So, think now we’ll get started. And as you can thank you very much it’s stopping sharing. So, right now I’ll ask each of our panelists to introduce themselves. So, Amara, would you like to start with introducing yourself very briefly. So,

Unknown Speaker 4:28
good. Morning. Good evening, and good afternoon, everybody. My name is Alma division and Applications Engineer, May. I generally cover large scale dv and storage applications, and I’m very excited to be presenting today alongside the interview Institute.

Unknown Speaker 4:45
Thank you very much, Omar. And Antonio, I see you have, you know, you want to go next so go

Unknown Speaker 4:55
ahead, get rid of it. Much Carlos. This is Hi, Antonio. I’m responsible After solar for Middle East and Africa for all the proper solution. Thank you very much.

Unknown Speaker 5:06
Thank you Antonia. And last, but definitely not least, Steve, would you mind introducing yourself very briefly?

Unknown Speaker 5:15
Yeah. I’m Steve. Now I’m in Shanghai. And I’m responsible for the hallway r&d for the technology and innovation of the universe. So today, I was talking about like the in water, how to compare how to compatible with the Archer, like the higher power modules. Yes. Thank you very much.

Unknown Speaker 5:35
Thank you very much, Steve. So, right, so well, you know, once again, welcome everyone. I think, right now we can get our first presentation started on don’t you? Over to you whenever you want. And Will’s Antonis getting ready. I’d like to remind you that You can ask questions through the q&a box. So, you know just and then we’ll answer them after all the presentations either Antonio overdo

Unknown Speaker 6:14
or you you’re on mute by the way Sorry.

Unknown Speaker 6:16
Sorry. There we go.

Unknown Speaker 6:20
Hello everybody and thanks for time. We’d like to present today the brief introduction of the new to high power module of their 550 600 watts. So it this is a was presented lately. What is the new offering of Trina solar as the most advanced products in the market, we are bringing it to the market to four products, two of them are beneficial, two of them are a beneficial one if 550 watts, another 600 that you have seeing is that with the new 210 so if we go For the capacity for next year, we will have already in 2020 capacity, a capacity of 10 gigawatts, which we will increase to 21 gigawatt next year and 231 in 2022. So, we see that this will be a really mangosteen product for us in the market. So let’s explain a bit how the model is built on the on the main characteristics. So the 550 watt module is a module which not only has a very high power but also also a high efficiency rich in 21%. The base of this module is the sell of 210 millimeter, the largest sell currently in the market. And that one that provides a very high current, they This is a module, I will say that it’s longer and wider, we have two option one is wider, the other longer. This is Richard two point almost 2.4 meters long, which is almost the size that will fit in a container. So, it will really optimize the the logistics and it has a width of one point almost 1.1 meter, the the weight of that or the weight of the module we are talking about doing around 20 kilos for the back sheet and 32 for the dual glass is still a weight that is manageable that can be standard many, much different. So, of previous modules in the market. These and they have a series of characteristic of with a sale that makes a very reliable product, but I will go in the following as like this are the non destructive cutting the multi purpose bar high density and so on. One interesting characteristic of this module is that we depart from the traditional is 144 or 120. We are stuck in the module have five by 11 have got cell. So, we are we are talking about 110 cells into into secret that the gifts are lower voltage and this a lower voltage we are talking in this model around less than 40 words around 38 if a debt was and gives a to compensate that the government is very high or much higher than it was before around 1818 numbers for them unofficial. This a characteristic for the module is still have the three the three diode so we’ll have a very safe in terms of how to spot and also it’s a allows very important characteristic that I will explain later which is a very high power pedestrian. The race will dock is the temperature coefficient similar to many of the of the throat of tuna soil has a very good thermal coefficient and they want it as good as a say oh the Trina solar product we are talking about 2% the first year and Cedar Point 45 for the last for the next 30 years. In the case of 600 the characteristics are similar, because he says similarity construction similar cell, the only thing is that is instead of five by 11 is six by by 10. So, it did it looks a bit more similar to the traditional a traditional model. In this case the efficiency increases because it doesn’t have the vertical connector that for having six because it has six cells. Going a little about more inside the module I would like to explain that. The advanced characteristic of this module which makes the bay advanced which is the non destructive cutting edge is a low temperature low temperature procedure without mechanical separation As you can see on the right side gives the same mechanical strength as a full sail almost the same and much higher than other than other traditional methods. So when we are talking that this model is very reliable is that they still are as reliable, as strong as a full sun as a full as if it weren’t full cells. And

Unknown Speaker 11:24
then the following is about the multiples bar. This is something that during Assad has been working in, in commercial model for them for many years, which is that we replace the flat ribbon which was useful when they were five bucks bow with a with a wire round wire that reflects the energy back to the light back to the model because it’s fun and has a device additional. Additionally, also, as because there are many more many more busbar the distribution of temperature is much more is much more equal, and it reduces the path of electricity. So it gives a higher power. Also, it’s in the air regarding a hot spot. It’s also very, very safe product because it has a, they have a 3d out for many a few ourselves have very high quality sales. And it’s a it is a brother that has less risk of heart to sport than his standard products. In terms of interconnection, the the standard a standard model will have a gap between self of around two millimeters, we have reduced that to less than half millimeter, which allow us to have an efficiency of up to 21 or 21 2%. But without the loss of without the loss of yield because of a lab in a cell so if you put a cell on top of another Of course, efficiency increases, but there are losses of energy because the risk part of the seller which is shadow, which doesn’t receive the light, and that reduces the amount the performer. So, the same module, if you choose a high density module instead of a module, which overlapping the year will be higher. And then the main characteristic, the sell off to 210 has a high power and because it’s a big it has a low voltage and this allowed the most important thing more power per string. The string at the end is the what makes it is the basic subunit of the PV plant, they and all the evolution of the of the power has gone into a performance has gone into higher current which means higher energy because it’s very clear the voltage now phenomenal Is 1500 bucks as a reference? So, we are adding up modules the rich voc 1500 bucks operational around thousand and 100. So, we have the same voltage industry what in order to have more power we have more caring. So is this means more roses? No it doesn’t mean more losses, what we are doing is that instead of 982 strings, what what what is it more courage to a string of nine numbers of one a string of 18 numbers is the same. So, seniors the same losses are similar. So, that is a that is obtained there are no more losses of current what we have is more power which reduced the VA VRS and a which their minds because of the plans how much additional power so, we have a For example, this is an example of a 10 degrees when we have a a for example, in Middle East and Africa places with a warmer temperatures, we can reach to even for 40 to 42. So, we are talking about 20 to 22 kilowatts per string, this is a very high very high power and this is not official even higher with official. So, compare with even the very advanced module currently is is 35% more 36% more even higher, which this allowed to reduce a number of strings in the in the, in the in the plant and to reduce the cost of the cost of the of the solution. How much are we going to reuse? Make an analysis third party analysis by DB l we see that we reach in the US 6.5% in the viewers and I see we have three point almost 3.8% and this is compared with a similar module of more than 400 watt compared with a model of less than 500 watt is even higher. So, this is a good advantage. The question is what we are going to answer today?

Unknown Speaker 16:11
Are these advantages realized. And for that, a we are here today because the research No, it’s not only us is a group of more than 70 companies that are a working to develop all this range of product above 600 600 watt, because one thing is clear, it’s not possible to reach more than 600 watt with a smaller. So, you will need more than 80 cells to reach that. So, in order to do that, you need a higher current and in order to have a higher current, there are there are many products which are a which can be used. Now, it can be it is possible to install it to use a governing inverter current triggers, but we’d have 40 optimization, if you will, we will realize All the savings. And this is a, this is something we have a lot of companies working for that. And we are also discussing today with the Hindu they also for the for the better. So let’s see. So I would like so I would like to give the boys back to Carlos. And also today Omar and his team to give their view.

Unknown Speaker 17:22
Thank you very much Antonia for your presentation. Very interesting. So in between each presentation today we’ll have a poll. So you know we can if you can stop sharing, please Don’t kneel and an aid you can share the first bowl off today. That would be great. So here we go. hope you can all read it correctly. So eight reads want power been arranged Will you expect to use the most in 2021? So we’ll keep this question. Open for A few seconds we’ll do a countdown when we asked to do stop it. And well, in the meantime, you know, we’ll see the answers coming in at night to remind you of the fact that you can ask questions. So send your questions through the q&a box after you have participated in the in the poll, and also remember that we’ll send you the recording of these sessions. So, right so we’ll keep it open for three more seconds now. So three to one. And that’s it.

Unknown Speaker 18:40
Right, thank you.

Unknown Speaker 18:43
Thank you very much. So well, he you have briefly the results. And so now we’re going to go do the next our next speaker today. Who is Steve Jang from who away So if you can get ready, Steve.

Unknown Speaker 19:08
Yeah, I’m here.

Unknown Speaker 19:09
Yeah. So I can hear you. Well, and I can see your presentation are full screen. So please go ahead.

Unknown Speaker 19:17
Okay, thank you. Yeah, it’s a great honor to attend the lists webinar event hosted by Chino sola. So thank you also, thank you very much for the invitation. And today we’re talking about hardware smarter PV solutions. And my topic is a boost for optimal arcp and greatest spot. Okay, Nesta slice and today it will be including two parts. One is for the oath is kind of solution for the 6.0 and plus, and the second one it is what is the strategy with the high colander modules for the hobby site? Okay, next And based on the understanding about Huawei, so, how we provide fishing solar smart PV solutions and it is it consists of in water as the left side this is our water is like a five kilo water smartstream water and also the second product is the smarter array controller, this is for the data transmission and control and also the soda is a smarter transformer station. This is also for the OSI market this is integrated with LTE capital cabinet and transformer and also the IMU and for the smart PV measurement system for the real time monitoring and also measurement. And today I will would like to introduce our latest like some progress how we deploy AI technology in fusion solar. Okay, next one From the solution view for homicide we are insist on the multi MPPT topology design for wind waters, which brings the maximum benefit to customer by reducing the stream mismatch and improve the energy yet for the 185 kilowatt inverter, so, it is integrated with nine MPPT s and wese 18 inputs. So, to stream Perrier together to introduce like the stream mismatch accumulatively Holly had delivered 130 gigawatts shipment by the end of first half year of 2020 based on the customer rear sight test, so, here is all the data that is we are tested with our customers. So the generation flown by the stream water so it is at least 2% higher than the traditional solutions. Okay, next one. And also this is the deployed by AI what is we are calling is the smarter DC systems What is the meaning of DC smart DC. So, the checker it is connected to the smart inverter and the check the angle is optimal and control based on AI algorithm This is gross local control after doing this control checker we are learning at a different angle according to the tracker structure status including the shading on different will reflect the material and the operations. So, by doing so, the checker will ensure the panel’s working on another level MPPT. So this is the check lower noted in water level. This is a result any additional cost to do so. It is just the latter like the older

Unknown Speaker 22:58
older checker system is connected To order in order in order to deliver all the data and also the signals to the SCADA systems. So, in 2019 we did some tests at the central side in China, their introduction by this AI algorithm increase the generation yes by 0.5 to 1%. By Elisa smarter DC systems. Okay, this is the photo smart DC and not going to the another powerful AI technology. It is my IV co diagnosis. So, this is for Huawei, the solar generation already in the last six years. In the first video on the left loses the manual inspection. It is impossible to perform like I recall diagnosis for older street in largest scale PV plant, the O and M stuff is only able to inspect 1% to 3% of the pure plant and it is takes another like three days to complete the analyze and come up report. But on the right side, this is by Huawei. We are going smart IP code diagnosis has to diagnosis like a 100 megawatt plant within 15 minutes to generate a report automatically. This is online diagnosis resolve pluck out all the streets thrown in orders. Here, it will take a long time, like one gigabyte of data in 100 megawatt plant for self learning based on AI. Ai we are learning it and come up with a report to share indications like what kind of which module and which streets we needed to do like the troubleshoot is it have asked you know the hairs of pure plant and follow more innerwear leader to higher germination after doing the collection, and troubleshooting according to the diagnosis report. So, this is also based on AI to do the smart IV co diagnosis to increase om efficiencies okay next one and this technology is for the data transmission What are we are calling is m pass. So, for the Airbus it is consists of two important components one is Holly Oh high silicon chipset and the second one is Holly IoT operating system based on this technology. So, all the data we have faster way to do the transmission what is effect Firstly, like the transmission distance is more than one kilometer, it can support maximum capacity of summary up to like 50 megawatt secondly transmission speed it is reached 115.2 kick bps So, it is 15 In terms of us 455 cables it it doesn’t need additional RS four or five cable like before when we do like doing some the communications whining od in order and oh the physical box by the US for five cables, but no we no need any cables it adjusted to using the AC power cable to do the complications after the traditional RS four five cable is eliminated and another use which not only series material and the main power cost for the RS four five cable but also enhance on empty liabilities. This feature is the foundation of the old AI implementation which require fast and reliable data transmissions Okay, so this is for the bus, go to the next slice. Part of let so we are talking about the grief support

Unknown Speaker 26:57
as the ratio of Lindy newable increase now Like the solar and also the BSS now is a very popular and with the application also with the new actually DC and the AC system the impedance of the power grid we are changing accordingly for example, like if today you are pure plant is safe and not impact on the grid, but several years later after the solar is more animal and especially injected to the sun like odor pure plant is injected to the simple component it will lead the pure plant have another potential liability issues. Now, we needed a solution to support a grid and adapted to the impedance changes slow the AI self learning algorithms, this unika arsf self like the learning prepare the pure plan for the future even during the regional renewable energy increase. So now as the large Right. So, for Howie now following order, so, it came due support minimal the str str What is the meaning is short circuit judicial can go into 1.5 So, this is means like for example, like in Australia like in China and also in Spain. So, in order when we connected to the low str of the some environment so, it is a safe and also reliable. So, this is what is whether we are coding So, we wanted to our in water is more friendly to the grid and the led the half most people space to connect to the grid. Okay, so, going to the next slice. So, all the above all the above is talking about some of our key feature for the smart PV solutions. And now we are moved to the doctors shortages for the high colander modules. Next From the electrical parameter view, no matter no matter like the maximum power and coolant voltage, this is a fully matched with our new one a five kilowatt a Middle East. So, the abiti current of our inverter the each MPPT is up to 100 mP It is one of flexible to let it simmer it can connect to five strings and logical into modules. This is a means like a post put MPPT week maxima to connect like five streets and fall in water. So, also this is the maximum for the string quantity it is 18th So, this is the means from the water this is a new model but also it is compatible with the maximum Collins of the panels. Okay, let’s go into an s one. Now we are taking the vertex as a Example. So, consider like for the globally like a lower temperature like from the sunlight minus like a 20 degree oh five degree Oh like four degree. So, we are do some calculations using like 550 or using six find your water. So, for when the water is connected 15 students so, the DC solution next time it can go into 75 percentage of the DC solution. So, it is means it can fully see water it can support larger DC solution and also it can measure with the Trina solar letter the the vertex of the PV panels. Okay, I think so for my presentations. Thank you very much.

Unknown Speaker 30:49
Thank you very much, Steve for your presentation. So I think we’ll now get ready for another poll. So Anna, whenever you can launch it and I can see that you have been sending questions through the q&a box and we’ll answer okay as many of them as possible on the after the third presentation. Here we go here is the the poll, I hope you can all see it so it rates which of the below you can’t see the most important decisive factor for PV modules when designing a plant. The options are efficiency module power, power degradation by fish ality weight or other. So we’ll let that run for a little while. So they can have as many people as possible can participate. And

Unknown Speaker 31:51
well in

Unknown Speaker 31:53
Yeah. So those are your options there. It seems that efficiency is sweet. Go on to say most important factors. So we’ll keep it open for a few more seconds and and that said, So, start a countdown now so 321 There we go. That’s it. Right, well. So these are the results of a poll. So efficiencies are the most important factor followed by module power. So let’s continue with our presentations to today. So next, Isa Omar Darvish from SM ma so my when you are ready place to start your presentation.

Unknown Speaker 32:44
Thank you very much, Carlos.

Unknown Speaker 32:48
Basically, let me just get this set up real quick. Perfect. You all can see my screen.

Unknown Speaker 32:53
Yes. Yeah, looks looks perfect.

Unknown Speaker 32:56
So I’ll focus today. More on on Basically the topic at hand, which is very compatibility with ultra high power modules, and I’ll take more of a technical route during the presentation. But first, just quick, some quick figures. I’m pretty sure you’re familiar with our company. We’ve been in business for 35 plus years. Right now with 3000 employees strong. We’ve got around 95 plus gigawatts of installed capacity in 190 countries and about 1200 granted patterns. In terms of financials we’ve just released our h1 reports for 2020 despite the coronavirus pandemic, we’re still going strong actually expecting significant growth in sales and and inverter capacity, as opposed to last year where we shipped around an 11 and a half gigawatts. Well, in the first half of 2020, we already shipped around seven gigawatts of inverters for you Those of you who are not familiar with our product portfolio we cover basically, the full range from residential to commercial to utility within battery and PV inverters. With with the power ranges ranging from 1.5 kilowatts, up to 4.6 megawatts in a single inverter. Another of the marketing and marketing talk, I’ll just quickly tell you what we’re going to be discussing today. So what I’m going to attempt to do in this very short 15 minutes, is basically discuss the module fundamentals. So what is really the scientific, let’s say fundamentals behind these ultra high power modules that you’re seeing on the market today. And mainly we’re going to be discussing short circuit and operating currents will then discuss the implications of such high currents on inverters in general and specifically on the module and birder interface, which is the MPPT. And finally, we’ll discuss or showcase compatibility of these high current modules with current SME environments. I’m taking you back basically to be the one to one this, whoever has taken NPV course or maybe as attended a presentation this is basically what the manufacturing process of PV module looks like. You basically get silica you procurify it crystallize it, you get a an ingot slice it peels away for you then do maybe it shit, dope it you get a son, you assemble the cells in a margin and you got a system. What we’ve been seeing basically since the mid mid 1990s, all through the early 2000s, or all the way to 2020 is a clear trend of growth in wafer size. In the literature, you’d see these basically as their names is around like m zero m three m four m six if you’re reading an article on TV tech or something, and these are the most popular they have been the most popular For the past decade and a half, so the zero which is around and around 156 millimeters in size. Also the M six, which is around 66 millimeters in size are responsible for like the 300 watt peak modules. Whereas, the newer introduction of the antenna 12, which can go up to 210 millimeters, which is the wafer being used at the vertex module, or are being used to generate basically modules with 500 and 600 watt peak power. To understand where this comes from, we really need to take a step back to them. Basically the physics I mean, here’s a cross section of a normal PV cell. And basically what a PV cell is, is a current source. You’ve got some light coming into the top part. Basically, that beam of photons photon would knock over an electron, the electron will be collected and then goes through the circuit the number of electrons being generated is directly proportional to the radiance. So basically, you can model a PV cell as a radiance controlled current source, you can increase this current by increasing the radiance. Or if you keep the radius constant and increase the cell area, you’ll get also more kinds. So largest area, more photons being bombarded on the cell, larger currents.

Unknown Speaker 37:27
One might say then, but aren’t these cells cut in half specifically, the vertex module is using half cuts on technology. Well, you’d expect half the current relief if you’re doing half cuts of technology and you’re stringing all of these in series. So it basically cut the current in half and see double the voltage but what usually manufacturers do is basically when they cut the the southern half, they cut, also the modular in half and you get instead of, let’s say, 120, half cut cells in series, you got 60 on each side. to keeping the voltage and the current constant even when you’ve got the sun regarding bisexuality, it’s it’s modeling the behavior of bifacial is quite straightforward. What you’re doing with the bifacial Sun is allowing albedo irradiance to hit the sun from the backside. You can then model it as a motivation side. by transferring the radiance, it’s going in from the backside towards the front side. But of course, the efficiency at the back side is different than the front side. And the ratio between the two is what’s known as bisexuality factor. So if you have a situation where you have 1000 watts per meter squared on the front side, 200 watts per meter squared on the backside, then that would be equivalent to having around 1260 watts per meter squared on the front side. So higher also by efficient means, plus larger wafers. means more and more currents in terms of short circuits, and I MP. Going back to this graph right here. These are the values you’ve been all used to in the past decade, talking m 02. And six I typically have around 10 and a half amps have short circuit current, while the newly introduced m 10. And m 12. can go up to 19 amps of short circuit current. So what does that really mean for inverters? At the DC interface, we really are looking, we need to look at two values. So, I mean for wafers you’re looking at imp which is your maximum power point current and your short circuit current as well as the inverter, you’re looking at the operating trend of the of the MPPT whether it’s multi MPT inverter or a single empty inverter, and you’re looking also at the short circuit capability of your inverter undiscussed quite quickly. What what the are so short circuit current is basically as, as it pertains to the inverter is basically the ability, the maximum current that your DC DC converter can accept. It’s generally a worst case calculation. So when you’re matching your short circuit current from the modules or your array towards your inverter, and both the single and multi MPPT case, what you need to do is you need to assess how much short circuit current your module is producing at the maximum temperature irradiance combination. That’s so you look at the spectrum of temperature, you look at the spectrum, I mean distribution also of your radiance on site, and you pick the worst points and you say, Okay, I can’t have many that I can’t have as many strings or basically as many or this specific margin that has short circuit current, more than what the inverter can accept. The operating currents is different stories, more Kostic rather than worst case scenario calculation, right? So you can basically have a scenario where your your margin is operating below the maximum operating current of the inverter. And that would mean I’m extracting the maximum power from the from the string or from that module. And you can have another scenario here in blue, where the maximum alternating current is actually below the imp of the module. And that is basically what we call clipping. So, a clipping is you’re actually clipping the modules or the strings current. Um, what do I mean by stochastic calculation? Well, if you’re oversizing it today, you’re definitely going to exceed the operating current of the inverter. This is some data actually some field data from a plant from two plants in Jordan, courtesy of our friends and stuff, but we had to have been in operation for quite some time. The Chosen just bution of the maximum CT current of the array throughout the year. And you can see that actually for most of the time, even for tracking systems, the current coming from the modules is well below the STC value on on the datasheet. That is because you’ve got light induced degradation, soiling on site, the air mass and humidity techs are it should be taken into account your azimuth and adjustable of your modules as well as shadow.

Unknown Speaker 42:31
Finally, how do you estimate and where this comes into picture? In terms of utility scale applications, we tend to go for single FET inverters. We believe that is the best solution there. And, of course, as it pertains to string and central inverters, I’m just going to discuss string because the central option is quite arbitrary when it comes to currents, because then you’re connecting hundreds, maybe hundreds of strings Did our bus back so in terms of our string inverters, you’ve got the 1000 and 1500 volt variants that come at 100 and 150 kilowatts capacity. And with the 550 and 600 Trina vertex modules, you can actually go up to 2.4 DC to AC ratio. One typical, or let’s say one problem that you might face and you need to look at the few sizes on these DC combiner boxes, there are 25 amps or 30 amp fuses are readily available on the market. So, you just need to look out for your fuses. And basically what what what single empty inverters provide is a future proof solution right. So, that same inverter can be connected, maybe in the future to 700 800 watt big modules, all you need to change are some few components or a combiner box. Actually, the larger currents from the DC Circuit create a better opportunity for optimization. So basically on a In terms of positioning, right, so in a single empty structure, you’ve got two degrees of freedom you can move this DC current matter DC combiner on as well as inverter. for higher currents, you would assume that the DC combiner would move more towards the modules due to the higher cross section of the cables coming from the modules. On the D central architecture, this is what we call the central introduction enables compensation of your DC losses basically the data coming from the higher currents by actually bumping up your DC to AC ratio. And just as a side note, SME invariants do allow you to go beyond 1.5 DC to AC ratio up to 2.5 even have these need to be assessed that depends really on the site conditions, but need to be assessed on a case by case basis. But basically, if you’re ramping up the DC to AC ratio, you’re using some energy from the modules themselves. To transfer the energy to the inverter, and then you’re not paying for the AC losses, and throughout the day, we tend to disagree on the mismatch losses due to string versus I mean single versus multi empty inverters and utility scale applications where we think you cannot gain more than point 5.6% in yield by using a multi mt inverter. That being said, for, let’s say, smaller plants, let’s say large commercial on the order of one two megawatts peak. This is a quick assessment of the compatibility of our multi MPPT inverters with the vertex modules. You can see here to the right actually the worst case short circuit current from the bifacial and the motivation. We’ve been very generous with the conditions 20% recycled radiance, 70 degrees, worst case temperature, and basically STC irradiance, and you can see that most of the inverters. I mean, all of the inverters are already compatible. Some do not give you as much flexibility. These are the 10 kilowatt. I’m not sure if it’s even applicable for such high power modules. But still, you can go up to 3.5, basically on a 15 or 20 kilowatt inverter. Some Finally, some things to look out for really, when you’re using such high current

Unknown Speaker 46:28
modules with multi MPPT inverters is basically first thing is you need to look at the string rating versus the MPPT rating on a datasheet. Typically, you’ll see the short circuit current of an MPPT but that doesn’t necessarily mean that the single string can handle that short circuit can double check, but some manufacturers are also limit the power pair MPPT. So that would lead to high vd extremely high clipping losses. If you’re using such high string power on your DVDs. And finally, some actually ratings are voltage dependent. So you need to take care of your worst case voltage or radiant temperature combination. In that case, I find a load on PVC, just not a lot of people know that. But PVC actually models a monthly MPPT inverter as to separate or like a number of separate inverters. So, let’s say a 50 kilowatt inverter with five MPPT PV system model it as five separate 10 kilowatt inverters, which is entirely not true. That does not really reflect the real conditions at site and how the inverter behaves. Even PV system documentation says it is your responsibility to check in the data sheets whether the allocated power is compatible with the manufacturer’s specification. So let’s say green light on your system data and pvcs isn’t enough. I would look at the documentation specifically look at the manual as well, because not all the data’s and data sheets, and I’ll leave you actually with a picture From Trina’s lunch event, the smdc with our 110 kilowatt inverter. Thank you so much.

Unknown Speaker 48:07
Thank you very much, Omar for your presentation. Actually, you’ve got fans in the audience. So you have someone congratulating you and your excellent presentation. So I agree with those. Thank you very much as you know, as have been all the presentations today, very interesting. So, right, so we have a final poll, I believe, is that right Anna? So here we go. Yes, that means yes, we have a final poll here, which is, what is your usual project size? Any first option is less than 200 kilowatts between 200 kilowatts and two mega watts between two megawatts and 20 megawatts and more than 20 megawatts. So it seems that we have majority of people in the world audiences are developing larger projects, projects of more than 20 megawatts. So let’s let the bull run for a little bit longer. And yeah, I think we can start a countdown. So in five seconds, so we’ll we’ll start saying 2321 stop. Right. So well, the most common project size in this webinar at least is more than 20 megawatts for two qubit percent of the answers. So, right. So well, we only have like 10 minutes left. So let’s jump right into the questions. And, you know, I have a question really regarding the regarding hotspots. So you know, Wi Fi, high currents Is there any other additional risks of hotspots or junction box reliability issues? And that question is from Tanya. From Trina

Unknown Speaker 50:13
Yeah, hello, thank you very much. This is a very interesting question. Of course, there is a, I understand the concerns of having this higher current in a single model. But, you see, first of all, a fix in the junction box or combine both what I see is that it was very typical to put two strings together of nine or 10 amps. So, together in a single deputy that was very useful in the market. So now instead of destroying you put one one together, so at the level of a combiner box, that will be no problem. Inside the module, the module has been designed to withstand the current so there is and it goes all the tears that 5061 732 guys go past all those things. So, it’s as safe as any mother has been before any any more concerns there apart from having that having the other certificates that having the best sell in the market, which is that has been done with a non destructive cutting, which means that it’s as strong as a as a cell it has one other thing. Now then if you see the number of diodes that you will find in a string, because there are less there are more module there will be many more many more bypass diodes and this is also the number of bypass diodes and the voltage for each diode is a related to the risk of a of a hotspot. So having more dials on the string reduces that risk, but medically are what the most important thing about hottest sport is the quality of the supplier. So, in this case, if you go I mean, God has already said it will be a preference, but if you go for tier one supplier there will be no there is will be much lower what it’s a the quality is key. So, the ISO summary, there is no more risk of hotspot with this module that any any other size of module another set of cell is at risk and it is compatible and there are no higher risk of Finally, anything is this a course

Unknown Speaker 52:40
to go to try supplier.

Unknown Speaker 52:43
Thank you very much, Antonio. And you know that there is a question for Omar, which is regarding we had it here I think you have answered it. And because all of the other questions are about people wanting to get in touch with all three of you say, Well, of course you can you and some of you have already given the, your details, but Well, let’s have a question for both you, Omar and, and Steve. So, you know, what’s the next then in, in the development of off, you know, high capacity modules. So we have seen, you know, I think Omar, you show that chart that showed how their capacities are getting higher. So I suppose the inverters have to evolve as well. So what’s the the next step?

Unknown Speaker 53:44
So and I mean, should I go and place? Yeah, first order. Sure. So in terms of what we have today on the market, I think our solutions that we have already in the market that have been for the past, let’s say five, six years are already compatible. So the short circuit current We’re able to handle the operating costs we’re able to handle. So as just now, as tuition is that say under control, of course we’re looking at our teams in r&d are looking at the latest developments in the modern world. And we’ll make sure then to match basically this current capacitor the current and operating current for the new generation of modules, as they’re introduced by the manufacturers.

Unknown Speaker 54:27
Thank you, Mark, Steve. Paul, do you have to add to the so what’s next in development of the inverter technology do match? You know, the evolution of of modules?

Unknown Speaker 54:39
Yeah, thank you. So I think we also it’s keep also the following with the tuna solo team, for the productive development and also for this for today like the the six spaniel what also it is like two years ago. We are cooperative with the traders To do it, so, flown in order site, so, the module the calendar is higher. So, this is also can reduce the LCD of the whole fuel plant and for the motor now what is now we are doing for the motor for the next one year to next like five or six years. So, listen in order it is compatible for the next like the germination of the older models development. So, for while we were always in water is just like wine in water fish for Oh, it means so from the different kind of the current so one product, we wanted to cover it and also combined wisdom together. So this is what is our strategists.

Unknown Speaker 55:45
Thank you very much, Steve, and we’ll do my follow up question is regarding the balance of systems. So, you know with high current modules, it’s Is there any Duke costs on the balance of systems increase. For example, my understanding is that cables would have to be of a different specification. So, is there an added cost in terms of balance of systems of using ultra high power modules?

Unknown Speaker 56:15
Yeah brizard on our team, we are analyzing that like the cable quantity, it can be reduced. And also it is maximal to use like the first square meter of the capability of the cables. So definitely for the cable side, the POS it can be reduced.

Unknown Speaker 56:35
Right. Thank you Steve. Antonioni. If you have anything to add.

Unknown Speaker 56:41
No, I mean, it’s similar dndi I mean, you have when you have to compare, you have to compare that now you’re putting 2313 in the place of two. So before you were installing two cables or four millimeters, and now you have to start one given a four millimeters. So that is the obvious the obvious way to say what is the savings Right.

Unknown Speaker 57:01
Okay, good. Well, the following question is from Yeah, it’s on the chat, but we’ll let it go because it seems like a good question. So do you think that silicon semiconductors have space in the future in the future of PV inverters which would be the advantages of using these kind of semiconductors in your inverters or s IC sorry, vi? So I’ll ask the question again.

Unknown Speaker 57:33
Okay, I think already now following orders is already have the silica of the semiconductor it already is in building or in orders. So like the IGBT, and also sometimes

Unknown Speaker 57:48
I think Luis is referring to Silicon carbide technology on the IGBT stock level. Already, of course, looking into that on string level, string inverter But as far as I know, we are already using silicon carbide technology on central inverters. So our stocks, please don’t quote me on this. I’m 95%. Sure, but I’m pretty sure everybody’s already integrated our stocks at the central inverters.

Unknown Speaker 58:19
Thank you. Okay. Thank you very much. Well, I think, like all good things, these webinar must also come to an end. We are approaching the end of the hour allotted hours. So, you know, I’d like to thank our speakers and I’d like to thank everyone who’s been with us here as well, you know, watching the webinar, so would you like to say anything to our speakers that do our viewers sorry, before we leave? Let’s start with you, Steve. any parting words?

Unknown Speaker 59:00
Maybe yeah okay, okay

Unknown Speaker 59:05
so do you have any parting words for our our viewers? We are leaving we’re finishing the webinar very soon

Unknown Speaker 59:14
Okay, I think it’s for me it’s okay. Yes sir. But there is also is a second rematch for this kind of jaunt like a discussion and for the motor future future in orders and also their panels. So what is our effort is to reduce the BRS and also increase the generation and is it better for the LLC deductions. And this is our the gianduia efforts.

Unknown Speaker 59:41
Thank you very much, Steve. Omar, any final words for our viewers?

Unknown Speaker 59:48
Well, from my end, thank you very much for tuning in today. And please don’t hesitate to reach out to one of our application engineers throughout if you need any assistance, and we’ll definitely keep it With with via Trina at insights. Thank you for having us today.

Unknown Speaker 1:00:06
Thank you, Alma. And Tonio.

Unknown Speaker 1:00:10
So thank you, everybody, and thank you for organizing this. Yeah, I would like to just remark that of course, this is a new product, a new way to think I have to be a study to be implemented. We are we in Trina solar, we are really eager to support any project that you may have. We have a group of engineers that can really help you to optimize the plant, because now it’s a bit more confusing. We have different sets of products, different cell size, different currents. So we have a team that can really help to go to optimize your product. We are replaced, right so we are really, really here to support you.

Unknown Speaker 1:00:53
Thank you very much Antonia Omar, and stay for today and thank you to all our viewers. So if you like these kind of Go to eight sys COMM And you’ll see more of them. And right well, thank you very much and until next time, goodbye.

Unknown Speaker 1:01:10
Thank you Carlos. Goodbye. Bye bye

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