LONGi Review 2026
LONGi manufactures 8 models across solar panels. Efficiency range 21.6%–23%.
Headquartered in China · Manufacturing in China
Founded 2000 by Li Zhenguo · Headquartered in Xi'an, Shaanxi, China
Parent company: LONGi Green Energy Technology Co., Ltd.
Listed: SH:601012
LONGi at a glance
Certifications: IEC 61215 · IEC 61730 · UL 1703 · CEC Listed
Warranty: 12-yr product · 30-yr performance
Key milestones
- 2000 Founded in Xi'an, China
- 2014 Listed on Shanghai Stock Exchange (601012)
- 2020 Became world's largest solar manufacturer by shipments
- 2023 Launched HPBC (Hybrid Passivated Back Contact) technology
Source: www.longi.com/en/about · Last updated 2026-05-27
LONGi Pros & Cons (data-driven)
+ Pros
- ✓ Average panel efficiency 22.2% exceeds industry baseline 21%
- ✓ Average product warranty 12.4yr exceeds industry baseline 12yr
- ✓ Strong heat tolerance (-0.31%/°C, better than industry -0.32%/°C)
- ✓ Low annual degradation 0.44%/yr (industry average ~0.5%/yr)
− Cons
- ✗ Distributor and installer pricing varies — direct retail rarely available
- ✗ Some 2026 models depend on regional distributor availability
Pros and cons calculated against industry baselines: 21% panel efficiency, 12yr panel warranty, -0.32%/°C temp coeff, 90% battery RTE.
Current LONGi Product List (8)
Solar Panels (8)
| Model | Wattage | Efficiency | Warranty | Verified | Score | Details |
|---|---|---|---|---|---|---|
| Hi-MO 7 620W | 620W | 23% | 12/30 yr | ✓ | 92 (A) | View → |
| Hi-MO 7 590W | 590W | 22.8% | 12/30 yr | ✓ | 91 (A) | View → |
| Hi-MO 6 580W | 580W | 22.3% | 12/25 yr | ✓ | 85 (B+) | View → |
| Hi-MO X6 Max 470W | 470W | 22.3% | 15/30 yr | ✓ | 91 (A) | View → |
| Hi-MO X6 445W | 445W | 22% | 12/25 yr | ✓ | 84 (B+) | View → |
| Hi-MO 6 Scientist 550W | 550W | 22% | 12/25 yr | — | 76 (B) | View → |
| Hi-MO 6 Artist 440W | 440W | 22% | 12/25 yr | — | 76 (B) | View → |
| Hi-MO 6 Explorer 430W | 430W | 21.6% | 12/25 yr | ✓ | 79 (B) | View → |
Spec Sheet Downloads
6 manufacturer-published datasheets available for LONGi products. All links go to the official PDF on the manufacturer's website.
- PDF LONGi Hi-MO 6 580W datasheet →https://static.longi.com/Hi_MO_6_Explorer_LR_5_72_HTH_560_585_M_V03_UT_b3ca936148.pdf
- PDF LONGi Hi-MO 7 590W datasheet →https://static.longi.com/L_Gi_LE_PM_T_PMD_059_F133_LR_5_72_HTH_590_600_M_V2_30_30_and_15_Frame_Scientist_V19_EN_pdf_26bcba7569.pdf
- PDF LONGi Hi-MO X6 445W datasheet →https://static.longi.com/L_Gi_LE_PM_T_PMD_059_F131_LR_5_54_HTH_445_455_M_V1_30_30_and_15_Black_Frame_Scientist_V19_EN_pdf_095ff43304.pdf
- PDF LONGi Hi-MO 6 Explorer 430W datasheet →https://static.longi.com/Hi_MO_6_Explorer_LR_5_54_HTH_415_430_M_V03_DG_cd1618eade.pdf
- PDF LONGi Hi-MO 7 620W datasheet →https://static.longi.com/2_LR_7_72_HGD_585_620_M_V2_30_30_and_15_V05_EN_c6514bcafc.pdf
- PDF LONGi Hi-MO X6 Max 470W datasheet →https://static.longi.com/LR_7_72_HTH_605_615_M_30_30_and_15_Frame_Explorer_20240511_V2_d0c9b7df55.pdf
Where LONGi is Recommended
Our climate-adapted state guides recommend LONGi models in 5 states.
Recent LONGi News
SolarSpec does not republish third-party news. For the latest LONGi news — product launches, financial filings, recalls, supply-chain updates — search Google News directly.
Search LONGi news on Google News →Related Brands
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Frequently Asked Questions
What is the SolarSpec Score for LONGi?
LONGi earns a SolarSpec Score of 84/100 (Grade B+) based on the weighted average of all 8 models in their 2026 lineup. The score combines efficiency, warranty, temperature coefficient, and verification status. See our /methodology/ page for the full formula.
How many solar products does LONGi offer in 2026?
LONGi offers 8 products in their 2026 lineup: 8 solar panels.
What is the most efficient LONGi solar panel?
The most efficient LONGi solar panel is the Hi-MO 7 620W at 23% efficiency with 620W output. LONGi panels range from 21.6% to 23% efficiency across 8 models.
What warranty does LONGi offer on solar panels?
LONGi offers up to 15-year product warranty and up to 30-year performance warranty. Average annual degradation across the lineup is 0.44%.
Where are LONGi solar panels manufactured?
LONGi solar panels are manufactured in China.
Where can I download LONGi datasheets?
We have direct manufacturer-published datasheet links for 6 of 8 LONGi products. See the Spec Sheet Downloads section below for direct PDF links.
How we score brands
Every LONGi model in our catalog is scored 0-100 using a transparent formula: efficiency (25 pts), product warranty (20 pts), performance warranty bonus (3 pts), temperature coefficient (12 pts), and datasheet verification (5 pts), on a 50-point baseline. The brand-level score is the simple average across all 8 models.
Read the full SolarSpec methodology →