---
title: "JA Solar vs Suntech - Brand Comparison | ComparePV"
description: "Compare JA Solar vs Suntech solar panels: full portfolio, efficiency, cell technology breakdown, warranty terms and company background."
source: "https://comparepv.com/ja-solar-vs-suntech"
---

# JA Solar vs Suntech

JA Solar has the broader catalog (504 vs 255 models).


## The two companies


| Attribute | JA Solar | Suntech |
| --- | --- | --- |
| Country | China | China |
| Headquarters | Beijing | Wuxi |
| Founded | 2005 | 2001 |
| Employees | 37,289 |  |
| Annual capacity | 100+ GW/year |  |
| Tier 1 | yes | yes |
| Listed | SZSE: 002459 |  |
| Website | [https://www.jasolar.com](https://www.jasolar.com) | [https://www.suntech-power.com](https://www.suntech-power.com) |

JA Solar is a global leader in the manufacturing of high-performance photovoltaic products. Founded in 2005, the company designs, develops, manufactures, and sells solar cells and modules. JA Solar's products are used in ground-mounted power plants, commercial & industrial rooftop PV systems, and residential rooftop...


## Catalog & Power


| Measure | JA Solar | Suntech | Margin |
| --- | --- | --- | --- |
| Panel Models | 504 | 255 | +249 |
| Max Power | 740 W | 735 W | +5 W |
| Avg Power | 456 W | 505 W | +49 W |


## Efficiency


| Measure | JA Solar | Suntech | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 24.80% | 24.80% |  |
| Avg Efficiency | 21.13% | 21.76% | +0.62 pp |


## Reliability & Warranty


| Measure | JA Solar | Suntech | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.322%/°C | -0.316%/°C | +0.006 |
| Bifacial Share | 238 (47%) | 114 (45%) | +3 pp |
| Avg Warranty | 27.9 yrs | 28.4 yrs | +0.5 yr |


## Efficiency distribution

Suntech skews to higher efficiency: 19% of lineup is 23%+


| Efficiency band | JA Solar | Suntech |
| --- | --- | --- |
| \<20% | 112 (22.2%) | 11 (4.3%) |
| 20-21% | 99 (19.6%) | 61 (23.9%) |
| 21-22% | 112 (22.2%) | 64 (25.1%) |
| 22-23% | 107 (21.2%) | 70 (27.5%) |
| 23%+ | 74 (14.7%) | 49 (19.2%) |


## Power distribution

Suntech offers more 600W+ panels (20% of lineup)


| Power band | JA Solar | Suntech |
| --- | --- | --- |
| \<400W | 142 (28.2%) | 32 (12.5%) |
| 400-499W | 173 (34.3%) | 104 (40.8%) |
| 500-599W | 120 (23.8%) | 69 (27.1%) |
| 600-699W | 60 (11.9%) | 42 (16.5%) |
| 700W+ | 9 (1.8%) | 8 (3.1%) |


## Cell technology

Dominant cell tech: **PERC** (49%)

Dominant cell tech: **TOPCon** (71%)


| Technology | JA Solar | Suntech |
| --- | --- | --- |
| PERC | 247 (49.0%) | 5 (2.0%) |
| TOPCon | 146 (29.0%) | 180 (70.6%) |
| N-type | 90 (17.9%) | 5 (2.0%) |
| Unknown | 16 (3.2%) | 65 (25.5%) |
| HJT | 5 (1.0%) | 0 |


## Top panels, JA Solar


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [JAM66D46-740/LB](https://comparepv.com/panel/ja-solar-jam66d46-740-lb) | 740 | 23.8 | -0.290 | Monocrystalline |
| 2 | [JAM66D46-735/LB](https://comparepv.com/panel/ja-solar-jam66d46-735-lb) | 735 | 23.7 | -0.290 | Monocrystalline |
| 3 | [JAM66D46-730/LB](https://comparepv.com/panel/ja-solar-jam66d46-730-lb) | 730 | 23.5 | -0.290 | Monocrystalline |
| 4 | [JAM66D46-725/LB](https://comparepv.com/panel/ja-solar-jam66d46-725-lb) | 725 | 23.3 | -0.290 | Monocrystalline |
| 5 | [JAM66D46-720/LB](https://comparepv.com/panel/ja-solar-jam66d46-720-lb) | 720 | 23.2 | -0.290 | Monocrystalline |
| 6 | [JAM66D46-715/LB](https://comparepv.com/panel/ja-solar-jam66d46-715-lb) | 715 | 23.0 | -0.290 | Monocrystalline |
| 7 | [JAM66D46-710/LB](https://comparepv.com/panel/ja-solar-jam66d46-710-lb) | 710 | 22.9 | -0.290 | Monocrystalline |
| 8 | [JAM66D46-705/LB](https://comparepv.com/panel/ja-solar-jam66d46-705-lb) | 705 | 22.7 | -0.290 | Monocrystalline |
| 9 | [JAM66D46-700/LB](https://comparepv.com/panel/ja-solar-jam66d46-700-lb) | 700 | 22.5 | -0.290 | Monocrystalline |
| 10 | [JAM66D46-695/LB](https://comparepv.com/panel/ja-solar-jam66d46-695-lb) | 695 | 22.4 | -0.290 | Monocrystalline |


## Top panels, Suntech


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [STP735S-D66-Nsh+](https://comparepv.com/panel/suntech-stp735s-d66-nsh) | 735 | 23.7 | -0.280 | Monocrystalline |
| 2 | [STP730S-D66-Nsh+](https://comparepv.com/panel/suntech-stp730s-d66-nsh) | 730 | 23.5 | -0.280 | Monocrystalline |
| 3 | [STP725S-D66-Nsh+](https://comparepv.com/panel/suntech-stp725s-d66-nsh) | 725 | 23.3 | -0.280 | Monocrystalline |
| 4 | [STP720S-D66-Nsh+](https://comparepv.com/panel/suntech-stp720s-d66-nsh) | 720 | 23.2 | -0.280 | Monocrystalline |
| 5 | [STP715S-D66-Nsh+](https://comparepv.com/panel/suntech-stp715s-d66-nsh) | 715 | 23.0 | -0.280 | Monocrystalline |
| 6 | [STP710S-D66-Nsh+](https://comparepv.com/panel/suntech-stp710s-d66-nsh) | 710 | 22.9 | -0.290 | Monocrystalline |
| 7 | [STP705S-D66-Nsh+](https://comparepv.com/panel/suntech-stp705s-d66-nsh) | 705 | 22.7 | -0.290 | Monocrystalline |
| 8 | [STP700S-D66-Nsh+](https://comparepv.com/panel/suntech-stp700s-d66-nsh) | 700 | 22.5 | -0.290 | Monocrystalline |
| 9 | [STP675S-D66/Wmh](https://comparepv.com/panel/suntech-stp675s-d66-wmh) | 675 | 21.7 | -0.340 | Monocrystalline |
| 10 | [STP670S-D66/Wmh](https://comparepv.com/panel/suntech-stp670s-d66-wmh) | 670 | 21.6 | -0.340 | Monocrystalline |


## Summary

JA Solar and Suntech are both Chinese Tier 1 bankable solar panel manufacturers, yet they differ substantially in scale, market positioning, and technology strategy. JA Solar, founded in 2005 and listed on the Shenzhen Stock Exchange, has grown into one of the world's top-three module producers, with a manufacturing capacity exceeding 100 GW and a workforce of over 37,000 employees across 12 global production bases. The company shipped approximately 77 GW in 2024, exporting roughly 48% internationally, and earned PVEL Top Performer status for the tenth consecutive time in 2025. Suntech, founded slightly earlier in 2001 and also headquartered in China, operates at a considerably smaller scale with a more focused product portfolio of 136 models - compared to JA Solar's 524 - but has fully committed its lineup to n-type TOPCon cell technology, representing a clean generational shift away from older p-type architectures.

From a technology and application standpoint, JA Solar's broad portfolio - where PERC still accounts for over 52% of models - gives it versatility across residential rooftop installs, commercial C&I projects, and large utility-scale ground-mount systems. Its maximum panel output reaches 740 Wp and average module efficiency sits at approximately 20.87%, with around 44% of the range being bifacial. Suntech's 100% TOPCon lineup, by contrast, delivers a higher average efficiency of approximately 21.95% and a more favorable average temperature coefficient of -0.308%/°C versus -0.323%/°C for JA Solar, making Suntech panels better suited to warmer climates or installations where thermal performance matters. Suntech also edges ahead on average warranty length at approximately 29.1 years versus 27.9 years for JA Solar, and its average rated power of around 516 Wp reflects a portfolio weighted toward higher-wattage modules.

For international buyers choosing between the two, JA Solar is the lower-risk choice in terms of supply chain reliability, global service network, and proven bankability at scale - making it the default recommendation for large utility or C&I procurement. Suntech offers a compelling proposition for buyers specifically seeking an all-TOPCon portfolio with above-average efficiency and slightly better thermal characteristics, though buyers should verify regional distributor presence and warranty support before committing to larger volumes.

Written by claude-sonnet from the figures above.


## Other comparisons

- [JA Solar vs A.B. Energy](https://comparepv.com/ja-solar-vs-a-b-energy)
- [AE Solar vs Suntech](https://comparepv.com/ae-solar-vs-suntech)
- [JA Solar vs AEET](https://comparepv.com/ja-solar-vs-aeet)
- [AIKO vs Suntech](https://comparepv.com/aiko-vs-suntech)
- [JA Solar vs AKCOME](https://comparepv.com/ja-solar-vs-akcome)
- [ARTsolar vs Suntech](https://comparepv.com/artsolar-vs-suntech)


---

Source: https://comparepv.com/ja-solar-vs-suntech

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