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

# JA Solar vs Wattpower

JA Solar has the broader catalog (504 vs 0 models). JA Solar leans bifacial (47% of lineup).


## The two companies


| Attribute | JA Solar | Wattpower |
| --- | --- | --- |
| Country | China | China |
| Headquarters | Beijing | Nanjing |
| Founded | 2005 | 2020 |
| Employees | 37,289 | 11-50 |
| Annual capacity | 100+ GW/year | 1-2 GW/year |
| Tier 1 | yes |  |
| Listed | SZSE: 002459 |  |
| Website | [https://www.jasolar.com](https://www.jasolar.com) | [https://www.watt-power.com](https://www.watt-power.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...

WattPower Technology Co., Ltd is a Chinese solar module manufacturer headquartered in Nanjing, Jiangsu. The company specializes in high-performance photovoltaic modules utilizing 182mm large-size silicon wafers combined with PERC, multi-busbar, half-cell, bifacial, and high-density encapsulation technologies. It...


## Catalog & Power


| Measure | JA Solar | Wattpower | Margin |
| --- | --- | --- | --- |
| Panel Models | 504 | 0 | +504 |
| Max Power | 740 W | 0 W | +740 W |
| Avg Power | 456 W | 0 W | +456 W |


## Efficiency


| Measure | JA Solar | Wattpower | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 24.80% | - |  |
| Avg Efficiency | 21.13% | - |  |


## Reliability & Warranty


| Measure | JA Solar | Wattpower | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.322%/°C | - |  |
| Bifacial Share | 238 (47%) | 0 (0%) | +47 pp |
| Avg Warranty | 27.9 yrs | - |  |


## Efficiency distribution

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


| Efficiency band | JA Solar | Wattpower |
| --- | --- | --- |
| \<20% | 112 (22.2%) | 0 |
| 20-21% | 99 (19.6%) | 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 | Wattpower |
| --- | --- | --- |
| \<400W | 142 (28.2%) | 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%)


| Technology | JA Solar | Wattpower |
| --- | --- | --- |
| PERC | 247 (49.0%) | 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 |


## Summary

JA Solar is one of the world's largest solar module manufacturers, founded in 2005 and headquartered in China, with a workforce of over 37,000 employees and a total annual production capacity exceeding 100 GW. The company holds confirmed Tier 1 bankable status from both S&P Global Commodity Insights and BloombergNEF, making it a preferred choice for project finance across institutional lenders globally. In the first half of 2025, JA Solar co-ranked first in Wood Mackenzie's Global Solar Module Manufacturer Ranking alongside Trinasolar, with a score of 91.7. Wattpower, by contrast, is a micro-scale Chinese manufacturer founded in 2020, with a reported headcount of only 11-50 employees and production capacity estimated at 1-2 GW. It does not appear on any Tier 1 list and has no documented product portfolio in the analyzed dataset, making side-by-side technical comparison largely one-sided.

JA Solar's portfolio spans 524 documented panel models, reaching up to 740 Wp in peak power output and 24.4% in maximum cell efficiency, with an average panel efficiency of approximately 20.9%. The dominant cell technology across its lineup is PERC - accounting for over 52% of models - complemented by an expanding TOPCon offering in its Deep Blue 4.0 series, which achieves efficiencies of 21.8-23%. Bifacial modules represent roughly 44% of the portfolio, positioning JA Solar well for residential rooftop installs, utility-scale ground-mount projects, and commercial C&I applications alike. The average temperature coefficient of -0.32%/°C per degree above 25°C is competitive for PERC technology, and the average warranty across the portfolio is nearly 28 years. Wattpower's ENF Solar listing references a power range of 385-700 Wp and technologies including PERC, bifacial, HJT, and TOPCon, but no independent reviews, performance data, or certifications could be verified through publicly available sources.

For international buyers - whether utility developers, EPC contractors, or residential installers - JA Solar is the clear choice between the two: it offers full bankability, a proven track record in European and global markets, a broad and well-documented product range, and strong warranty backing. Wattpower, given its very recent founding, minimal workforce, absence from Tier 1 lists, and lack of a verifiable public track record, carries significant counterparty and technical risk that most procurement standards and project finance requirements would not accommodate.

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


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

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