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Huawei inverter testing

Huawei inverters are the new kid on the solar block. I first published this Huawei inverter review in May 2018. It gained a bit of attention and some online criticism saying it was not accurate. However, Huawei approached me about this review, and apart from some cheeky comments I made, they graciously agreed with the content and said they were working on improvements.

As I type this update it’s June 2019, I’ve just visited Huawei’s factory in Suzhou, and their R&D centre in Shanghai. Trent, Nicole and I met with the Stephen Zhou, the general manager for residential inverters and we discussed the points in this blog and the road map for Huawei’s inverters. I’ve updated some sections as Huawei have already made some improvements to their inverter since I first published the blog. And I’ve noted the future improvements Huawei told me are to be released over the next 12 months.

 

Who is Huawei anyway?

Huawei’s Headquarters are in Cantonese-speaking China, and in Cantonese, it is pronounced “Wah way”. However, when translating to English, the company chose to write it in pinyin with the Mandarin pronunciation “Hwa way”, so I think we should run with that.

Huawei is pronounced “Hwa way”

The name literally means “Chinese Achievement”. And achieve they have:

  •  In 2017, Huawei overtook Apple to become the second largest mobile phone manufacturer in the world. (The largest is Samsung.)
  • They supply the 4G network for Vodafone, Optus and TPG in Australia.
  • They boast a presence in more than 170 countries. There are only 195 countries in the world.
  • Huawei employs 180 000 people globally. Apple has 123 000 and Samsung have 275 000.
  • Eighty thousand of their employees work in Research and Development. They have 15 Research and Development Institutes.
  • Huawei has 800 employees in Australia.

I could go on and on but… “whatever”. That’s in telecommunications and other industries. What do they know about solar? In 2015, 2016 and 2017, and 2018 Huawei shipped more solar inverters worldwide than any other manufacturer. (Measured by total inverter output capacity). Drop the mic Huawei!

 

The apparent game changer

The reason this new Huawei Solar SUN-20005KTL is creating so much hype is that at first glance at the Huawei inverter specification (see it here) does everything we ever wanted an inverter to do.

  • It’s a “battery ready” inverter at an affordable price.
  • It can connect to the reputable LG Chem battery – like SolarEdge.
  • We can install it without optimisers for affordability as a standard string inverter – like Fronius.
  • We can selectively install optimisers on shaded panels only – like Tigo
  • Or, we can optimise all panels – like SolarEdge.
  • It’s got an inbuilt IV curve tester – like nothing before!

But does Huawei’s inverter actually deliver on what they promised? Read on.

The Huawei Solar inverter reviewed

Optimisation

Huawei optimiser

Inside a Huawei Solar optimiser

There are three things I like about the Huawei Solar optimiser solution. Its electrical simplicity, its selective deployment and its flexible string voltage.

Electrical simplicity

The job of an optimiser is to adjust the panel voltage depending on the sunshine and shading so that the current in each panel is equal. This allows us to achieve maximum power from the system. In the case of SolarEdge, the voltage continuously decreases and increases, or “boosts and bucks”. The Huawei Solar optimiser only bucks the voltage of poorer performing panels in order to increase to the current of the higher performing panels. The Huawei inverter then boosts the voltage as appropriate. In theory, this means simplicity and reliability on the roof.

Selective deployment

A term that I borrowed from Tigo, “selective deployment”, allows us to save on the cost by only installing optimisers on the panels that are going to be affected by shade.  The optimisers cost around $80 each. So if you had ten panels that were not affected by shade, you could easily leave ten optimisers off and save $800.

Flexible string voltage

The Huawei Solar optimiser solution has another significant advantage over Solaredge. The SolarEdge HD wave inverter works on a fixed voltage of 380V. This means that the string of panels must add up to 380 volts in every situation. However, each optimiser has a boost voltage limit, which is usually 60 volts. In some cases, this means the SolarEdge optimiser is not capable of boosting high enough to compensate the current of the lower performing panels. This results in the lower performing panel actually dragging down the other panels in that string.

The Huawei inverter, by contrast, has a variable input voltage and can work as low as 90 volts. The optimisers only work if there is shade or if panels are installed in multiple orientations. This, in theory, will result in better reliability, and we will avoid the losses that can happen with SolarEdge blocking.

 

The Huawei inverter Safety Box

 

In order to have “rapid shutdown” and panel level monitoring, Huawei inverters currently require the use of a “safety box”. I prefer to call this box Henry after our Octopus friend from The Wiggles. It might be hard for you to picture what it looks like installed, but it’s about 150mm square with eight legs. Four connectors plug into the DC isolator and four that plug into the inverter. Once installed, it looks more like Henry break dancing below the elegantly designed Huawei inverter. Surely they could have built this into the inverter!

Huawei agrees with me that the safety box needs to be built in and the next edition of the Huawei inverter (sometime in 2020) will do exactly that. 

 

The Huawei Solar Battery Solution

One of the biggest attention grabbers about the Huawei inverter is that it is a hybrid inverter. This just effectively means that it has a battery charger inside the inverter. What is even more interesting is that they chose to couple with one of the most reputable batteries on the market – LG. However, there is another tiny, weeny problem that the R&D team overlooked. It does not have an Emergency Power Supply mode (EPS). Your lights will not stay on in a blackout.

 

“Whoop dee do dah!” say Huawei Solar.
“How often do most people lose power anyway?”

But that’s not the point – at least it’s not the point in Queensland. In Queensland, we need three reasons to justify to ourselves why we would waste ten grand of our hard earned money on a battery.

  1. Return on investment. Without mainstream “time of use” charges in QLDand with feed-in tariffs up to 20 cents, a $10 000 battery will take you over ten years to pay off. So we need more reason.
  2. Blackout insurance. Imagine you lost power in the middle of Friday night footy. Let’s say that happened twice in the next ten years. Most blokes could justify a couple of grand a game to know they would still get to watch the footy while the neighbours brought around the beers.
  3. Bragging rights at the pub. You could probably justify another grand just there – until you tell them you didn’t get the Friday night football blackout insurance package.

Seriously, if a customer is going to make a discretionary spend of $10 000 on a battery in Qld, it’s not purely a financial decision. The battery needs to have the ability to run in a blackout.

Huawei acknowledges that the Australian market wants EPS but Huawei, like many other manufacturers, overlooked this market demand. They assured me there are major changes coming to the battery situation in 2020 which will include EPS.

 

IV Curve Diagnosis

Last year I went to a solar trade show in Munich. The real WOW factor for nerds visiting the Huawei Solar stand was that their upcoming 5kW inverter had an inbuilt IV Curve tester. An IV tester can accurately find a degradation fault within a panel. To put this in perspective, about five years ago, I geeked and bought an IV Curve tester for fun. It cost me about $10 000, and it was a pain in the neck to set up and use.

Now the Huawei SUN-20005KTL can apparently generate an IV curve with just “one click”? Geek me out!

In the previous version of this blog, I complained bitterly because Huawei told me the IV curve function was now not going to be available for residential inverters. As I type this update, I’m in China visiting Huawei’s factory. I just met with Stephan Zhou, Huawei’s general manager for residential inverters. I explained to him why having the IV curve function in residential inverters would be awesome. So, Stephen said he would make it happen – and it will be available by the time I get back home! For free!

I can’t wait to play with it, and I’ll update here once I have.

(For commercial inverters,  you have to pay a small subscription to have the IV function available.)

 

Huawei Inverter Monitoring Platform

 

In the earlier version of this blog, I complained about Huawei’s monitoring platform. Huawei of all companies should have an online monitoring platform sorted. And now they have. It’s now a platform worthy of the tech giant’s great name. The platform really shines when you have the safety box (Henry) connected to the inverter and Huawei optimisers on every panel. The level of historical data and ease of use of the platform is impressive. It has an impressive user interface and displays all of the historical data clearly and simply. It leaves the glitchy lacklustre SolarEdge monitoring platform for dead. Having in-depth panel and inverter information on the one platform is also more elegant than using both Tigo and Fronius monitoring.

 

The Huawei inverter specifications

Voltage restrictions

At the time of writing, the Huawei 5kW inverter is restricted to 500 volts input if you connect it to the current LG battery. Huawei advises me that changes are coming and the battery will soon be able to handle 600 volts. So if you are choosing the Huawei inverter to be “battery ready” then Huawei should have solved the problem by the time you go to purchase a battery.

But forget about installing the Huawei with the LG battery solution as it stands today – because this 500-volt restriction will mean significant power restrictions.

Power restrictions

When we install a solar system without a battery, we are limited by the 33% oversize rule (6.6kW of panels on a 5kW inverter). This regulation was introduced to prevent us from claiming the STC’s on panels will rarely be able to perform to their maximum potential (e.g., installing 10kW of panels on a 5kW inverter).

However, when we install a solar system with a battery, we can legally install as many panels as the inverter manufacturer allows. Installing 10kW of panels on a 5kW inverter with a dc coupled battery is not uncommon. This is because you can use any excess power (that would have otherwise been clipped at 5kW by the inverter) to charge your battery. It’s a financial no-brainer to install more than 6.6kW of panels on your 5kW Huawei inverter.

So how many panels does Huawei currently allow you to install on their hybrid inverter/LG battery? Bugger all. Because of the 500 volt limitation of the LG battery, we have to reduce the number of panels per string. So we’ll choose a higher wattage panel for best results. For example:

  • 20 x 330W QCell panels on the Huawei inverter + LG battery = 6.6 kW. That’s undersized for a battery system.

Huawei advise me they are sorting out this 500-volt limitation, but when that happens, the maximum power oversizing they will still be 7.5kW of panels on their 5kW inverter. 7.5kW hours of solar may be enough for people who don’t use a lot of power, But If your home uses a fair bit of power during the day, 7.5kW of solar may not be enough to fully charge an LG 10kWh battery every day – particularly on rainy days.

Current restrictions

The Huawei inverter has a tiny 11 amp input current. That’s fine if you have a spacious roofline and can put panels wherever you like. But if your roofline is a little more complicated, you won’t be able to parallel strings with standard panels because the current will be over the 11 amp input limit. Huawei tells me they are looking into increasing the current limitation for their next version of their single-phase inverters If they do, that will make the inverter a much more interesting solution.

If however, your roof has significant shading, so you install optimisers on every panel, you won’t need to parallel your strings. (I only recommend optimisers for shaded panels: history has taught me that putting power electronics on the roof for no good reason is just opening yourself up to the possibility of failures.)

 

The Huawei inverter build

The Huawei inverter is a smart looking unit. When you look under the hood, it appears solid – I would suggest it appears better built than the new SMA.

This statement from the user manual is just a tad concerning.

Do not install the SUN2000L outdoors in salt areas. A salt area refers to the region within 500 meters from the coast or prone to sea breeze.

Huawei explained that this is really just a reflection of the standards they were required to test to. In June 2019, Huawei was performing further accelerated testing to a higher standard so they can remove this ridiculous 500m restriction. Currently, Huawei will permit you to install closer to the beach on a case by case basis.

Sea breeze or not, the Huawei inverter specifications claim the inverter has “natural cooling”. I’ve shown in other blogs, that when SMA and ABB say “natural cooling” they are just kidding. The SMA and ABB inverters have internal fans. But it was nice to see that when Huawei says “natural cooling” they mean “no fan”. An internal fan in an inverter is considered a weak spot – another moving part. But if you don’t install a fan, the concern is high temperatures will shorten the life of the capacitors. However, Huawei claims their secret to cooling the inverter is in component placement and how they use the entire case of the inverter as an effective heat sink.

This is why the Huawei inverter specification states:

“Burn Warning. Do not touch a running SUN2000L because the shell is hot when the SUN2000L is running”.

Well, that’s a tad concerning – or is it?

Huawei smoke test

Huawei Solar inverter thermal imageOut of curiosity, I ran 6.6kW of panels into the Huawei inverter and even paralleled a string to see if I could make it smoke. I got it up to 55° internal. The hottest the case got to was 43.4°, which is just warm to touch. Keep in mind this was in an air-conditioned office rather than a 40-degree day.

I asked Huawei about the burn warning while in their factory in China. They said at 45 degrees ambient temperature, the front of the inverter will get up to 60 and the back will get up to 70. I got out my frypan and heated it to 70 degrees. At 70 degrees, you’d have to deliberately hold your hand there to get burnt. Fair to say that Huawei is being a bit over-cautious with their warning. But don’t be surprised on a hot day if the inverter is hot to touch. On the positive side, natural cooling means you don’t have the problem of fan noise. Noisy fans can be an issue for Fronius inverters when instaled, for example, in a home office.

 

Conclusion

Huawei is an impressive company and has lived up to its name “Chinese Achievement” by not only gaining a large share of the telecommunication industry but by dominating the solar inverter market internationally.

If you’re looking for a quality inverter for a simple roof with shading on a few panels, then the Huawei SUN-20005KTL inverter is a good option – but Fronius and Tigo will give more flexibility.  If you have heavy shading and need optimisers on every panel, Huawei becomes more interesting. While the safety box is an ugly addition, it is an affordable solution. The safety box gives you a pretty powerful all-in-one platform for monitoring individual panels. It enables rapid shutdown, and now it even offers IV curve testing! But because I only recommend we install optimisers for shaded panels, full deployment is fairly rare.

However, if you want a hybrid inverter or your roof is more complicated, then Huawei has significant limitations (unless you purchase optimisers).  When installed with a battery, the system won’t run in a blackout. The current pairing with the LG battery is useless because the battery voltage limitation restricts the number of solar panels you can install to charge the battery effectively. The inverter’s current limitations make it pretty inflexible. Huawei’s say their upcoming products will solve all of these issues. If they do, I’ve don’t doubt Huawei will have a secure place in the solar industry for years to come.

 

37 Comments on Huawei Inverter Review – the good & the bad.

Ivan said : Guest Report 3 weeks ago

If an inverter gets as hot as you wrote it here, I'm assuming it will reduce the inverter's lifetime, and I think the inverter will derate and give less power at higher temperatures. Then I would prefer an inverter with active cooling. But also to my information Huawei claims natural cooling for the bigger inverters, but also have fans inside. For me Huawei inverter only look great on the data sheet, but I do not expect, that they run very well in their natural habitat, especially at higher ambient temperatures.

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bruce said : Guest Report 3 weeks ago

if the inverter gets to 70 degrees I wouldn't go near it

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Mark C said : administrator Report 4 weeks ago

Hi Andrew. I'm working on this Enphase blog atm. Here's a sneak peek! https://mcelectrical.com.au/blog/micro-inverters/

Andrew said : Guest Report 4 weeks ago

Agreed on the undesirability of RHI's! I guess the Aussie Standards don't recognise "rapid shutdown" at the panel level. I've got a hunch that in a future version, the standards people might make RTI's non-mandatory if you install panel-level "rapid shutdown". Do you reckon the Huawei safety solution (and the Tigo etc equivalent) provide a good, safe solution to the issue that RTI's were trying to address?

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Mark C said : administrator Report 4 weeks ago

Hi Andrew. Unfortunately not. If you could then I'd be doing full deployment everywhere!! :) The installer reference group is pushing hard to eliminate RTI's.

Leon Balym said : Guest Report 4 weeks ago

Hi Mark, Just asking what your thoughts are of the Enphase System with IQ7 micro-inverters?

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Andrew said : Guest Report 4 weeks ago

Hi Mark - I know you don't advocate "full deployment" of optimisers, but if you do this on a Huawei with a safety box added, can you omit the rooftop DC isolator?

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P said : Guest Report 4 months ago

Hi Mark very in depth review. I note this page https://www.solar4ever.com.au/batteries.php and this advice ------------- Let's say you are trying to decide between a Fronius Primo and a Huawei hybrid. If you buy the Primo ($2,220 installed) then you know that it will cost you $12,000 to add the Tesla Powerwall 2 later, making the total cost $14,220. If you buy the Huawei it will cost $1,800 (installed) and then $8,800 (installed) for the LG battery and $350 for the installed smart meter, making a total of $10,950. That saving of $3,270 is why so many people are choosing hybrids now when they are buying a complete NEW solar install. The real beauty is that you are paying no more upfront, in fact a little less, so if you never install batteries you don't lose out, and if you do, you have the same choice of plugging in whatever the hybrid works with or any of the 'AC Coupled' solutions like Powerwall. ------------- They are obviously impressed with the Huawei but your review leaves several short comings and a dont buy . However the above link / site listed says ------- MC Electrical in Queensland, a solar company we have a great deal of time for, wrote a review on their website shortly after Huawei first released their residential hybrid in January 2018. Mark's review was pretty accurate back then, but the steady stream of Huawei upgrades has answered every criticism. -------------------------------- Is this true has Huawei now a year later in March 2019 answered your criticisms? do you have a fresh review post? thankyou

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Mark C said : administrator Report 5 months ago

Hi Shishir, To be honest, I don't really know. I didn't find evidence of it running too hot, but I certainly test it at 45 degrees.

Shisher Shrestha said : Guest Report 6 months ago

Hi Mark, Congratulations on a great review. We are looking at Huawei's inverters for commercial rooftop projects that we plan to install in Nepal. The ambient temperature in some regions may get as higher as 45 degrees centigrade and I am a bit concern about their cooling system. I am looking forward to your comments. Thanks

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Mark C said : administrator Report 8 months ago

Thanks, Robert - fixed. The IQ 8 is going to be huge. We're looking into doing some off-grid projects on the in Vanuatu. The problem for us with the Enphase battery is it can only ever be AC coupled. Regulations at the moment make us allow inverter and battery capacity together, so on single phase that's only 10KW of batteries and solar inverter. It's just not nearly big enough for even a small home.

TJ Roberts said : Guest Report 8 months ago

Very informative article. f.y.i. SolarEdge hyperlink was broken. Still prefer Enphase IQ micros for the 2-wire simplicity, panel-level monitoring, multiplicity giving reliability, and low-voltage DC-to-AC conversion for longevity. Waiting on the IQ8 ACM's allowing a battery-less microgrid solution.

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Mark C said : administrator Report 8 months ago

Hi Gustav, Yes, I was testing a single phase inverter. I'm not sure what Huawei does in the 3phase and optimisation. I do know they are working on fixing the problems I addressed, so hopefully time for an update soon.

Gustav said : Guest Report 8 months ago

Hey Mark. Great blog, read a lot of your posts. When trying Huawei optimizers, did you try them on a single phase-system? I've heard the Huawei optimizers are only for single phase inverters. Can you confirm this? In many of your posts you seem to be adressing one phase-systems, would help us readers if you'd be more detailed if the example of a system that you're adressing is a one phase system or three phase system. In Sweden where I'm installing solar systems one phase systems above 3 kW aren't allowed by many of the grid operators, so here mostly all solar systems installed are three phase systems.

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Mark C said : administrator Report 11 months ago

Hi Luke, I don't think Henry is available yet. I definitely wouldn't go with SolarEdge - my concerns about them have grown after a ridiculous number of installers have contacted me and had similar or worse complaints. I would use Tigo optimisers and a Fronius inverter. I'm in the middle of testing them and all the feedback I hear about them is Tigo really reliable - that blog will come out in a few weeks.

Luke said : Guest Report 11 months ago

Hi Mark, Any update on Henry-the-Octopus? Do you have one? Does it work? I've got a situation (some winter shading to the NNE thanks to a neighbour's tree, clear sky to the WNW, flat roof) where the ability to have optional optimizers on only some panels appeals. What would you recommend if not Huawei? Should I look into SolarEdge despite your recent concerns? Thanks for the thorough reviews, the most informative I've found. Regards, LR

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Esmail said : Guest Report 11 months ago

Thanks Mark, you offer an educational blog that every CEC installer should visit and learn from your time consuming reserch and the updates that you follows up, and thus we benefit by avoiding the mistakes that we can make in the product selection We are grateful and many thanks you and team Esmail of Solar Hybrid Solutions

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Lothar said : Guest Report 12 months ago

HI Mark, Thanks, I'd definitely like to pop round and have a listen. I see you are in Eagle Farm? I work the normal 9-5, what hours would I be able to pop round? If its noise is not a problem for me, I may consider taking it off your hands if you are still wanting to pass it on.

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Mark C said : administrator Report 12 months ago

Hi Lothar, I do remember hearing a noise when we had it running. It didn't bother me. We could connect it back up and run it if you want to drop around sometime and have a listen.

Lothar said : Guest Report 12 months ago

Hi Mark, I have a mate who has one of the three-phase Huawei units and says it emits a very loud 8000Hz ring, that even with it in the garage and all doors and windows closed could still be heard inside. They even stuck soundproofing foam on it to try dampen the sound. Despite the shortcomings you list. I'm still interested in getting one of the 5kW single-phase ones for my house. BUT I need to know if it emits any high-frequency noise. I'd really like to know if you notice any noise from yours and whether you could use one of them phone apps to check the sound from it while it is running. I cannot stand high pitch ringing. Or could you put me in touch with someone in Brissy who has one of these operating? Much appreciated.

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James said : Guest Report 12 months ago

Another great review Mark, cheers!

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Mark C said : administrator Report 12 months ago

Thanks Josh. I'll have a look. I'm looking forward to testing Henry.

Josh B said : Guest Report 12 months ago

Hi Mark, Just letting you know the new NetEco website has been updated. Looks very useful compered to the last version. heaps of custom comparisons.

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Mark C said : administrator Report 12 months ago

Hi Auston, Thanks! Great to get a perspective from a previous insider! The old "promised features that are never released" trick, eh? I haven't even looked at the commercial inverters.

Auston Taber said : Guest Report 12 months ago

Hey Mark, I worked at SMA for 6 years and then at Huawei for 1.5 in the US as one of their service managers. I can attest to the durability of the hardware, probably one of my favorite inverters to have personally handled. The software side, and the promised features that were never released was a huge issue for me. You really hit the nail on the head with this review. I was never able to see the resi model, but the commercial units paralleled your review exactly. Pretty impressive review. Thank you.

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Mark C said : administrator Report one year ago

Hi Fred, No Fronius Do not have an IV curve test inbuilt. This feature is unique to Huawei as far as I know. I'm not sure I get the second part of your question, but Fronius seems to do a good job at cooling with the Fans. The fans also seem to be reliable to me. (Have a read of my recent Fronius blog. https://mcelectrical.com.au/blog/fronius-inverter-review-primo-symo/)

Fred said : Guest Report one year ago

Mark, I have some questions: do you know if Fronius models have IV curve diagnostic? Is it possible to you compare resources to failure investigation between Huawey and Fronius models used to commercial necessities? I saw Fronius speaking well about the advantages of the its active cooling in comparison with passive cooling of the Huawey. What you think? Thank you!

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Mark C said : administrator Report one year ago

Hi Andrew. Because Solaredge has a fixed voltage they can overcome this. Other inverters could have a higher input current. With Huawei, it's a lose/lose. Changing to 600v will only improve it marginally. It will be interesting to play with Henry when he comes :)

Andrew said : Guest Report one year ago

Thanks Mark. Hopefully LG will upgrade their DC isolator beyond 500V soon. I presume the same issue applies to ANY inverter trying to use the LG battery, not just Huawei? EPS not an issue in Perth (ultra stable supply here) and no word in Huawei's reply to me about when its coming. Completely understand that SA, QLD and other places with frequent power outs would want it. Henry the Octopus and updated NetEco software should be here end of August..can't wait to check out the IV Curve tester.

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Mark C said : administrator Report one year ago

Hi Andrew. Thanks for forwarding this on to Huawei. I was in talks with them and met them as I was writing the blog. They knew that I was blogging about them and I made a big deal about my issues to make sure I got the best information from them. I didn't really trust the advice I got. (For example, they also said there are no capacitors in the optimiser, which there clearly are). The reason for the limitation is the DC isolator in the LG can only handle 500v. We confirmed this was the case with LG during an LG training session. I'm meeting with an investor in Israel to discuss this blog on Tuesday, and have talked to another one in New York. Huawei is clearly making waves and has good reason to get the safety box working. However, It was announced last week they are being sued by SolarEdge. They almost exactly copied the SolarEdge optimiser. Interesting times!

Andrew said : Guest Report one year ago

Hi Mark. I forwarded your Huawei review to Huawei Australia for comment and this is an abridged version of their reply.... 1.The Smart Safety box is working very well to build the communication between panels and inverters. NetEco monitoring app is being updated for panel monitoring now, orders have been placed by One Stop Warehouse for delivery within 2 months. 2. We have EN60068-2-52 Type D certification to prove our IP65 against salt-mist nearby the sea, we also have some projects nearby the sea (Japan). 3.The cover temperature is quite high because we are using a metal material, but the inside temperature is much lower as we have patented natural cooling design. The warning on the label is normal. It does not mean we have a bad cooling system. Mark... I have also asked them to further clarify their answer regarding the max input voltage per string of 495V when LG battery connected. At the moment they simply say... The max input voltage will be decreased from 600V to 495V due to LG battery limitation we have marked it in the datasheet. I'll let you know the reply. However, with a typical 275W panel having a VOC of 34.9V at STC, and a VMP of 28.3V, and a more realistic voltage closer to 26V, I am struggling to see why you can't put 14 panels on a string anyway? Perhaps you can explain?

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Mark C said : administrator Report one year ago

Hi Will, Thanks! The Sungrow Hybrid can also only take 1 string per MPPT, but the voltage input is 600v, so we can string 13 or 14 panels into one input (depending on the panel.) How do you work it out? I'm taking a long flight to Israel next week, and on the plane, I'll be writing a blog to answer that question :) My impression of the solax is that it is junk, but haven't looked at it for a long time. It's on the "to Blog" list.

Will said : Guest Report one year ago

Hi Mark, thanks for the very informative review. I also read/watched your review on Sungrow hybrid inverter SH5K+. I would like to know how many standard panels can you put on each string/MPPT on the Sungrow SH5KT or Fronius Primo 5kw (international version)? How do you work it out? Also can you parallel into one input (MPPT?) if using the Fronius or Sungrow? What do you think about the Solex x-hybrid gen3? Many thanks.

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Mark Cavanagh said : administrator Report one year ago

Hi Stephen. I wrote a blog a while ago now on Redback. I had a lot to do with it back then, working with them on battery warranties and giving feedback on their product etc. Redback was flawed from the beginning. In Phil Livingstone's own words, they "are a software company - not a hardware company". They are trying to create all these futuristic head in the sky type things, but they have missed the fundamentals of having an inverter that actually works.

Stephen said : Guest Report one year ago

Hi, What do you think of Redback smart hybrid inverter? Regards

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Mark Cavanagh said : administrator Report one year ago

Hi Terry, no, it is available now as their website says ..... http://solar.huawei.com/au/residential .....(The image with the house says the safety box was available in q1 2018.) ..... ........ I've talked with 2 wholesalers who are selling them and have heard others in the industry who have installed them too.

Terry said : Guest Report one year ago

Hi Mark, Seeing as you've had this inverter for three months is it possible you were testing a very early release as I understand it's not being released until Q1 2019.

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