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

# GCL vs Suntech

Suntech has the broader catalog (255 vs 232 models). Suntech leads on peak efficiency at 24.80%. GCL leans bifacial (65% of lineup).


## The two companies


| Attribute | GCL | Suntech |
| --- | --- | --- |
| Country | China | China |
| Headquarters | Suzhou/Hong Kong | Wuxi |
| Founded | 1990 | 2001 |
| Employees | 6000+ |  |
| Annual capacity | 30+ GW/year |  |
| Tier 1 | yes | yes |
| Listed | Hong Kong Stock Exchange/Shenzhen Stock Exchange: 03800.HK/002506.SZ |  |
| Website | [http://www.gcltech.com/](http://www.gcltech.com/) | [https://www.suntech-power.com](https://www.suntech-power.com) |

GCL is a global company focusing on green energy and high-efficiency photovoltaic materials. They are known for their innovation in polysilicon and wafer technologies, with a focus on low-carbon solutions. GCL is committed to building a low-carbon PV value chain and advancing global clean energy transformation.


## Catalog & Power


| Measure | GCL | Suntech | Margin |
| --- | --- | --- | --- |
| Panel Models | 232 | 255 | +23 |
| Max Power | 740 W | 735 W | +5 W |
| Avg Power | 558 W | 505 W | +53 W |


## Efficiency


| Measure | GCL | Suntech | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 24.50% | 24.80% | +0.30 pp |
| Avg Efficiency | 22.03% | 21.76% | +0.27 pp |


## Reliability & Warranty


| Measure | GCL | Suntech | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.320%/°C | -0.316%/°C | +0.004 |
| Bifacial Share | 151 (65%) | 114 (45%) | +20 pp |
| Avg Warranty | 28.4 yrs | 28.4 yrs | +0.0 yr |


## Efficiency distribution

GCL skews to higher efficiency: 28% of lineup is 23%+


| Efficiency band | GCL | Suntech |
| --- | --- | --- |
| \<20% | 2 (0.9%) | 11 (4.3%) |
| 20-21% | 43 (18.5%) | 61 (23.9%) |
| 21-22% | 73 (31.5%) | 64 (25.1%) |
| 22-23% | 48 (20.7%) | 70 (27.5%) |
| 23%+ | 66 (28.4%) | 49 (19.2%) |


## Power distribution

GCL offers more 600W+ panels (44% of lineup)


| Power band | GCL | Suntech |
| --- | --- | --- |
| \<400W | 6 (2.6%) | 32 (12.5%) |
| 400-499W | 60 (25.9%) | 104 (40.8%) |
| 500-599W | 63 (27.2%) | 69 (27.1%) |
| 600-699W | 81 (34.9%) | 42 (16.5%) |
| 700W+ | 22 (9.5%) | 8 (3.1%) |


## Cell technology

Dominant cell tech: **TOPCon** (47%)

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


| Technology | GCL | Suntech |
| --- | --- | --- |
| TOPCon | 108 (46.6%) | 180 (70.6%) |
| PERC | 102 (44.0%) | 5 (2.0%) |
| N-type | 10 (4.3%) | 5 (2.0%) |
| HJT | 7 (3.0%) | 0 |
| BIPV | 5 (2.2%) | 0 |
| Unknown | 0 | 65 (25.5%) |


## Top panels, GCL


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [GCL-NT12/66GDF-740](https://comparepv.com/panel/gcl-gcl-nt12-66gdf-740) | 740 | 23.8 | -0.290 | Monocrystalline |
| 2 | [GCL-NT12/66GDF-735](https://comparepv.com/panel/gcl-gcl-nt12-66gdf-735) | 735 | 23.7 | -0.290 | Monocrystalline |
| 3 | [GCL-NT12/66GDF-730](https://comparepv.com/panel/gcl-gcl-nt12-66gdf-730) | 730 | 23.5 | -0.290 | Monocrystalline |
| 4 | [NT12/66GDF-730](https://comparepv.com/panel/gcl-nt12-66gdf-730) | 730 | 23.5 | -0.290 | Monocrystalline |
| 5 | [GCL-NT12/66GDF-725](https://comparepv.com/panel/gcl-gcl-nt12-66gdf-725) | 725 | 23.3 | -0.290 | Monocrystalline |
| 6 | [NT12/66GDF-725](https://comparepv.com/panel/gcl-nt12-66gdf-725) | 725 | 23.3 | -0.290 | Monocrystalline |
| 7 | [GCL-NT12/66GDF 725](https://comparepv.com/panel/gcl-gcl-nt12-66gdf-725-1) | 725 | 23.3 | -0.290 | Monocrystalline |
| 8 | [GCL-NH12/66GDF-720](https://comparepv.com/panel/gcl-gcl-nh12-66gdf-720) | 720 | 23.2 | -0.240 | Monocrystalline |
| 9 | [GCL-NT12/66GDF-720](https://comparepv.com/panel/gcl-gcl-nt12-66gdf-720) | 720 | 23.2 | -0.290 | Monocrystalline |
| 10 | [NT12/66GDF-720](https://comparepv.com/panel/gcl-nt12-66gdf-720) | 720 | 23.2 | -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

GCL (Golden Concord Group) is a Chinese conglomerate headquartered in Suzhou whose photovoltaic arm - GCL System Integration Technology - has grown into one of the world's largest solar module producers. The company holds Tier 1 status on BloombergNEF bankability lists and reported module manufacturing capacity of approximately 30 GW per year as of 2024, placing it firmly among a handful of dominant global suppliers. It also holds over 600 active patents and has continued heavy investment in next-generation cell architectures. Suntech Power was founded in 2001 by Dr. Zhengrong Shi in Wuxi, Jiangsu, and was for a time the world's largest solar panel producer by shipment volume, reaching 1.49 GW of deliveries in 2010. After defaulting on a USD 541 million bond in 2013 and undergoing acquisition by Shunfeng Photovoltaic Group, the company restructured and returned to market. As of early 2026, Hongyuan Green Energy is pursuing another court-led ownership change. Despite this turbulence, Suntech retains Tier 1 BNEF bankability recognition and cumulative shipments exceeding 55 GW. Its current module capacity stands at roughly 5.5 GW - considerably smaller than GCL. In terms of institutional market presence and financial stability, GCL carries the stronger footprint.

GCL addresses the full range of installation segments: residential rooftop, commercial and industrial (C&I), and large utility-scale ground-mount projects. Its product development is centered on n-type TOPCon technology, with modules reaching 23.5% efficiency in late 2025, and the company launched a 660 W back-contact (BC) module in early 2025, signaling a push into premium cell technology. Suntech's current lineup revolves around the Ultra V Pro and Ultra X Pro series, both built on n-type TOPCon cells, covering residential and commercial use cases. The brand's long field history gives installers a meaningful body of real-world performance data to draw on.

For most international buyers - whether procuring panels for a residential installation or a mid-scale utility project - GCL is the lower-risk default, given its production scale, ongoing R&D investment, and more stable ownership structure. Suntech remains a credible Tier 1 option with a recognized brand and competitive TOPCon products, but the recurring ownership transitions warrant scrutiny of long-term warranty and service continuity before committing to large volumes. For short-horizon projects the two brands are broadly interchangeable; for multi-decade infrastructure commitments, GCL's institutional depth gives it a meaningful edge.

Written by claude-sonnet from the figures above.


## Other comparisons

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


---

Source: https://comparepv.com/gcl-vs-suntech

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