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

# JA Solar vs Solarwatt

JA Solar has the broader catalog (504 vs 44 models). JA Solar leads on peak efficiency at 24.80%.


## The two companies


| Attribute | JA Solar | Solarwatt |
| --- | --- | --- |
| Country | China | Germany |
| Headquarters | Beijing | Dresden |
| Founded | 2005 | 1993 |
| 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.solarwatt.com](https://www.solarwatt.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 | Solarwatt | Margin |
| --- | --- | --- | --- |
| Panel Models | 504 | 44 | +460 |
| Max Power | 740 W | 460 W | +280 W |
| Avg Power | 456 W | 385 W | +71 W |


## Efficiency


| Measure | JA Solar | Solarwatt | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 24.80% | 23.00% | +1.80 pp |
| Avg Efficiency | 21.13% | 20.56% | +0.57 pp |


## Reliability & Warranty


| Measure | JA Solar | Solarwatt | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.322%/°C | -0.330%/°C | +0.008 |
| Bifacial Share | 238 (47%) | 22 (50%) | +3 pp |
| Avg Warranty | 27.9 yrs | 29.0 yrs | +1.1 yr |


## Efficiency distribution

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


| Efficiency band | JA Solar | Solarwatt |
| --- | --- | --- |
| \<20% | 112 (22.2%) | 13 (29.5%) |
| 20-21% | 99 (19.6%) | 19 (43.2%) |
| 21-22% | 112 (22.2%) | 2 (4.5%) |
| 22-23% | 107 (21.2%) | 9 (20.5%) |
| 23%+ | 74 (14.7%) | 1 (2.3%) |


## Power distribution

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


| Power band | JA Solar | Solarwatt |
| --- | --- | --- |
| \<400W | 142 (28.2%) | 20 (45.5%) |
| 400-499W | 173 (34.3%) | 24 (54.5%) |
| 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** (77%)


| Technology | JA Solar | Solarwatt |
| --- | --- | --- |
| PERC | 247 (49.0%) | 34 (77.3%) |
| TOPCon | 146 (29.0%) | 10 (22.7%) |
| 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, Solarwatt


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [SOLARWATT Panel vision M 5.0 460 Wp](https://comparepv.com/panel/solarwatt-solarwatt-panel-vision-m-5-0-460-wp) | 460 | 23.0 | -0.290 | Monocrystalline |
| 2 | [SOLARWATT Panel vision M 5.0 455 Wp](https://comparepv.com/panel/solarwatt-solarwatt-panel-vision-m-5-0-455-wp) | 455 | 22.8 | -0.290 | Monocrystalline |
| 3 | [SOLARWATT Panel vision M 5.0 450 Wp](https://comparepv.com/panel/solarwatt-solarwatt-panel-vision-m-5-0-450-wp) | 450 | 22.5 | -0.290 | Monocrystalline |
| 4 | [SOLARWATT Panel vision M 5.0 450Wp](https://comparepv.com/panel/solarwatt-solarwatt-panel-vision-m-5-0-450wp) | 450 | 22.5 | -0.290 | Monocrystalline |
| 5 | [vision M 5.0 450 Wp](https://comparepv.com/panel/solarwatt-vision-m-5-0-450-wp) | 450 | 22.5 | -0.290 | Monocrystalline |
| 6 | [SOLARWATT Panel vision M 5.0 445 Wp](https://comparepv.com/panel/solarwatt-solarwatt-panel-vision-m-5-0-445-wp) | 445 | 22.3 | -0.290 | Monocrystalline |
| 7 | [SOLARWATT Panel vision M 5.0 445Wp](https://comparepv.com/panel/solarwatt-solarwatt-panel-vision-m-5-0-445wp) | 445 | 22.3 | -0.290 | Monocrystalline |
| 8 | [vision M 5.0 445 Wp](https://comparepv.com/panel/solarwatt-vision-m-5-0-445-wp) | 445 | 22.3 | -0.290 | Monocrystalline |
| 9 | [SOLARWATT Panel vision M 5.0 440Wp](https://comparepv.com/panel/solarwatt-solarwatt-panel-vision-m-5-0-440wp) | 440 | 22.0 | -0.290 | Monocrystalline |
| 10 | [vision M 5.0 440 Wp](https://comparepv.com/panel/solarwatt-vision-m-5-0-440-wp) | 440 | 22.0 | -0.290 | Monocrystalline |


## Summary

JA Solar, founded in China in 2005, is one of the world's largest solar panel manufacturers, with production capacity exceeding 100 GW and a workforce of over 37,000 employees. It holds Tier 1 (bankable) status, making it eligible for large-scale project financing, and is listed on the Shenzhen Stock Exchange. Independent industry reviews consistently rank JA Solar among the top global brands, and the company earned Top Performer status for the tenth consecutive time in PVEL's 2025 Scorecard. Solarwatt, by contrast, is a German manufacturer headquartered in Dresden and founded in 1993 - one of the oldest solar companies in Europe. It does not hold Tier 1 status and operates with a narrower portfolio of 44 models. While Solarwatt has shifted physical production away from Germany in recent years, it retains its R&D, sales, and service operations there and continues to position itself as a premium European-engineered brand.

JA Solar's portfolio of 524 panels spans a wide power range, reaching up to 740 Wp, with an average efficiency of 20.87% and a peak of 24.4%. The dominant cell technology is PERC at roughly 52% of the lineup, complemented by growing TOPCon offerings. This breadth and scale makes JA Solar well-suited for utility-scale ground-mount projects, commercial and industrial (C&I) installations, and high-volume residential deployments where cost-per-watt optimization is the primary driver. The average temperature coefficient of -0.323%/°C ensures reliable output across climates. Solarwatt's 44-panel portfolio reaches a maximum of 460 Wp, with an average efficiency of 20.56% and 50% of the range being bifacial. The brand is best known for its pioneering double-glass construction - first introduced in 1998 - an industry-leading average warranty of nearly 29 years, and premium build quality. These attributes make Solarwatt a strong fit for residential rooftop installs and boutique commercial projects where long-term durability and brand confidence outweigh upfront cost sensitivity.

For buyers prioritizing scale, supply certainty, Tier 1 bankability, and competitive pricing - particularly for utility-scale or large commercial projects - JA Solar is the clear frontrunner. Solarwatt is the more compelling choice for premium residential or small commercial buyers who value European heritage, extended warranty coverage, and robust glass-on-glass construction, and who are less constrained by unit cost. Procurement teams should note that JA Solar's Tier 1 status is often a hard requirement for project finance, which limits Solarwatt's applicability in bankability-sensitive projects regardless of its quality credentials.

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 Solarwatt](https://comparepv.com/aiko-vs-solarwatt)
- [JA Solar vs AKCOME](https://comparepv.com/ja-solar-vs-akcome)
- [ARTsolar vs Solarwatt](https://comparepv.com/artsolar-vs-solarwatt)


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

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