Longi Solar solar panels reviews

Based on 266 ratings Aus Ranking

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About Longi Solar, Solar Panels

Longi Solar solar panels review

Longi Solar is a Chinese company that is a tier one manufacturer of solar panels.  They only produce monosilicon panels and may be the largest monosilicon solar panel manufacturer globally.  Their panels come with a 10 year product warranty. Longi Solar's Australian office can be reached for warranty support or assistance on 02 8484 5806.

Longi Solar Production

Longi Solar was the world's fastest growing solar manufacturer in 2016 and has continued to grow rapidly since.

In 2019, it shipped 7.394 GW of cells and modules, an increase of 23.43% over 2018. By the end of 2019, Longi reached 42GW of monocrystalline silicon wafer and 14 GW of mono panel production capabilities.

Longi is a member of the "Silicon Module Super League";  which a small group of companies that account for the majority of the world's solar panel production.

Most of Longi's production had been used in China, but the firm has been expanding into overseas markets and their panels are becoming a more common sight on rooftops in Australia. In 2019, its overseas shipments grew 154.59% year over year.

Company History

Founded in 2000, by 2007 Longi boasted 100 tonnes of monosilicon production capacity - enough for approximately one gigawatt of solar modules these day. In 2007, it was likely less, as silicon ingots were still being cut into the thicker "toast" slices instead of the thinner "sandwich" type silicon ingot loafs they do today. These days, ingots are cut so thin, there's only approximately half a gram of silicon in each solar cell.

Longi shipped 2.5 gigawatts of silicon wafers in 2014, which are slices of silicon ingot before they are turned into solar cells.  2014 was also the year Longi stopped producing silicon ingots and wafers exclusively and expanding into solar panel manufacturing by buying Lerri Solar.

After acquiring Lerri Solar, which had been making solar panels since 2007, Longi continued to produce panels under the Lerri name until early in 2017 when the company rebranded as Longi Solar.  Longi may have held off on the rebranding to ensure panel reliability was up to par before associating the Longi name so closely with them.

From 2014 to 2016 Longi expanded rapidly.  Fortunately this success did not lead to them becoming arrogant and developing a Longi 'tude. 

Longi Headquarters

Longi is headquarted in Xian, or Xi'an; which located in Shaanxi Province, but Longi says on its website this city is located in the neighboring Shanxi Province.  Somehow the company confused Shaanxi and Shanxi when writing about themselves in a foreign language.  I can't imagine how that happened.

Longi is headquartered in Xi'an rather than further south near Shanghai where the majority of the world's solar panels are made because they began operations as a silicon manufacturer.  Monosilicon production requires a great deal of electrical energy, so they were founded in an area with access to cheap coal power.  Fortunately, China is taking steps to reduce their coal use and one of them is a massive build out of solar capacity. In March 2020, Longi committed to sourcing 100% renewables-based electricity across all its operations by 2028.

Overseas Production

In addition to their Chinese factories, Longi expanded production overseas.  Longi constructed a factory in India with the ability of manufacturing 500 megawatts of solar panels annually.  The facilility is situated in the Special Economic Zone (SEZ) in Sri City in Andhra Pradesh.  The factory employs 1,000 people, which is a significant number for a 500 megawatt plant these days, but as wages are lower in India compared to China, it's not unusual to be hiring more staff than they would back on their home turf.

Longi has also purchased a facility in Malaysia capable of 500 MW of solar panel capacity a year . The plant will ship in silicon ingots, slice them into wafers, produce solar cells and panels, and then melt all the waste silicon to produce new ingots on site.

Longi Makes Monosilicon Exclusively - No Polysilicon

There are two types of silicon used in the production of solar cells -- polysilicon and monosilicon.

Polysilicon is comparatively easy to make.  The molten silicon is poured into a mold and allowed to cool.  It's quick, easy, and there's little in the way of waste.  Its disadvantage however, is it is made up of multiple crystals of silicon; which impacts on the efficiency of solar cells.

Monosilicon is significantly more difficult to produce and consequently more expensive, but the process results in a single large crystal of silicon, enabling solar cells be more efficient.

Longi only makes monosilicon and is the world's largest producer -- at least in respect to ingots.  They own a massive number of specialised slow cookers called crucibles that bake and rotate at the optimum rate to produce cylindrical ingots of silicon using the Czochralski process.  Ingots used for solar cell production are typically 10 to 20 centimeters across.

The crucibles, which reach temperatures of 1,425 degrees Celcius, are usually made from quartz which has a melting point of 1,713 degrees Celsius.

Longi's Vertical Integration

As Longi produces silicon ingots, wafers, solar cells and solar panels, they are considered a vertically integrated company.  While this provides the company a secure supply of silicon, there is potential that by making the company larger, it becomes more cumbersome and less able to react to sudden changes in solar technology and the market.

Monosilicon = Efficient Panels

As monosilicon enables panels to be more efficient in converting sunlight to electricity than polysilicon, Longi Solar panels have reasonably high efficiencies. Their 60 cell panels, which are likely to be used on Australian rooftops, have efficiencies ranging from 17.4% to  20.3%.

Longi is a participant in China's Top Runner Program, which is a government scheme with a goal of boosting the efficiency of Chinese solar panels.

Multiple Records Set

Longi has achieved a number of records for solar cell efficiency in the last few years, and this drive to achieve recognition for its research and development efforts is something that benefits us all. As one manufacturer sets a record, another breaks it - and the cycle goes on. While these are often just incremental improvements, a number of them together make for significant progress.

Risk Of A Monosilicon-Only Approach

With a sole focus on monosilicon and owning so many dedicated monosilicon crucibles means Longi is potentially running the risk being saddled with a great deal of outdated expensive equipment if there are significant declines in the cost of silicon production using other methods.  However, as solar production is expanding very, very quickly; even if more economical methods do appear, old and new technologies could coexist for a significant period.

Longi Performance Warranty - Better Than Average

Most tier one solar panels at the lower end of the pricing range only guarantee around 80% of their originally rated power after 25 years.  But Longi promises their standard panels will still produce at least 83.1% of their original output after this time and their PERC panels will provide at 84.8%. 

With a little luck, other lower cost tier one panel manufactuers will feel confident enough in their engineering to bump up their performance warranties to being them in line with Longi's.

Warranty procedure for orphaned Longi customers

If you have purchased Longi panels from a solar installer who has since gone out of business, the responsibility for warranty claims shifts to Longi as the manufacturer. Their Australian office can be reached on 02 8484 5806 - affected customers should contact this line for assistance. Longi have advised that customers will be asked to send through photos and serial numbers of affected panels to an email address that they will provide, and they will then arrange for the replacement of the panels. If required, Longi will be able to recommend installers to carry out the work if a customer is unable to organise one themselves. They will also reimburse customers for labor costs involved with replacing the panels.

Recommendation

Longi panels are tier one and so should be reliable.  As a result I would not have a problem with installing them on my roof.  They will also appeal to people who are interested in panels that should lose little in capacity over the years, but don't want the expense of purchasing premium panels.

While many companies have run into financial difficulties after rapidly expanding, Longi's financial position appears reasonably sound.  While I don't have any solid evidence, I suspect they will be around for a longi time.  I can feel it in my gut.  Specifically, my longi intestine.

Longi Solar Solar Panel Reviews

Bought From: Quick Fix Solar and Electrical Pty Ltd Show additional information
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Bought From: Platinum Solar Designs NSW Show additional information
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Bought From: Ahlec Pty Ltd Show additional information
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Bought From: Formosa Electrics Pty Ltd Show additional information
Bought From: Ahlec Pty Ltd Show additional information
Again, although they appear to be performing well, the true test will come when the warmer months and longer days return.
Bought From: Electrics Plus WA
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Bought From: Solstra Residential Show additional information
Bought From: Lightning Solar and Electrical Show additional information
Just got them over 3 months solar production is optimum.
already got credit refunded from AGL.
HAPPY WITH THE LONGI PANELS.
Bought From: Solar Power Nation
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also performing well
Bought From: Lumax Solar Pty Ltd
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Bought From: Quick Fix Solar and Electrical Pty Ltd Show additional information
Look very neat on the roof.
Bought From: Electrics Plus WA
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Bought From: Red Giant Solar VIC Show additional information
Bought From: Solar Tactics Show additional information
Bought From: Green Solar Show additional information
Good
Bought From: Lightning Solar and Electrical
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Bought From: Formosa Electrics Pty Ltd Show additional information
Bought From: Elite Power Group Show additional information
Bought From: Solargain Brisbane Show additional information
Work really well and have not had any problems.
Bought From: Formula Sun
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Bought From: Space Solar Central Coast Show additional information
Bought From: Always Solar Show additional information
Bought From: Green Wiring Show additional information
Bought From: Sunlogics Show additional information
Bought From: Greenultimate Pty Ltd Show additional information
Bought From: Green Solar Energy NSW Show additional information
got 16x 350w panels
Bought From: Green Choice Electrical
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Bought From: Green Wiring Show additional information
Great
Bought From: Quick Fix Solar and Electrical Pty Ltd
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Bought From: Green Wiring Show additional information
Bought From: Expert Electrical Townsville Show additional information
Bought From: Impact Energy Show additional information
Bought From: Sungold Solar Show additional information
So far so good with the panels. No issues at all. Doing the job just fine!
Bought From: Essential Solar East
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Bought From: SEM Brisbane Show additional information
Bought From: Yello Energy Group Show additional information
I am pleasantly surprised at how much they produce (we have a meter that reads the smartmeter and can tell us what is being produced in real time) even on partly overcast days
Bought From: Essential Solar East
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Bought From: Ahlec Pty Ltd Show additional information
So Far so good.
Bought From: Solutions Solar
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Bought From: Perth Solar Force Show additional information
Bought From: Uni-Industries Show additional information
Bought From: OneTeam Energy Pty Ltd Show additional information
Bought From: Electrics Plus WA Show additional information
Bought From: Electrics Plus WA Show additional information
Bought From: Green Wiring Show additional information
Bought From: iGreen Energy Show additional information
Bought From: Ahlec Pty Ltd Show additional information
Bought From: Perth Solar Force Show additional information
Bought From: Integra Solar Show additional information
Again bit early to rate
Bought From: Formula Sun
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Bought From: Space Solar Sydney Show additional information
The look good!!!
Bought From: Skylight Energy
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Bought From: SEM Solar Show additional information
Bought From: Solar Tactics Show additional information
Apparently they’re an entry level panel but honestly they look great. I opted for the black framed 315w and couldn’t be happier.
Bought From: Quick Fix Solar and Electrical Pty Ltd
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Still early days so can't rate.
Bought From: OneTeam Energy Pty Ltd
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Bought From: DQ Electrical Pty Ltd Show additional information
Bought From: Essential Solar Show additional information
Bought From: Essential Solar Show additional information
Bought From: Resinc Show additional information
Bought From: Electrics Plus WA Show additional information
Bought From: Solar Fusion Solutions Show additional information
Bought From: SolarBright Show additional information
Bought From: Green Solar Energy NSW Show additional information
Bought From: Essential Solar Show additional information
Bought From: Formosa Electrics Pty Ltd Show additional information
Bought From: Resinc Show additional information
Bought From: Formosa Electrics Pty Ltd Show additional information
Bought From: Resinc Show additional information
I hope they will be fantastic but still waiting to see how they perform as only just installed.
Bought From: Adapt Energy
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Bought From: Ahlec Pty Ltd Show additional information
Bought From: ShineHub Show additional information
So far so good, however, as we have only had it installed for one week, it is too soon to tell.
Bought From: Ahlec Pty Ltd
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They look good.
Bought From: Green Energy
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Bought From: Formosa Electrics Pty Ltd Show additional information
Bought From: Resinc Show additional information
They look fantastic.
Bought From: Resinc
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Bought From: Resinc Show additional information
Bought From: Resinc Show additional information
Awesome and very efficient!
Bought From: Lumax Solar Pty Ltd
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Bought From: Resinc Show additional information
350W panels
Bought From: Resinc
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Bought From: Energeniq Enginering Show additional information
Bought From: Essential Solar Show additional information
Bought From: Resinc Show additional information
Bought From: SEM Brisbane Show additional information
Bought From: Essential Solar Show additional information
Bought From: Resinc Show additional information
Bought From: Resinc Show additional information
So far no problem.
Bought From: Australian Solar Access Pty Ltd
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Again, too early to really judge performance
Bought From: Essential Solar
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Very happy, no issues.
Bought From: SEM Brisbane
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Performs very well.
Bought From: SolarBright
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A recent hailstorm with golf ball sized hailstones, although inflicting significant damage to my car, failed to damage the panels. Very reassuring.
Bought From: Solar Tactics
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Bought From: Formula Sun Show additional information
Bought From: SEM Solar Show additional information
Bought From: Nationwide Solar Show additional information
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Bought From: SolarBright Show additional information
Very reliable, consistent power production, even in low light conditions. My last electricity bill was a credit note for eleven dollars something.
Bought From: Lumax Solar Pty Ltd
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The panels installed, had the optional black surround. The solar cells are not the usual square looking ones. They are very smart looking.
Bought From: Ahlec Pty Ltd
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Bought From: Ahlec Pty Ltd Show additional information
Excellent
Bought From: Dan the Solar Man Angle Vale
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only 1 day old!
Bought From: Ahlec Pty Ltd
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Bought From: Sunterra Show additional information
Have installed at 2 properties. Very good output
Bought From: EFS Solar
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Bought From: Essential Solar Show additional information
Bought From: Essential Solar Show additional information
No Bought From: Ahlec Pty Ltd Show additional information
Bought From: Essential Solar Show additional information
Still early days, but don't expect any problems with panels. The rated output per panel is very high (430w) - a definite plus.
Bought From: Solar Beam
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Bought From: Essential Solar Show additional information
Bought From: Essential Solar Show additional information
Bought From: Perth Solar Force Show additional information
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Bought From: Ahlec Pty Ltd Show additional information
I also installed 8 tigo optimisers due to the orientation on roof.
Bought From: Formula Sun
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Bought From: Ahlec Pty Ltd Show additional information
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Bought From: Formosa Electrics Pty Ltd Show additional information
All good so far!
Bought From: Formosa Electrics Pty Ltd
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Bought From: Formosa Electrics Pty Ltd Show additional information
Bought From: Green and Save Pty Ltd Show additional information
Bought From: Ahlec Pty Ltd Show additional information
Bought From: Solstra Residential Show additional information
Bought From: Space Solar Central Coast Show additional information
Bought From: Premium Solar Solutions Show additional information
Bought From: Electrics Plus WA Show additional information
Bought From: Perth Solar Force Show additional information
Bought From: Solar Beam Show additional information
Bought From: Solar Tactics Show additional information
Seem really good quality
Bought From: Pioneer Solar
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Bought From: Essential Solar Show additional information
Bought From: Green Solar Energy NSW Show additional information
Great experience so far
Bought From: Solar Seed
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Bought From: Green Wiring Show additional information
Bought From: SolarEZE NSW Show additional information
Bought From: Essential Solar Show additional information
Bought From: iGreen Energy Show additional information
Bought From: Ahlec Pty Ltd Show additional information
Bought From: Space Solar Central Coast Show additional information
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Bought From: Sungold Solar Show additional information
Bought From: Green Energy Technologies Townsville Show additional information
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Bought From: Solaworx Show additional information
16x425w
Bought From: Ahlec Pty Ltd
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Bought From: Regen Power Show additional information
Bought From: Ahlec Pty Ltd Show additional information
Bought From: Essential Solar Show additional information
Bought From: Green Solar Energy NSW Show additional information
Bought From: Island Energy Mornington Show additional information
Bought From: Solar Tactics VIC DONT USE Show additional information
Bought From: Essential Solar Show additional information
Bought From: Green Solar Energy NSW Show additional information
Bought From: Essential Solar Show additional information
Bought From: Green Wiring Show additional information
Bought From: Energy Options Show additional information
Bought From: Essential Solar Show additional information
Bought From: Green Solar Energy NSW Show additional information
Bought From: Essential Solar Show additional information
I have 22 300W Longi solar panels. They have worked perfectly and I am happy with the output from them.
Bought From: Sungold Solar
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Bought From: ShineHub Show additional information
Performing very efficiently so far.
Bought From: Green Wiring
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Love the black frames.
Bought From: Formula Sun
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Riser brackets may have been requured to fully utilise the solar cells in the cooler months.
Bought From: Lumax Solar Pty Ltd
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As those are black framed they look great on the black tiled roof.
Should be good, efficient quality product at affordable price.
Bought From: Formula Sun
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Bought From: Aussie Hybrid Solar Show additional information
Bought From: Green Solar Energy NSW Show additional information
They look ok and seem to be doing what they should. Will need to see what happens over the next few years.
Bought From: Perth Solar Warehouse
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Bought From: Rescom Solar Pty Ltd Show additional information
Bought From: Yates Electrical Services Show additional information
Bought From: Green Wiring Show additional information
Bought From: Essential Solar Show additional information
Bought From: Queensland Solar Power and Lighting Show additional information
Bought From: Lumax Solar Pty Ltd Show additional information
Bought From: Solar Beam Show additional information
Bought From: Goliath Solar and Electrical Show additional information
Bought From: Solar Beam Show additional information
I'd like to install more panels if more space is available.
Bought From: Essential Solar
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Bought From: EcoSmart Energy Group Show additional information
Bought From: Energy Makeovers Show additional information
All very good
Bought From: Reenet Solar
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Bought From: EcoSmart Energy Group Show additional information
Bought From: Reenet Solar Show additional information
Bought From: Formosa Electrics Pty Ltd Show additional information
Bought From: Adapt Energy Show additional information
Bought From: Top Value Solar Show additional information
I've yet to see them operate at 100% utilisation, but it's been pretty cloudy.
Bought From: Formosa Electrics Pty Ltd
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Looks beautiful on my roof.
Bought From: EcoSmart Energy Group
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Bought From: Perth Solar Force Show additional information
Using the microinverters to maximise the production is beneficial. Warranty what we needed. So far so good
Bought From: Essential Solar
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Bought From: Perth Solar Warehouse Show additional information
Bought From: Ahlec Pty Ltd Show additional information
Bought From: Space Solar Sydney Show additional information
Bought From: Solar Tactics Show additional information
Bought From: Energeniq Enginering Show additional information
Bought From: SolarBright Show additional information
Bought From: Essential Solar Show additional information
Bought From: Essential Solar Show additional information
Bought From: Space Solar Sydney Show additional information
Bought From: Solar Tactics VIC DONT USE Show additional information
Bought From: Solar Tactics Show additional information
Bought From: Energy Options Show additional information
Bought From: Solar Smart QLD Show additional information
Panels working nicely.
Bought From: Solar Power Nation
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Bought From: Sungen Show additional information
Bought From: Solar Smart QLD Show additional information
Bought From: EcoSmart Energy Group Show additional information
Bought From: Space Solar VIC Reviews Show additional information
Bought From: Expert Electrical Beaudesert to Warwick Show additional information
Mono
Bought From: Skylight Energy
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Bought From: Green Wiring Show additional information
Bought From: Solar Tactics VIC DONT USE Show additional information
Bought From: EcoSmart Energy Group Show additional information
Bought From: Solar Fusion Solutions Show additional information
Bought From: Skylight Energy Show additional information
Bought From: Island Energy Mornington Show additional information
Bought From: Crystal Solar Energy Pty Ltd Show additional information
Bought From: Sahara Solar Australia Show additional information
I didn’t receive what I purchased.
Bought From: Skylight Energy
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Bought From: SEM Brisbane Show additional information
Bought From: Ultimate Solar Solutions Show additional information
Bought From: Solar Central Pty Ltd Show additional information
We opted for optimisers as we have shade over our house for 30% of the day, and these solar panels are the best. We have produced solar power every day since we made the switch in May.
Bought From: Track Energy
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Seem ok so far.
Bought From: Essential Solar East
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Bought From: Sunscape Solar Bayside Show additional information
In the last eight months since our Solar PV system was installed it has generated 6.83 Mega Watt Hours of electricity. We have not had to pay an electricity bill in eight months
Bought From: Essential Solar East
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Bought From: Sunscape Solar Bayside Show additional information
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Bought From: Sky Power Energy Show additional information
Bought From: Essential Solar Northern Regional Show additional information
Bought From: Essential Solar East Show additional information
2 weeks of rain and overcast weather and they still charged the batteries to 99%
Bought From: Green Energy Technologies Townsville
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Bought From: Green Solar Show additional information
Bought From: 7Ps Energy Solutions Show additional information
Bought From: Sunrun Solar Show additional information
Bought From: Formula Sun Show additional information
Bought From: Essential Solar Northern Regional Show additional information
These are great solar panels coupled with Fronius Primo inverter. Consistent performance for a month now with varied weather. Best output of 35.4kw and worst on a rainy day of 10KW with a East/West orientation.
Bought From: Solar Merchants
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No problems at all, best we have achieved on our 10 degree angle is 85Kw, its a 12Kw system with 10Kw inverter
Bought From: JT solar
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Bought From: Essential Solar East Show additional information
Bought From: Aussie Hybrid Solar Show additional information
Bought From: Essential Solar Northern Regional Show additional information
Great Panels 300 watts per panel, high efficiency
Bought From: Formula Sun
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Bought From: Essential Solar East Show additional information
Bought From: Space Solar VIC Reviews Show additional information
As above.
Bought From: Expert Electrical Nth Brisbane to Kingaroy
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No problems at all so far.
In combination with the Fronius often produce 30kWh per day from November on.
Bought From: Essential Solar
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No problems at all so far - the panels are functioning above our expectations.
Bought From: Essential Solar
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still waiting for a power bill lol
Bought From: Green Solar
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Bought From: Raw Electrical Qld Pty Ltd Show additional information
Bought From: Helioenergy Show additional information
We had 6 Tigo optimizators installed to 6 panels that may have bee effected by shading - appears to be working fine.
Bought From: Space Solar VIC Reviews
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Bought From: Essential Solar Show additional information
Bought From: Essential Solar Show additional information
Bought From: Energus Show additional information
Bought From: Essential Solar Show additional information
Bought From: UV Power Show additional information
It is early days (not even a month in) but they are generating lots of juice (22x 300W panels, producing 28kWh on a sunny July Brisbane day).
They look the part, so far so good..
Bought From: Positronic Solar
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Longi Solar is performing much better than what I was expecting. Almost all the Tier 1 panels manufacturer give 80% efficiency after 25 years but Longi Solar give 87.7% after 25 years. I bought it purely on their reputation globally, they are also the largest Mono Crystalline panels manufacturer in the world. Their panels looks great with black frame. I am very happy with my decision.
Bought From: Essential Solar
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Longi Solar has 1 solar panel in our database

Model Type Size PTC Performance Ratio Californian Approved
LR6-72PD-365MMonocrystalline36526873.42No
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