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

# G-STAR vs JA Solar

JA Solar has the broader catalog (504 vs 36 models). JA Solar leads on peak efficiency at 24.80%. G-STAR leans bifacial (86% of lineup).


## The two companies


| Attribute | G-STAR | JA Solar |
| --- | --- | --- |
| Country |  | China |
| Headquarters |  | Beijing |
| Founded |  | 2005 |
| Employees |  | 37,289 |
| Annual capacity |  | 100+ GW/year |
| Tier 1 | no | yes |
| Listed |  | SZSE: 002459 |
| Website |  | [https://www.jasolar.com](https://www.jasolar.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 | G-STAR | JA Solar | Margin |
| --- | --- | --- | --- |
| Panel Models | 36 | 504 | +468 |
| Max Power | 725 W | 740 W | +15 W |
| Avg Power | 562 W | 456 W | +106 W |


## Efficiency


| Measure | G-STAR | JA Solar | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 23.51% | 24.80% | +1.29 pp |
| Avg Efficiency | 22.41% | 21.13% | +1.28 pp |


## Reliability & Warranty


| Measure | G-STAR | JA Solar | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.307%/°C | -0.322%/°C | +0.015 |
| Bifacial Share | 31 (86%) | 238 (47%) | +39 pp |
| Avg Warranty | 30.0 yrs | 27.9 yrs | +2.1 yr |


## Efficiency distribution

G-STAR skews to higher efficiency: 28% of lineup is 23%+


| Efficiency band | G-STAR | JA Solar |
| --- | --- | --- |
| 20-21% | 3 (8.3%) | 99 (19.6%) |
| 21-22% | 5 (13.9%) | 112 (22.2%) |
| 22-23% | 18 (50.0%) | 107 (21.2%) |
| 23%+ | 10 (27.8%) | 74 (14.7%) |
| \<20% | 0 | 112 (22.2%) |


## Power distribution

G-STAR offers more 600W+ panels (36% of lineup)


| Power band | G-STAR | JA Solar |
| --- | --- | --- |
| 400-499W | 11 (30.6%) | 173 (34.3%) |
| 500-599W | 12 (33.3%) | 120 (23.8%) |
| 600-699W | 7 (19.4%) | 60 (11.9%) |
| 700W+ | 6 (16.7%) | 9 (1.8%) |
| \<400W | 0 | 142 (28.2%) |


## Cell technology

Dominant cell tech: **TOPCon** (72%)

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


| Technology | G-STAR | JA Solar |
| --- | --- | --- |
| TOPCon | 26 (72.2%) | 146 (29.0%) |
| N-type | 5 (13.9%) | 90 (17.9%) |
| PERC | 5 (13.9%) | 247 (49.0%) |
| Unknown | 0 | 16 (3.2%) |
| HJT | 0 | 5 (1.0%) |


## Top panels, G-STAR


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [GSD8K66T-725WT](https://comparepv.com/panel/g-star-gsd8k66t-725wt) | 725 | 23.3 | -0.300 | Monocrystalline |
| 2 | [GSD8K66T-720WT](https://comparepv.com/panel/g-star-gsd8k66t-720wt) | 720 | 23.2 | -0.300 | Monocrystalline |
| 3 | [GSD8K66T-715WT](https://comparepv.com/panel/g-star-gsd8k66t-715wt) | 715 | 23.0 | -0.300 | Monocrystalline |
| 4 | [GSD8K66T-710WT](https://comparepv.com/panel/g-star-gsd8k66t-710wt) | 710 | 22.9 | -0.300 | Monocrystalline |
| 5 | [GSD8K66T-705WT](https://comparepv.com/panel/g-star-gsd8k66t-705wt) | 705 | 22.7 | -0.300 | Monocrystalline |
| 6 | [GSD8K66T-700WT](https://comparepv.com/panel/g-star-gsd8k66t-700wt) | 700 | 22.5 | -0.300 | Monocrystalline |
| 7 | [GSD8R66T-635WT](https://comparepv.com/panel/g-star-gsd8r66t-635wt) | 635 | 23.5 | -0.300 | Monocrystalline |
| 8 | [GSD8R66T-630WT](https://comparepv.com/panel/g-star-gsd8r66t-630wt) | 630 | 23.3 | -0.300 | Monocrystalline |
| 9 | [GSD8R66T-625WT](https://comparepv.com/panel/g-star-gsd8r66t-625wt) | 625 | 23.1 | -0.300 | Monocrystalline |
| 10 | [GSD8R66T-620WT](https://comparepv.com/panel/g-star-gsd8r66t-620wt) | 620 | 22.9 | -0.300 | Monocrystalline |


## 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 |


## Summary

G-STAR is a Singapore-based solar manufacturer established around 2019, operating with a compact and focused portfolio of 12 panels predominantly built on TOPCon cell technology (approximately 58% of the lineup), with a growing share of bifacial modules (around 58%). The company does not hold Tier 1 bankable status but has been recognized on the 2024 Global Top 500 New Energy Enterprises list. Its planned integrated production capacity in Southeast Asia is targeted at 3 GW by 2025. JA Solar, by contrast, is one of the most established names in the global solar industry, founded in 2005 and headquartered in China, listed on the Shenzhen Stock Exchange, employing over 37,000 people, and operating at a production capacity exceeding 100 GW. JA Solar holds confirmed Tier 1 bankable status from both BloombergNEF and S&P Global Commodity Insights, cementing its position as one of the most financeable module suppliers worldwide.

Despite its smaller scale, G-STAR's portfolio shows a notably higher average module efficiency of 22.27% and a more favorable average temperature coefficient of -0.30%/°C, both driven by its deliberate focus on newer TOPCon and bifacial products. With an average panel power of 517.5 Wp and a 30-year linear power warranty, G-STAR panels are well-suited for residential rooftop installations where roof area is limited and high power density is a priority. JA Solar's portfolio of 524 panels spans a much wider range - from legacy PERC modules (around 52% of the lineup) to cutting-edge TOPCon products reaching 24.4% efficiency and 740 Wp - making it an adaptable choice for residential installs, large commercial C&I projects, and utility-scale ground-mount deployments alike. The lower portfolio average efficiency of 20.87% reflects the breadth of older product generations still offered.

For international buyers selecting between the two, JA Solar is the lower-risk choice for any project requiring lender approval or long-term bankability assurances, given its scale, track record, and verified Tier 1 standing. G-STAR represents an emerging alternative for buyers prioritizing high average efficiency and modern cell technology in a leaner product range, though due diligence on local service networks and warranty backstop reliability is recommended given its younger market presence and lack of formal bankability classification.

Written by claude-sonnet from the figures above.


## Other comparisons

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


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Source: https://comparepv.com/g-star-vs-ja-solar

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