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

# JA Solar vs JS Solar

JA Solar has the broader catalog (504 vs 137 models). JA Solar leads on peak efficiency at 24.80%. JA Solar leans bifacial (47% of lineup).


## The two companies


| Attribute | JA Solar | JS Solar |
| --- | --- | --- |
| Country | China | China |
| Headquarters | Beijing | Jinhua |
| Founded | 2005 | 2011 |
| Employees | 37,289 |  |
| Annual capacity | 100+ GW/year |  |
| Tier 1 | yes | no |
| Listed | SZSE: 002459 |  |
| Website | [https://www.jasolar.com](https://www.jasolar.com) | [https://www.jssolar.com](https://www.jssolar.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 | JS Solar | Margin |
| --- | --- | --- | --- |
| Panel Models | 504 | 137 | +367 |
| Max Power | 740 W | 670 W | +70 W |
| Avg Power | 456 W | 430 W | +26 W |


## Efficiency


| Measure | JA Solar | JS Solar | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 24.80% | 22.45% | +2.35 pp |
| Avg Efficiency | 21.13% | 20.03% | +1.10 pp |


## Reliability & Warranty


| Measure | JA Solar | JS Solar | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.322%/°C | -0.335%/°C | +0.013 |
| Bifacial Share | 238 (47%) | 12 (9%) | +38 pp |
| Avg Warranty | 27.9 yrs | 25.1 yrs | +2.7 yr |


## Efficiency distribution

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


| Efficiency band | JA Solar | JS Solar |
| --- | --- | --- |
| \<20% | 112 (22.2%) | 44 (32.1%) |
| 20-21% | 99 (19.6%) | 49 (35.8%) |
| 21-22% | 112 (22.2%) | 38 (27.7%) |
| 22-23% | 107 (21.2%) | 6 (4.4%) |
| 23%+ | 74 (14.7%) | 0 |


## Power distribution

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


| Power band | JA Solar | JS Solar |
| --- | --- | --- |
| \<400W | 142 (28.2%) | 54 (39.4%) |
| 400-499W | 173 (34.3%) | 44 (32.1%) |
| 500-599W | 120 (23.8%) | 32 (23.4%) |
| 600-699W | 60 (11.9%) | 7 (5.1%) |
| 700W+ | 9 (1.8%) | 0 |


## Cell technology

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

Dominant cell tech: **PERC** (39%)


| Technology | JA Solar | JS Solar |
| --- | --- | --- |
| PERC | 247 (49.0%) | 53 (38.7%) |
| TOPCon | 146 (29.0%) | 8 (5.8%) |
| N-type | 90 (17.9%) | 0 |
| Unknown | 16 (3.2%) | 76 (55.5%) |
| 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, JS Solar


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [JS210MHC132-670](https://comparepv.com/panel/js-solar-js210mhc132-670) | 670 | 21.6 | -0.340 | Monocrystalline |
| 2 | [JS210MHC132-665](https://comparepv.com/panel/js-solar-js210mhc132-665) | 665 | 21.4 | -0.340 | Monocrystalline |
| 3 | [JS210MHC132-660](https://comparepv.com/panel/js-solar-js210mhc132-660) | 660 | 21.2 | -0.340 | Monocrystalline |
| 4 | [JS210MHC132-655](https://comparepv.com/panel/js-solar-js210mhc132-655) | 655 | 21.1 | -0.340 | Monocrystalline |
| 5 | [JS210MHC132-650](https://comparepv.com/panel/js-solar-js210mhc132-650) | 650 | 20.9 | -0.340 | Monocrystalline |
| 6 | [JS210MHC120-605](https://comparepv.com/panel/js-solar-js210mhc120-605) | 605 | 21.4 | -0.340 | Monocrystalline |
| 7 | [JS210MHC120-600](https://comparepv.com/panel/js-solar-js210mhc120-600) | 600 | 21.2 | -0.340 | Monocrystalline |
| 8 | [JS210MHC120-595](https://comparepv.com/panel/js-solar-js210mhc120-595) | 595 | 21.0 | -0.340 | Monocrystalline |
| 9 | [JS210MHC120-590](https://comparepv.com/panel/js-solar-js210mhc120-590) | 590 | 20.8 | -0.340 | Monocrystalline |
| 10 | [JS210MHC120-585](https://comparepv.com/panel/js-solar-js210mhc120-585) | 585 | 20.7 | -0.340 | Monocrystalline |


## Summary

JA Solar and JS Solar are both Chinese photovoltaic module manufacturers, but they occupy very different positions in the global market. JA Solar was founded in 2005, is listed on the Shenzhen Stock Exchange, employs over 37,000 people, and has surpassed 100 GW of total production capacity - placing it among the top two or three module manufacturers in the world. In the first half of 2025, Wood Mackenzie ranked JA Solar co-first globally alongside Trinasolar, and S&P Global Commodity Insights confirmed its Tier 1 bankable status, making it a preferred choice for project finance. PVEL awarded JA Solar Top Performer status for the tenth consecutive time in its 2025 Scorecard. JS Solar, founded in 2011 and based in Wuxi, Jiangsu, is a significantly smaller operation with no Tier 1 designation and a portfolio of 137 panels compared to JA Solar's 524.

On the technology side, JA Solar's portfolio is led by PERC cells (over 52% of panels), with a growing TOPCon presence reflected in its maximum panel power of 740 Wp and a maximum efficiency of 24.4%. Its average efficiency of 20.87%, bifacial share of 44.3%, and average warranty of 27.85 years represent a strong overall value proposition. JS Solar peaks at 670 Wp and 22.45% efficiency, with an average efficiency of 20.03% and an average warranty of 25.15 years - workable figures, but below JA Solar across the board. Notably, over 55% of JS Solar's portfolio carries an unspecified cell technology classification, which limits transparency for buyers evaluating long-term performance. For utility-scale ground-mount projects, JA Solar's bifacial range and bankability make it the clear choice; for residential rooftop installs, its warranty depth and PVEL track record provide strong installer confidence.

For international buyers choosing between the two, JA Solar is the lower-risk option at virtually every project scale - from residential rooftop systems to large commercial C&I and utility projects requiring bank financing. JS Solar may serve budget-conscious buyers in cash-purchase residential or small commercial projects where Tier 1 status is not a requirement, but the limited portfolio transparency and absence of independent third-party performance recognition warrant careful due diligence before specifying it in any project where long-term yield guarantees matter.

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 JS Solar](https://comparepv.com/ae-solar-vs-js-solar)
- [JA Solar vs AEET](https://comparepv.com/ja-solar-vs-aeet)
- [AIKO vs JS Solar](https://comparepv.com/aiko-vs-js-solar)
- [JA Solar vs AKCOME](https://comparepv.com/ja-solar-vs-akcome)
- [ARTsolar vs JS Solar](https://comparepv.com/artsolar-vs-js-solar)


---

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

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