LONGi Solar panels review 2025: 7th giant

A name from the list of Top-10 world’s solar brands, LONGi Solar has been called the fastest-growing PV manufacturer at times. What kind of panels does it offer and what are its strengths? We’ll go over every detail in our LONGi Solar panels review. 

LONGi Solar specializes in monocrystalline wafers

LONGi Solar was founded in 2000 and is headquartered in Xi'an, China. It’s one of the world's largest manufacturers of monocrystalline silicon wafers. At times, it has been labeled the fastest-growing solar company in the industry. For example, in 2016 the annual revenue from selling photovoltaics was $1.67 billion. That was a nearly 94% increase over the 2015 fiscal year, which had itself generated revenue growth of around 61% over the year before.

Longi Silicon is a member of the Silicon Module Super League (SMSL), the group of the world’s largest photovoltaics suppliers. The original six members are Canadian Solar, Hanwha Q CELLS, JA Solar, Jinko Solar, Trina Solar and Yingli Solar. LONGi was inducted into the League in 2016.

LONGi Solar panels cost less and age slower

LONGI Solar focuses on manufacturing monocrystalline PV cells and panels. The company also offers building-integrated photovoltaic solutions (BIPVs) and alkaline water electrolyzers. The power output of LONGI Solar panels ranges from 400 to 670 watts.

LONGI Solar panels show good efficiency and reach up to 25% conversion rate. The engineers make use of the latest technologies such as multibusbars, half-cut cells, PERCs and N-type cells. With HPBC cell design that shifts all contacts to the back of the panel, the modules reach a cell efficiency of almost 25%. The more efficient your panels are, the less space your system requires.

The panels from LONGi Solar come with a 12-15-year product warranty with some panels getting a 25-year warranty. The performance warranty ranges from 25 to 30 years depending on the model.

LONGi Solar engineers dope PV cells with gallium which decreases their performance drop in the first year of operation below 2% and below 1.5% with latest panels. The average degradation date of LONGi Solar panels is around -0.5-0.35% per year. The panels retain around 90% of their initial production after 25-30 years.

LONGi Solar panels: Pros 

What makes LONGi Solar panels stand out? Here is the list of their biggest advantages:

LONGi Solar panels: Cons

Let’s list some disadvantages of Chinese panels as well so no one can say that we are biased. 

LONGi Solar panels overview: For home and business

Time to look at the best panels made by LONGi Solar. Our engineer picked a few models that he likes and shared his opinion about them. 

Hi-MO 5m 425 W — Well-rounded and versatile

Hi-MO 5m is a PV module for residential and small commercial projects from LONGi Solar. It provides up to 425 W power output with 21.8% efficiency. Half-cut cell design reduces power losses caused by shading. Gallium-doped cells lose less than 2% of their output in the first year of operation. The panel retains over 84.8% output by the end of year 25. 

Hi-MO 6 600 W — Explorer, Scientist, Guardian, Artist

Hi-MO 6 came out in the beginning of 2023 and it’s still a great panel made by LONGi Solar. The model has four series: Explorer, Scientist, Guardian, Artist. They have different designs and features: for example, Guardian has a built-in optimizer and Artist comes in different colors. 

The Scientist is a panel for large commercial and industrial installations. One module provides up to 600 W with 23.3.6% efficiency. It retains 88.9% of power after 25 years in service. The panel comes with a 15-25-year product warranty and a 25-year output guarantee.

Hi-MO 10 670 W – Explorer, Scientist, Guardian

Hi-MO 10 is the most advanced panel by LONGi Solar, represented in Explorer, Scientist, and Guardian variations. The panel can reach up to 670 W output with an impressive efficiency of almost 25%, one of the best on the market. The degradation rate is also great with only 0.35% per year leaving over 88% of initial output by the end of year 30.

A1 SolarStore recommends LONGi Solar 540W LR5-72HBD-540M

In stock

23% OFF

LONGi 540W Solar Panel 144 Cell LR5-72HBD-540M Clearance

• Price per Watt$0.34
• Rated Power Output 540 W
• Voltage (VOC)49.5V
• Number of cells144
• Cell TypeMonocrystalline

Pickup on Thu, Feb 20 from Garner, NC

Delivery on Feb 25–28

$243^.40 $186^.30

Add to cart

LONGi 540 W solar panels are a good choice for building a powerful home system or a commercial solar installation. The panel provides 540 W output with 21.1% efficiency. It performs well in low-light conditions and lasts longer than your average panel. In the first year the panel loses no more than 2% and from year 2 to 30 the average degradation rate is 0.45%. 

A1 SolarStore verdict: Doing well so far

We’ve talked about the specifications and pricing of LONGi Solar panels, their pros and cons and even looked at some models that the company offers. Let’s list down the most important point about the brand:

Overall, we could say that LONGi Solar is a solid brand with affordable and high-quality panels. And it’s no surprise: you can’t reach the top of the solar industry without making your product competitive in every way. On that, we end our LONGi Solar panel review 2025 and we’ll be back with more.

Compare LONGi to other popular brands:

☀️ LG solar panels vs LONGi Solar: side-by-side comparison
☀️ REC solar panels vs LONGi Solar
☀️ Canadian Solar panels vs LONGi Solar panels
☀️ Trina solar panels vs LONGi
☀️ Panasonic solar panels vs LONGi

Andrei Gorichenskii

Senior Editor

Andrei has been a news editor and freelance writer for a number of medias before joining the A1 SolarStore. Climate change and its impact on people's lives have always been among his interests and it partially explains his degree in Philosophy and Ethics.

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