JA Solar vs VSUN - solar panel manufacturer comparison
JA Solar has the broader catalog (504 vs 111 models). JA Solar leads on peak efficiency at 24.80%. VSUN leans bifacial (75% of lineup).
Both catalogues are read from the manufacturers' own datasheets. A brand is not scored against the market here, only against the other brand on this page.
The two companies
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...
- Founded
- 2005
- Headquarters
- Beijing, China
- Annual capacity
- 100+ GW/year
- Employees
- 37,289
- Listed
- SZSE: 002459
- Tier 1 bankable
- Yes
Catalogue against catalogue
An average over a catalogue describes the range a manufacturer publishes, not the module you would buy. A brand with two flagship panels and eighty older ones averages worse than one that has retired its back catalogue.
What each of them builds
JA Solar skews to higher efficiency: 15% of lineup is 23%+
VSUN offers more 600W+ panels (29% of lineup)
Dominant cell tech: <strong>PERC</strong> (49%)
Dominant cell tech: <strong>TOPCon</strong> (72%)
The flagships
Written summary
JA Solar, founded in 2005 in China and listed on the Shenzhen Stock Exchange (SZSE), is one of the world's largest solar panel manufacturers, with a workforce exceeding 37,000 employees and an annual production capacity of over 100 GW. Its Tier 1 bankable status makes it a standard reference for project finance-backed installations worldwide. VSUN, founded in 2012 and headquartered in Germany, operates at a markedly smaller scale with a focused portfolio of 111 modules and no Tier 1 classification - a distinction that carries weight for institutional lenders and large-scale project developers. JA Solar's production scale and global supply chain give it a competitive pricing advantage and procurement reliability that VSUN cannot yet match.
JA Solar's 524-module lineup is anchored by PERC technology (52.1% of the portfolio), reaching a maximum output of 740 Wp and a peak efficiency of 24.4%, making it well-suited for residential rooftop installs, utility-scale ground-mount projects, and commercial C&I applications alike. VSUN takes a technology-forward position, with TOPCon cells representing 72.1% of its range. Its average module efficiency of 21.71% outpaces JA Solar's 20.87%, and its temperature coefficient of -0.308%/°C compares favorably to JA Solar's -0.323%/°C, translating to lower thermal power losses in warm climates. VSUN's bifacial share of 74.77% - nearly double JA Solar's 44.27% - combined with an average warranty of approximately 29.7 years (versus 27.9 years for JA Solar) makes it an appealing candidate for bifacial ground-mount projects and buyers who prioritize long-term performance guarantees.
For buyers who require a proven, bankable supplier across diverse project types and geographies, JA Solar is the lower-risk, higher-availability choice with the institutional backing to support large-scale procurement. VSUN is better suited for technically sophisticated buyers who specifically seek N-type TOPCon performance, higher bifacial yield, and extended warranty terms, and who are prepared to conduct thorough supplier due diligence in the absence of a Tier 1 rating.
Generated by Claude Sonnet · 2026-05-12
Other brand comparisons
Shop prices: See 391 JA Solar offers · See 3 VSUN offers
Comparisons are computed from manufacturer datasheets held in the ComparePV database and may not reflect a brand's complete current lineup. Nothing on this page is paid placement.