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

# Esse Solar vs JA Solar

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


## The two companies


| Attribute | Esse Solar | JA Solar |
| --- | --- | --- |
| Country | Italy | China |
| Headquarters | Gallarate | Beijing |
| Founded | 1991 | 2005 |
| Employees | 11-50 | 37,289 |
| Annual capacity |  | 100+ GW/year |
| Tier 1 |  | yes |
| Listed |  | SZSE: 002459 |
| Website |  | [https://www.jasolar.com](https://www.jasolar.com) |

Esse Solar is an Italian company that provides solar solutions to solar professionals, businesses, and individuals who want to improve their energy efficiency. The company was founded in 1991 and is based in Gallarate. Esse Solar has raised $6.54M in funding from VAM Investments.

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


## Efficiency


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


## Reliability & Warranty


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


## Efficiency distribution

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


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


## Power distribution

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


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


## Cell technology

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


| Technology | Esse Solar | JA Solar |
| --- | --- | --- |
| PERC | 0 | 247 (49.0%) |
| TOPCon | 0 | 146 (29.0%) |
| N-type | 0 | 90 (17.9%) |
| Unknown | 0 | 16 (3.2%) |
| HJT | 0 | 5 (1.0%) |


## 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

Esse Solar is an Italian company founded in 1991, headquartered in Gallarate, Italy, with a workforce of 11 to 50 employees. The company operates primarily as a photovoltaic system integrator and turnkey solution provider rather than a solar panel manufacturer - no panels are registered under the Esse Solar brand in industry databases, and the company is known to source modules from third-party suppliers including Trina Solar and LONGi Solar. JA Solar, by contrast, is one of the world's largest solar module manufacturers, founded in 2005 in China and employing over 37,000 people. Listed on the Shenzhen Stock Exchange (SZSE) and holding Tier 1 bankable status per Bloomberg NEF, JA Solar was jointly ranked first globally alongside Trinasolar by Wood Mackenzie in H1 2025 - a position backed by a manufacturing capacity exceeding 100 GW per year and an approximately 11% global module shipment market share in 2024.

JA Solar's catalog of 524 panel models covers a broad power range, with the top-rated module reaching 740 Wp, average efficiency around 20.9%, and peak module efficiency of 24.4%. The portfolio is led by proven PERC cell technology (over 52% of the lineup), with bifacial panels making up approximately 44% of the range - positioning the brand well for residential rooftop installs, commercial and industrial (C&I) projects, and large utility-scale ground-mount systems alike. An average warranty term of nearly 28 years reflects strong long-term manufacturer confidence. Esse Solar, as an integrator rather than a manufacturer, offers no comparable technical product portfolio; its value proposition centers on local Italian expertise in project delivery, tax incentive management, and end-to-end installation services.

For international buyers comparing these two entities, the distinction is fundamental: JA Solar is a bankable, globally available module manufacturer with verified technical specifications and supply chain depth suitable for procurement at any scale, while Esse Solar is a regional Italian EPC and integration partner best evaluated in the context of on-the-ground project execution in Italy. The two are not directly comparable as panel suppliers, and any project requiring certified, independently tested modules in volume would naturally default to JA Solar.

Written by claude-sonnet from the figures above.


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