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

# JA Solar vs KB Solar

JA Solar has the broader catalog (504 vs 5 models). JA Solar leads on peak efficiency at 24.80%. KB Solar leans bifacial (100% of lineup).


## The two companies


| Attribute | JA Solar | KB Solar |
| --- | --- | --- |
| Country | China |  |
| Headquarters | Beijing |  |
| Founded | 2005 |  |
| Employees | 37,289 |  |
| Annual capacity | 100+ GW/year |  |
| Tier 1 | yes | no |
| 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 | JA Solar | KB Solar | Margin |
| --- | --- | --- | --- |
| Panel Models | 504 | 5 | +499 |
| Max Power | 740 W | 385 W | +355 W |
| Avg Power | 456 W | 375 W | +81 W |


## Efficiency


| Measure | JA Solar | KB Solar | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 24.80% | 20.90% | +3.90 pp |
| Avg Efficiency | 21.13% | 20.38% | +0.75 pp |


## Reliability & Warranty


| Measure | JA Solar | KB Solar | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.322%/°C | -0.330%/°C | +0.008 |
| Bifacial Share | 238 (47%) | 5 (100%) | +53 pp |
| Avg Warranty | 27.9 yrs | 30.0 yrs | +2.1 yr |


## Efficiency distribution

JA Solar skews to higher efficiency: 15% of lineup is 23%+


| Efficiency band | JA Solar | KB Solar |
| --- | --- | --- |
| \<20% | 112 (22.2%) | 0 |
| 20-21% | 99 (19.6%) | 5 (100.0%) |
| 21-22% | 112 (22.2%) | 0 |
| 22-23% | 107 (21.2%) | 0 |
| 23%+ | 74 (14.7%) | 0 |


## Power distribution

JA Solar offers more 600W+ panels (14% of lineup)


| Power band | JA Solar | KB Solar |
| --- | --- | --- |
| \<400W | 142 (28.2%) | 5 (100.0%) |
| 400-499W | 173 (34.3%) | 0 |
| 500-599W | 120 (23.8%) | 0 |
| 600-699W | 60 (11.9%) | 0 |
| 700W+ | 9 (1.8%) | 0 |


## Cell technology

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

Dominant cell tech: **PERC** (100%)


| Technology | JA Solar | KB Solar |
| --- | --- | --- |
| PERC | 247 (49.0%) | 5 (100.0%) |
| TOPCon | 146 (29.0%) | 0 |
| N-type | 90 (17.9%) | 0 |
| Unknown | 16 (3.2%) | 0 |
| 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, KB Solar


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [KBS-385](https://comparepv.com/panel/kb-solar-kbs-385) | 385 | 20.9 | -0.330 | Monocrystalline |
| 2 | [KBS-380](https://comparepv.com/panel/kb-solar-kbs-380) | 380 | 20.6 | -0.330 | Monocrystalline |
| 3 | [KBS-375](https://comparepv.com/panel/kb-solar-kbs-375) | 375 | 20.3 | -0.330 | Monocrystalline |
| 4 | [KBS-370](https://comparepv.com/panel/kb-solar-kbs-370) | 370 | 20.1 | -0.330 | Monocrystalline |
| 5 | [KBS-365](https://comparepv.com/panel/kb-solar-kbs-365) | 365 | 20.0 | -0.330 | Monocrystalline |


## Summary

JA Solar is one of the world's largest solar panel manufacturers, founded in 2005 and headquartered in China, with a workforce exceeding 37,000 employees and an annual production capacity of over 100 GW. The company holds Tier 1 bankable status and the highest AAA rating in PV ModuleTech's Bankability Rankings, and in the first half of 2025 it tied for the top position in Wood Mackenzie's Global Solar Module Manufacturer Ranking alongside Trina Solar. JA Solar is listed on the Shenzhen Stock Exchange and maintains a broad international commercial and distribution footprint across Europe, Asia-Pacific, and the Americas. KB Solar, by contrast, is a small-scale manufacturer or assembler with no Tier 1 bankability rating, a portfolio of just 5 panel models, and limited publicly available information on financial stability or global distribution reach. Its panels are assembled in the USA, targeting niche domestic segments rather than international utility or commercial markets.

JA Solar's portfolio of 524 panel models spans a wide performance range, from PERC-based modules - which account for 52.1% of its lineup - up to advanced TOPCon bifacial panels reaching a maximum efficiency of 24.4% and a peak power of 740 Wp. This breadth makes JA Solar suitable for residential rooftop installs, large-scale ground-mount utility projects, and commercial C&I applications alike. The average temperature coefficient of -0.32%/°C is competitive, and the 44.3% share of bifacial modules in the portfolio reflects the company's push toward higher-yield solutions. KB Solar's offer is narrower, with all 5 models being bifacial PERC modules, an average efficiency of 20.38%, and a maximum output of 385 Wp - positioning them mainly for small off-grid or residential setups where 100% bifacial PERC and a 30-year performance warranty are prioritized over panel power density.

For international buyers - project developers, EPCs, or installers - the comparison is straightforward. JA Solar's Tier 1 bankability, AAA financial rating, 100+ GW manufacturing scale, and broad product range make it a lower-risk choice for virtually any project size or type. KB Solar may appeal in niche scenarios where a domestically assembled, fully bifacial PERC module with a 30-year warranty is specifically required, but the absence of Tier 1 status and the very limited product portfolio introduce meaningful procurement and financing risk for commercial or utility-scale projects.

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)
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- [AIKO vs KB Solar](https://comparepv.com/aiko-vs-kb-solar)
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- [ARTsolar vs KB Solar](https://comparepv.com/artsolar-vs-kb-solar)


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

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