---
title: "AU Optronics vs Longi Solar - Brand Comparison | ComparePV"
description: "Compare AU Optronics vs Longi Solar solar panels: full portfolio, efficiency, cell technology breakdown, warranty terms and company background."
source: "https://comparepv.com/au-optronics-vs-longi-solar"
---

# AU Optronics vs Longi Solar

Longi Solar has the broader catalog (255 vs 1 models). Longi Solar leads on peak efficiency at 25.00%. Longi Solar leans bifacial (40% of lineup).


## The two companies


| Attribute | AU Optronics | Longi Solar |
| --- | --- | --- |
| Country | Taiwan | China |
| Headquarters | Hsinchu | Xi'an, Shaanxi |
| Founded | 1996 | 2000 |
| Employees | 41000+ | 37,853 |
| Annual capacity |  | 85-90 GW/year |
| Tier 1 | yes | yes |
| Listed | TWSE (Taiwan Stock Exchange): 2409 | Shanghai Stock Exchange: 601012 |
| Website | [https://www.auo.com/en-global](https://www.auo.com/en-global) | [https://www.longi.com](https://www.longi.com) |

AU Optronics (AUO) is a technology-driven company based in Taiwan, specializing in optoelectronics and display solutions. They deliver products and services that advance innovation in areas like display technology, system solutions, industrial intelligence, healthcare, and energy. AUO operates globally across Asia...

LONGi Green Energy Technology Co., Ltd. is a world-leading solar technology company that manufactures monocrystalline silicon wafers and modules. The company is committed to providing high-efficiency and reliable clean energy solutions for large-scale power plants, various industries, and households. LONGi aims to be...


## Catalog & Power


| Measure | AU Optronics | Longi Solar | Margin |
| --- | --- | --- | --- |
| Panel Models | 1 | 255 | +254 |
| Max Power | 170 W | 670 W | +500 W |
| Avg Power | 170 W | 544 W | +374 W |


## Efficiency


| Measure | AU Optronics | Longi Solar | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 16.00% | 25.00% | +9.00 pp |
| Avg Efficiency | 16.00% | 22.65% | +6.65 pp |


## Reliability & Warranty


| Measure | AU Optronics | Longi Solar | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.438%/°C | -0.291%/°C | +0.147 |
| Bifacial Share | 0 (0%) | 101 (40%) | +40 pp |
| Avg Warranty | - | 27.8 yrs |  |


## Efficiency distribution

Longi Solar skews to higher efficiency: 43% of lineup is 23%+


| Efficiency band | AU Optronics | Longi Solar |
| --- | --- | --- |
| \<20% | 1 (100.0%) | 3 (1.2%) |
| 20-21% | 0 | 26 (10.2%) |
| 21-22% | 0 | 47 (18.4%) |
| 22-23% | 0 | 70 (27.5%) |
| 23%+ | 0 | 109 (42.7%) |


## Power distribution

Longi Solar offers more 600W+ panels (38% of lineup)


| Power band | AU Optronics | Longi Solar |
| --- | --- | --- |
| \<400W | 1 (100.0%) | 8 (3.1%) |
| 400-499W | 0 | 81 (31.8%) |
| 500-599W | 0 | 70 (27.5%) |
| 600-699W | 0 | 96 (37.6%) |


## Cell technology

Dominant cell tech: **N-type** (42%)


| Technology | AU Optronics | Longi Solar |
| --- | --- | --- |
| Unknown | 1 (100.0%) | 55 (21.6%) |
| N-type | 0 | 107 (42.0%) |
| PERC | 0 | 51 (20.0%) |
| Back Contact | 0 | 42 (16.5%) |


## Top panels, AU Optronics


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [ASM170M](https://comparepv.com/panel/au-optronics-asm170m) | 170 | 16.0 | -0.438 | Monocrystalline |


## Top panels, Longi Solar


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 | 24.8 | -0.260 | Monocrystalline |
| 2 | [LR8-66HYD-670M](https://comparepv.com/panel/longi-lr8-66hyd-670m) | 670 | 24.8 | -0.260 | Monocrystalline |
| 3 | [LR7-72HVH-670M](https://comparepv.com/panel/longi-lr7-72hvh-670m) | 670 | 24.8 | -0.260 | Monocrystalline |
| 4 | [LR7-72HVHF-665M](https://comparepv.com/panel/longi-lr7-72hvhf-665m) | 665 | 24.6 | -0.260 | Monocrystalline |
| 5 | [LR7-72HVDF-665M](https://comparepv.com/panel/longi-lr7-72hvdf-665m) | 665 | 24.6 | -0.260 | Monocrystalline |
| 6 | [LR8-66HVD-665M](https://comparepv.com/panel/longi-lr8-66hvd-665m) | 665 | 24.6 | -0.260 | Monocrystalline |
| 7 | [LR8-66HYD-665M](https://comparepv.com/panel/longi-lr8-66hyd-665m) | 665 | 24.6 | -0.260 | Monocrystalline |
| 8 | [LR7-72HVD-665M](https://comparepv.com/panel/longi-lr7-72hvd-665m) | 665 | 24.6 | -0.260 | Monocrystalline |
| 9 | [LR7-72HVH-665M](https://comparepv.com/panel/longi-lr7-72hvh-665m) | 665 | 24.6 | -0.260 | Monocrystalline |
| 10 | [LR7-72HVHF-660M](https://comparepv.com/panel/longi-lr7-72hvhf-660m) | 660 | 24.4 | -0.260 | Monocrystalline |


## Summary

I have enough to write a solid, hedged comparison.

AU Optronics is a Taiwanese company headquartered in Hsinchu, better known globally as a flat-panel display giant (founded 2001) that formally entered the solar photovoltaic business in 2008-2009. Its PV activity, built on wafer, ingot, cell, and module production, has historically been rated Tier 1 by BloombergNEF and recognized as a Top Brand PV module maker by EuPD Research, though its solar output is a smaller, more specialized part of a much larger electronics conglomerate rather than a dedicated solar giant. Longi Solar, by contrast, is a Chinese manufacturer that has grown into one of the largest solar module producers in the world, with reported annual production scale exceeding 80 GW and repeated BloombergNEF Tier 1 rankings for PV modules, including recent quarters extending into Q1 2026, plus a newer Tier 1 listing for energy storage. On institutional footprint, Longi clearly has the stronger and more consistently reinforced global bankability profile, given its scale and the frequency with which it appears in current Tier 1 lists, whereas AU Optronics' solar credentials rest more on its earlier 2010s-era recognition and its diversified electronics business.

Product-wise, AU Optronics has historically marketed module lines such as SunPrimo and SunForte, generally polycrystalline and mono-PERC-era panels in the roughly 250-335W range aimed at residential and commercial rooftops, reflecting its more modest and legacy-oriented solar catalog compared to its display business. Longi Solar's current lineup is built around its own advanced cell technology, notably HPBC and HPBC 2.0 back-contact cells used in the Hi-MO series, spanning the Hi-MO 6 and Hi-MO S10 for premium residential rooftops, and the Hi-MO 5, Hi-MO 7, and flagship Hi-MO 9 for commercial and utility-scale ground-mount projects, with module efficiencies reported up to around 25% on the residential format.

For a typical buyer in 2025, Longi Solar is the more straightforward default choice: it has broader, more current third-party review coverage, an actively updated Tier 1 bankability record, and a wider, technologically current product range spanning residential to utility scale. AU Optronics remains a credible, Tier 1-recognized name, but its solar division is smaller in scope and less visible in recent independent reviews, making it a reasonable but less thoroughly documented alternative.

\---LINKS---

\- https://eu.longi.com/press/longi-maintains-tier-1-status-in-bloombergnef-pv-module-maker-list-for-q4-2025 \| LONGi maintains BloombergNEF Tier 1 status in Q4 2025 \| article

\- https://eu.longi.com/press/longi-achieves-tier-1-ranking-for-pv-modules-and-energy-storage-in-bloombergnef-q1-2026-report \| LONGi achieves double Tier 1 ranking in BloombergNEF Q1 2026 report \| article

\- https://www.solarreviews.com/blog/longi-solar-panels \| Expert Review of LONGi Solar Panels \| review

\- https://www.cleanenergyreviews.info/blog/longi-solar-panels-review \| Longi Solar Panels Review - Clean Energy Reviews \| review

\- https://www.enfsolar.com/directory/panel/6424/au-optronics \| AU Optronics Corporation solar panel profile \| article

Written by claude-sonnet-5 from the figures above.


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- [AU Optronics vs A.B. Energy](https://comparepv.com/au-optronics-vs-a-b-energy)
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- [AIKO vs Longi Solar](https://comparepv.com/aiko-vs-longi-solar)
- [AU Optronics vs AKCOME](https://comparepv.com/au-optronics-vs-akcome)
- [ARTsolar vs Longi Solar](https://comparepv.com/artsolar-vs-longi-solar)


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Source: https://comparepv.com/au-optronics-vs-longi-solar

Not in this file, on the page: the distributions above drawn as charts.