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

# JA Solar vs Vespa Solar Enerji

JA Solar has the broader catalog (504 vs 9 models). JA Solar leads on peak efficiency at 24.80%. Vespa Solar Enerji leans bifacial (100% of lineup).


## The two companies


| Attribute | JA Solar | Vespa Solar Enerji |
| --- | --- | --- |
| Country | China | Turkey |
| Headquarters | Beijing |  |
| Founded | 2005 |  |
| Employees | 37,289 |  |
| Annual capacity | 100+ GW/year |  |
| Tier 1 | yes | no |
| Listed | SZSE: 002459 |  |
| Website | [https://www.jasolar.com](https://www.jasolar.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 | Vespa Solar Enerji | Margin |
| --- | --- | --- | --- |
| Panel Models | 504 | 9 | +495 |
| Max Power | 740 W | 630 W | +110 W |
| Avg Power | 456 W | 514 W | +58 W |


## Efficiency


| Measure | JA Solar | Vespa Solar Enerji | Margin |
| --- | --- | --- | --- |
| Max Efficiency | 24.80% | 23.32% | +1.48 pp |
| Avg Efficiency | 21.13% | 21.31% | +0.18 pp |


## Reliability & Warranty


| Measure | JA Solar | Vespa Solar Enerji | Margin |
| --- | --- | --- | --- |
| Avg Temp Coefficient | -0.322%/°C | -0.334%/°C | +0.013 |
| Bifacial Share | 238 (47%) | 9 (100%) | +53 pp |
| Avg Warranty | 27.9 yrs | 30.0 yrs | +2.1 yr |


## Efficiency distribution

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


| Efficiency band | JA Solar | Vespa Solar Enerji |
| --- | --- | --- |
| \<20% | 112 (22.2%) | 0 |
| 20-21% | 99 (19.6%) | 3 (33.3%) |
| 21-22% | 112 (22.2%) | 5 (55.6%) |
| 22-23% | 107 (21.2%) | 0 |
| 23%+ | 74 (14.7%) | 1 (11.1%) |


## Power distribution

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


| Power band | JA Solar | Vespa Solar Enerji |
| --- | --- | --- |
| \<400W | 142 (28.2%) | 0 |
| 400-499W | 173 (34.3%) | 4 (44.4%) |
| 500-599W | 120 (23.8%) | 4 (44.4%) |
| 600-699W | 60 (11.9%) | 1 (11.1%) |
| 700W+ | 9 (1.8%) | 0 |


## Cell technology

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

Dominant cell tech: **PERC** (89%)


| Technology | JA Solar | Vespa Solar Enerji |
| --- | --- | --- |
| PERC | 247 (49.0%) | 8 (88.9%) |
| TOPCon | 146 (29.0%) | 1 (11.1%) |
| 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, Vespa Solar Enerji


| # | Model | Power | Efficiency | Temp. coefficient | Technology |
| --- | --- | --- | --- | --- | --- |
| 1 | [VSP630DM-G12RT-132H](https://comparepv.com/panel/vespa-solar-enerji-vsp630dm-g12rt-132h) | 630 | 23.3 | -0.290 | Monocrystalline |
| 2 | [VSP555T-M10-144H](https://comparepv.com/panel/vespa-solar-enerji-vsp555t-m10-144h) | 555 | 21.5 | -0.340 | Monocrystalline |
| 3 | [VSP550T-M10-144H](https://comparepv.com/panel/vespa-solar-enerji-vsp550t-m10-144h) | 550 | 21.3 | -0.340 | Monocrystalline |
| 4 | [VSP545T-M10-144H](https://comparepv.com/panel/vespa-solar-enerji-vsp545t-m10-144h) | 545 | 21.1 | -0.340 | Monocrystalline |
| 5 | [VSP540T-M10-144H](https://comparepv.com/panel/vespa-solar-enerji-vsp540t-m10-144h) | 540 | 20.9 | -0.340 | Monocrystalline |
| 6 | [VSP460T-M10-120H](https://comparepv.com/panel/vespa-solar-enerji-vsp460t-m10-120h) | 460 | 21.2 | -0.340 | Monocrystalline |
| 7 | [VSP455T-M10-120H](https://comparepv.com/panel/vespa-solar-enerji-vsp455t-m10-120h) | 455 | 21.0 | -0.340 | Monocrystalline |
| 8 | [VSP450T-M10-120H](https://comparepv.com/panel/vespa-solar-enerji-vsp450t-m10-120h) | 450 | 20.8 | -0.340 | Monocrystalline |
| 9 | [VSP445T-M10-120H](https://comparepv.com/panel/vespa-solar-enerji-vsp445t-m10-120h) | 445 | 20.6 | -0.340 | Monocrystalline |


## Summary

JA Solar, founded in 2005 and headquartered in China, is one of the largest solar module manufacturers in the world, with a workforce of over 37,000 employees and a total production capacity exceeding 100 GW. The company holds Tier 1 bankable status as recognized by S&P Global Commodity Insights and jointly topped Wood Mackenzie's Global Solar Module Manufacturer Ranking for H1 2025, with cumulative global shipments approaching 300 GW by mid-2025. Vespa Solar Enerji, by contrast, is a small Turkish manufacturer established around 2022 and based in Kayseri, Turkey. It does not hold Tier 1 status, carries only four panel models in the available dataset, and has only recently begun international sales - reported first exports to France and Ghana - making it a very early-stage player on the global stage.

JA Solar's portfolio of 524 panel models covers PERC (over 52% of the lineup), TOPCon, and other advanced cell technologies, reaching a peak output of 740 Wp and a maximum efficiency of 24.4%, with an average temperature coefficient of -0.323%/°C. This breadth makes JA Solar well-suited for residential rooftop installs, utility-scale ground-mount projects, and commercial C&I applications across European and global markets, supported by a well-established distribution and service network. Vespa Solar Enerji offers a more focused proposition: 100% of its current portfolio consists of bifacial PERC modules, with an average warranty of 30 years - modestly above JA Solar's portfolio average of 27.85 years - and average panel efficiency of approximately 20.9%. This narrow but fully bifacial range could suit small-to-medium ground-mount residential or C&I installations in markets where the manufacturer has built distribution relationships.

For international buyers - particularly in Europe - JA Solar represents the substantially lower-risk choice, underpinned by Tier 1 bankability, strong financial resilience, a fully global supply chain, and a decade of consistent top-performer results in PVEL reliability testing. Vespa Solar Enerji may appeal to buyers specifically seeking bifacial PERC modules with a 30-year warranty from a geographically proximate supplier, but the absence of Tier 1 status, a limited product track record, and a very small portfolio present meaningful risks for larger or bank-financed projects. For most professional procurement decisions, JA Solar's combination of scale, technology breadth, and established financial credibility gives it a clear and decisive advantage.

Written by claude-sonnet from the figures above.


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Source: https://comparepv.com/ja-solar-vs-vespa-solar-enerji

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