LONGi Solar Panels: An Independent Review by Solar Choice

Note: Solar Choice is not a solar installer and has no financial or other incentives to promote any product brand over another.

LONGi Solar – Company History

LONGi Solar was founded in February 2000 as Xi’an LONGi Silicon Materials Corporation. The company’s initial focus was on the development and production of single crystal (monocrystalline) silicon wafers that are used in many of the major solar panels brands.

The company now has a total of 10 manufacturing plants producing silicon cells and full solar panels. Eight of them are located in China, and the other two are located in Vietnam and Malaysia. They have also commenced construction on a new facility in India.

LONGi was the only Solar Panel manufacturer to be named AAA-rated by the PV ModuleTech Bankability Ratings in the Q3 2020 rankings. 

As the largest product of solar panels in the world, LONGi was ranked 724th in Forbes’ global top 2000 in 2022.

In Australian, LONGi Solar Panels first came on the scene in 2017 and have since captured a significant portion of the market share. They have established a local Australian office in Sydney to support local customers and installers.

In September 2022, LONGi announced that they had broken the new world record of conversion efficiency of 26.12% for its p-type silicon heterojunction (HJT) cells.

Key Indicators

 LONGi Solar Panels
Bloomberg Tier 1 RankingTier 1
PV Evolution Labs Top Performer (2024)Yes (6 out of 7 tests)
Office location in AustraliaYes

What is a Bloomberg Tier 1 Solar Panel?

Bloomberg’s infamous tier 1 ranking is NOT a measure of Solar Panel quality in any way. It is simply an indication of the bankability of the manufacturer based on publicly released information on the financial health the company. This should give you an idea if the company is a large, well-known manufacturer.

See full list of Bloomberg Tier 1 Solar Panels

 

What is PV Evolution Labs Top Performer?

PV Evolution Labs with support from DNV GL independently test solar panel reliability. The tests are voluntary, with solar panel manufacturers paying to participate in the testing. This testing process is internationally renowned and is an accurate reflection of the solar panel’s performance.

LONGi Solar Panels was listed as a top performer for 6 performance tests(damp heat, mechanical stress sequence, hail stress sequence, PID, LID+LETID, PAN performance) in the latest report. Please note that Longi Solar had a large number of different solar panel models tested with varying results.

See full list of PV Evolution Labs Top Performing Solar Panels

Why is office location in Australia Important?

Most solar panel manufacturers entering the Australian market first set up their distribution channels and worry about customer service later. This has led to many unhappy customers who are left trying to contact Chinese head offices to claim on their 10-year product warranty.

Relying on your solar installer is not always an option as we’ve seen many residential solar installers (including the large ones) go out of business well within the lifetime of the systems they are installing. 

LONGi’s Australian office is located in Sydney.

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How much do LONGi Solar Panels cost?

Based on Solar Choice’s database we have access to average costs as an indicative guide. The below prices include:

  • Full turnkey Solar System with LONGi Solar Panels
  • Installation from a pre-vetted reputable installer from Solar Choice’s network
  • The STC rebate and GST
System SizeAverage Fully Installed Cost
10kW$9,170
8KW$8,604
6kW$5,493

 Important Note: Prices will vary depending on location, inverter brand and which installer is used

LONGi Solar Panels – Points of Difference

There are many solar panels out there, what makes LONGi solar panels stand out?

The largest solar panel manufacturer in the world

LONGi’s technological and manufacturing not just focus on solar modules but also on the selling solar wafers and cells to other solar manufacturers. According to data from Bloomberg, LONGi Solar has been at the largest solar panel manufacturer since 2020. 

Their annual production capacity is reported to be 105GW for silicon wafers and 60GW for solar panels Q2 2022. 

Vertically Integrated Solar PV Value Chain

LONGi owns most steps in the vertical supply chain to produce a solar panel including producing ingots, silicon wafers and solar cells. This strategy enables them to keep greater control over the supply and quality of each step of the process.

Many other solar panel brands acquire silicon wafers or solar cells from LONGi and pick up the process from there

LONGi only produces monocrystalline PERC solar panels as they have been focused on producing single crystal (mono) silicon wafers since the early 2000s. Generally their panels have higher efficiency due to leading cell technology than their competition at a similar price range.

LONGi Solar Panel Technologies

LONGi Solar currently has 149 solar panels approved by the Clean Energy Council in Australia under the name “LONGi Green Energy Technology Co Ltd”. This is a requirement to be eligible for the federal STC solar rebate.

LONGi has two main series of solar panels: Hi-MO 4, and Hi-MO 5, which have a variety of different options to suit residential, commercial and utility-scale projects.

Hi-MO 4 SeriesLongi - Hi MO4

The Hi-MO 4 series uses gallium-doped silicon cells which improves the solar panels resistance to LID. In simple terms the amount of power the panel will produce will remain higher over time than most other panels with an annual degradation rate of 0.55% per year (typically 0.7%). These solar panels also offer a 12-year product warranty which is in line with most of the options on the market.

Hi-MO 5 SeriesLongi - Hi MO5

LONGi have also increased the working current within the panels to ~13amps (from 11amps in the Hi-MO 4m series) which is better suited to the mainstream string inverters that are available.

This range includes the traditional colours and an ‘all-black’ option like the Hi-MO4 series

The series also offers an ‘all black’ option where the solar cells and aluminium frame are black to offer customers a more aesthetically pleasing solution for their roof. 

Hi-MO 6 Series

The Hi-MO 6 series comes in 4 different variants which have been named by LONGi as the Artist, Guardian, Explorer and the Scientist.

The Artist features coloured panels for a specific aesthetic appeal. The Guardian has a built in power optimiser on each panel which makes installation simple for projects seeking this technology.

The Explorer and Scientist models are Longi’s more cost-effective solar panels and the ones you are mostly likely to see quoted in Australia, with the Scientist being the slightly superior model. These solar panels feature a maximum efficiency of up to 23.0% which is a market leading figure.

They are also guaranteed to degrade slower than many of their competitors with the annual degradation rate after year 1 guaranteed to be no more than 0.4% p.a.

As per previous series, the Hi-MO 6 solar panels come in an all black version to suit customers preference for the appearance of the solar array.

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LONGi’s Warranty Offer for Australian Customers

Solar panels in the Australian market come with a performance warranty and a product warranty.

The product warranty is probably the more important one as it covers manufacturing defects and most problems experienced with solar panels. LONGi typically offers 15 years for their product warranty, however some of the Hi-MO 6 panels have a 25 year product warranty – it is important to check the datasheet of what you’ve been quoted.
A product warranty of 25-years is quickly becoming the norm in the Australian market.

Looking through LONGi’s warranty documentation, there is a clearly documented process to claim a warranty and adequate remedies available after an assessment has been made. Given LONGi have an Australian office to assist with this process, this is one of the better options available in the market.

The performance warranty for solar panels guarantees a maximum rate at which the solar panel will degrade over time. LONGi’s latest Hi-MO 6 (Scientist) series guarantees that their solar panels will degrade no more than 1% in the first year and then no more than 0.4% for the following 24 years. This gives them a slight edge of many of their competitors who typically offer (2.5% in year 1 and 0.7% thereafter).

Over time we would expect LONGi solar panels to slightly outperform other cost-effective brands, however making a claim against the performance warranty for a residential customer is difficult without high quality monitoring equipment.

Click here to read LONGi’s full Australian warranty document.

Pros and Cons of LONGi Solar Panels

ProsCons
  • Large manufacturing capacity and healthy financial position
  • Completely vertically integrated manufacturing process
  • Have local office in Sydney, Australia
  • A comparatively later entrant to the Australian solar panel market
  • Shorter product warranty – panels are mostly focused on the mid-range cost-effective mass market

LONGi Solar Panel Specifications (common modules)

 LONGi 440W Hi-MO 6 Explorer
LR5-54HTH-440M
LONGi 450W Hi-MO 6 Scientist
LR5-54HTH-450M
Cell Number108 Cells108 Cells (Half Cut)
Cell TypeMonocrystalline PERCMonocrystalline PERC
Power Output440Wp450Wp
Power Density225 W/m²230 W/m²
Panel Efficiency22.5%23.0%
Annual Power Degradation0.4%0.4%
Dimensions1,722 mm x 1134 mm x 30 mm1,722 mm x 1,134 mm x 30 mm
Weight20.8 kg20.8 kg
Product Warranty15 Years25 Years
Temperature Coefficient Pmax-0.290%/’C-0.290%/’C
Made inChinaChina

So, are LONGi Solar Panels a good option for me?

 LONGi Solar Panels are a great reliable option for a customer looking for an affordable mid-range panel from a company with a solid financial backing and reputation. Given their size, if your solar installer goes out of business, you have a very good chance of claiming warranty directly from the LONGi as they are established in Australia and are the biggest manufacturer in the world.

Example of a LONGi Commercial Solar Project – Numurkah Solar Farm (Victoria, Aus)

  • Date: Q3, 2019
  • Type of Application: Utility-scale solar farm
  • System Size: 128 MWp

LONGi were selected by as the solar panel manufacturer by French renewable energy producer Neoen. The project features 373,839 ground-mounted solar panels spanning 515 hectares. The farm has long-term supply agreements with the Victorian Government and will power Melbourne’s tram network and Laverton Steelworks.

LONGi Solar Panel example project victorian government contract

Read more product reviews from Solar Choice

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Since 2008 our knowledge and sophisticated software has allowed over 300,000 Australian households and businesses to make a well-informed choice on their solar & battery installer.
Jeff Sykes

Reviews from Australians who have installed Longi Panels

Rated 4.87 from 52 reviews
24th June 2024
Tracey
-
7kW system
5.00

5th June 2024
Ray
-
10-15kW system
5.00

31st May 2024
Justin
-
10kW system
5.00

Excellent output and looks smart

28th May 2024
Vesna
-
6kW system
5.00

7th May 2024
Kiran
-
30-50kW system
5.00

Super performing brand

6th May 2024
Ritu
-
10-15kW system
5.00

We have done the research and happy with Longi

2nd May 2024
Tracy
-
6kW system
5.00

24th April 2024
Jasna
-
6kW system
5.00

20th April 2024
QLD - 4552
6kW system
5.00

too early to tell

27th March 2024
VIC - 3032
7kW system
5.00

19th March 2024
NSW - 2756
15-20kW system
5.00

System output has been great. As well as reliable. No issues at all.

18th March 2024
Brad
-
6kW system
5.00

24th January 2024
TAS - 7109
10-15kW system
5.00

Great panels. All black. Excellent performance.

1st December 2023
Pradyumn
WA - 6060
7kW system
5.00

14th November 2023
Graeme
VIC - 3030
6kW system
5.00

Longi 370W Hi-MO4 model (Mono-PERC, Split-Cell - Black Frame. Everything is working flawlessly so far.

3rd November 2023
Justin
WA - 6155
5kW system
5.00

They seem to be performing well thus far.

22nd October 2023
Jacqui
WA - 6065
6kW system
4.00

26th September 2023
Stuart
VIC - 3810
5kW system
5.00

Have been reliable, no complaints.

23rd September 2023
George
-
10kW system
5.00

Longi is really good

29th August 2023
Nadine
NSW - 2750
15-20kW system
5.00

18th August 2023
Riley
-
10-15kW system
5.00

17th August 2023
James
QLD - 4035
10kW system
5.00

14th July 2023
Michael
VIC - 3165
5kW system
5.00

12th July 2023
Brian
-
10-15kW system
5.00

Look good and seem to be performing great!

23rd June 2023
Ian
QLD - 4521
10-15kW system
5.00

Works well.

11th May 2023
Steve
-
6kW system
5.00

29th March 2023
Robert
-
6kW system
5.00

24th March 2023
Phil
-
6kW system
5.00

21st February 2023
Yiannis
TAS - 7054
6kW system
4.00

Panels working well so far.

27th January 2023
Ron
-
6kW system
5.00

21st December 2022
Sam
-
6kW system
5.00

Performing better than expected.

18th December 2022
Lisa
-
6kW system
5.00

Looks great installed

2nd December 2022
Jay
-
6kW system
5.00

7th November 2022
Michael
-
6kW system
5.00

3rd November 2022
Kathryn
-
6kW system
5.00

27th October 2022
Jenn
-
6kW system
5.00

24th October 2022
Andrew
-
5kW system
5.00

16th October 2022
Brooke
-
6kW system
5.00

24th September 2022
Stephanie
-
6kW system
5.00

2nd September 2022
Ken
QLD - 4020
10kW system
5.00

21st July 2022
Jennifer
-
6kW system
4.00

We actually ended up with Leapton 440w solar panels

5th July 2022
Florin
-
5kW system
5.00

26th May 2022
Rims
-
6kW system
5.00

Best budgeted

12th May 2022
Dillon
-
5kW system
4.00

6th May 2022
Paul
-
8kW system
5.00

N/A

6th May 2022
Daniel
-
6kW system
5.00

8th July 2021
Simon
-
20-30kW system
4.00

The solar panels have performed satisfactorily, meeting our expectations.

8th July 2021
Peter
-
6kW system
4.00

Good price and warranty

7th June 2021
Ryan
VIC - 3214
6kW system
4.00

Difficult to assess savings at this point due to slow install of interconnect by powerCore

25th May 2021
-
6kW system
5.00

.

25th May 2021
-
6kW system
5.00

.

10th May 2021
-
6kW system
5.00

Happy so far