---
title: "JA Solar vs WINAICO - Brand Comparison | ComparePV"
description: "Compare JA Solar vs WINAICO solar panels: full portfolio, efficiency, cell technology breakdown, warranty terms and company background."
source: "https://comparepv.com/ja-solar-vs-winaico"
image: "https://comparepv.com/og/compare/manufacturers/ja-solar/winaico.png"
---

# JA Solar vs WINAICO

JA Solar has the broader catalog (504 vs 44 models). WINAICO leads on peak efficiency at 25.00%. WINAICO leans bifacial (77% of lineup).


## The two companies


| Attribute | JA Solar | WINAICO |
| --- | --- | --- |
| Country | China | Taiwan |
| Headquarters | Beijing | Hsinchu |
| Founded | 2005 | 2003 |
| Employees | 37,289 | 100-500 |
| Annual capacity | 100+ GW/year | 0.1-1 GW/year |
| Tier 1 | yes | yes |
| Listed | SZSE: 002459 |  |
| Website | [https://www.jasolar.com](https://www.jasolar.com) | [https://winaico.com](https://winaico.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...

WINAICO is a Taiwanese manufacturer of high-performance crystalline silicon photovoltaic modules, operating as an independent subsidiary of Win Win Precision Technology. The company focuses on premium-quality solar panels backed by long warranty periods and has built a strong reputation in markets such as Germany...


## Catalog & Power


| Measure | JA Solar | WINAICO | Margin |
| --- | --- | --- | --- |
| Panel Models | 504 | 44 | +460 |
| Max Power | 740 W | 675 W | +65 W |
| Avg Power | 456 W | 491 W | +34 W |


## Efficiency


| Measure | JA Solar | WINAICO | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 24.80% | 25.00% | +0.20 pp |
| Avg Efficiency | 21.13% | 22.99% | +1.85 pp |


## Reliability & Warranty


| Measure | JA Solar | WINAICO | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.322%/°C | -0.284%/°C | +0.038 |
| Bifacial Share | 238 (47%) | 34 (77%) | +30 pp |
| Avg Warranty | 27.9 yrs | 28.9 yrs | +1.0 yr |


## Efficiency distribution

WINAICO skews to higher efficiency: 59% of lineup is 23%+


| Efficiency band | JA Solar | WINAICO |
| --- | --- | --- |
| \<20% | 112 (22.2%) | 0 |
| 20-21% | 99 (19.6%) | 4 (9.1%) |
| 21-22% | 112 (22.2%) | 7 (15.9%) |
| 22-23% | 107 (21.2%) | 7 (15.9%) |
| 23%+ | 74 (14.7%) | 26 (59.1%) |


## Power distribution

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


| Power band | JA Solar | WINAICO |
| --- | --- | --- |
| \<400W | 142 (28.2%) | 0 |
| 400-499W | 173 (34.3%) | 27 (61.4%) |
| 500-599W | 120 (23.8%) | 12 (27.3%) |
| 600-699W | 60 (11.9%) | 5 (11.4%) |
| 700W+ | 9 (1.8%) | 0 |


## Cell technology

Dominant cell tech: PERC (49%)

Dominant cell tech: Back Contact (41%)


| Technology | JA Solar | WINAICO |
| --- | --- | --- |
| PERC | 247 (49.0%) | 0 |
| TOPCon | 146 (29.0%) | 4 (9.1%) |
| N-type | 90 (17.9%) | 8 (18.2%) |
| Unknown | 16 (3.2%) | 10 (22.7%) |
| HJT | 5 (1.0%) | 4 (9.1%) |
| Back Contact | 0 | 18 (40.9%) |


## 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, WINAICO


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [WST-675BKX72-A2](https://comparepv.com/panel/winaico-wst-675bkx72-a2) | 675 | 25.0 | -0.260 | Monocrystalline |
| 2 | [WST-670BKX72-A2](https://comparepv.com/panel/winaico-wst-670bkx72-a2) | 670 | 24.8 | -0.260 | Monocrystalline |
| 3 | [WST-665BKX72-A2](https://comparepv.com/panel/winaico-wst-665bkx72-a2) | 665 | 24.6 | -0.260 | Monocrystalline |
| 4 | [WST-630NHX66-A4](https://comparepv.com/panel/winaico-wst-630nhx66-a4) | 630 | 23.3 | -0.240 | Monocrystalline |
| 5 | [WST-625NHX66-A4](https://comparepv.com/panel/winaico-wst-625nhx66-a4) | 625 | 23.1 | -0.240 | Monocrystalline |
| 6 | [WST-585NGX72-A7](https://comparepv.com/panel/winaico-wst-585ngx72-a7) | 585 | 22.6 | -0.290 | Monocrystalline |
| 7 | [WST-540NGX-D3](https://comparepv.com/panel/winaico-wst-540ngx-d3) | 540 | 22.8 | -0.300 | Monocrystalline |
| 8 | [WST-530NGX-D3](https://comparepv.com/panel/winaico-wst-530ngx-d3) | 530 | 22.3 | -0.300 | Monocrystalline |
| 9 | [WST-525NCX54-AW](https://comparepv.com/panel/winaico-wst-525ncx54-aw) | 525 | 23.6 | -0.280 | Monocrystalline |
| 10 | [WST-520NCX54-AW](https://comparepv.com/panel/winaico-wst-520ncx54-aw) | 520 | 23.4 | -0.280 | Monocrystalline |


## Summary

JA Solar is a Chinese module manufacturer operating since 2005, with headquarters cited variously as Beijing or Shanghai, and more than a dozen factories across China plus production sites in Vietnam and Malaysia. The company shipped nearly 300 GW of modules cumulatively by mid-2025, was named a 2025 Tier 1 PV module supplier by S&P Global Commodity Insights, and ranked first in Wood Mackenzie's manufacturer ranking for the first half of 2025. WINAICO is a Taiwan-based manufacturer operating since roughly 2008, part of the Win Win Precision Technology group headquartered in Hsinchu, also carrying Tier 1 status from Bloomberg New Energy Finance, but at a vastly smaller scale - estimates of annual capacity range from around 180-200 MW to just over 1 GW, a fraction of JA Solar's tens-of-gigawatts annual output. On institutional footprint and production volume, JA Solar is clearly the larger, more diversified player.

Both brands rely on TOPCon cell technology in their current flagship lines, though JA Solar deploys it at far greater scale: modules like the DeepBlue 5.0 (up to 670 W, up to 24.8% efficiency) and DesertBlue (650 W) target utility-scale ground-mount farms and C&I projects, while the company also sells into the residential rooftop segment at a comparatively low price per watt. WINAICO, by contrast, focuses almost exclusively on residential and commercial rooftop installations, with N-type monocrystalline modules (such as the WST-MGX series) rated up to about 22.3% efficiency, positioned at a premium price point, and its full 25-year product warranty is often conditional on installation by a WINAICO-approved installer.

For a typical international buyer putting panels on a roof, WINAICO is a solid, bankable, well-reviewed choice, though it carries a smaller manufacturing footprint and a higher price tag. JA Solar is the stronger default for utility-scale or cost-sensitive projects where global availability and documented bankability at the largest scale matter most, though owner feedback on real-world output versus installer projections is mixed. The two brands are not simple substitutes for each other - the right choice depends on project scale and buyer priorities.

Written by claude-sonnet-5 from the figures above.


## Other comparisons

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


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

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