Q-Cells vs Viessmann - solar panel manufacturer comparison
Q-Cells has the broader catalog (89 vs 11 models). Q-Cells leads on peak efficiency at 23.20%. Q-Cells leans bifacial (39% 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
Qcells is a renowned global provider of complete energy solutions, specializing in solar cells and modules, energy storage solutions, downstream project business, and energy retail. The company has a strong heritage dating back to its foundation in Germany and has become a leader in technology innovations. As an...
- Founded
- 1999
- Headquarters
- Seoul, South Korea
- Annual capacity
- 11.2 GW/year
- Employees
- 2000+
- Listed
- NASDAQ: HQCL
- 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
Q-Cells skews to higher efficiency: 2% of lineup is 23%+
Q-Cells offers more 600W+ panels (19% of lineup)
Dominant cell tech: <strong>PERC</strong> (43%)
Dominant cell tech: <strong>PERC</strong> (73%)
The flagships
Written summary
Q-Cells traces its roots to Germany, where it was founded in 1999 in Bitterfeld-Wolfen before being acquired in 2012 by South Korea's Hanwha Group and operating today as the Hanwha Qcells Division. The brand holds BloombergNEF Tier 1 bankability status and operates what it describes as the largest solar manufacturing facility in the Western Hemisphere, located in Dalton, Georgia, with combined global annual capacity reported at around 11 GW. Viessmann is a German heating and energy systems conglomerate founded in 1917 and headquartered in Allendorf (Eder), with solar PV representing one segment of a broader portfolio spanning heat pumps, boilers, and home energy management. Viessmann's solar division does not appear on published BloombergNEF Tier 1 module-maker lists, and the company does not publish a comparable GW-scale production figure. On institutional scale and bankability, Hanwha Q-Cells has the demonstrably stronger footprint.
Hanwha Q-Cells addresses both residential and commercial buyers through two main module families: the Q.TRON series, built on TOPCon cell technology with efficiency cited at up to around 23.7% on high-output variants, and the Q.PEAK DUO series, a PERC-based line at more moderate price points. Its US manufacturing base and Tier 1 standing make it a widely specified choice for installers on both rooftop and mid-scale commercial projects. Viessmann's solar offer centers on the Vitovolt 300 range, where newer bifacial models use N-type TOPCon cells and reach up to 445 Wp per product data, alongside an older PERC line. Viessmann's real competitive edge is system integration - its panels are designed to pair with Viessmann heat pumps and home energy storage, giving the brand particular traction in European residential markets and earning it the EUPD Top Brand PV designation in Germany.
For buyers seeking standalone solar panels - whether for a US rooftop or a mid-scale commercial system - Hanwha Q-Cells is the clearer default in 2025, backed by confirmed Tier 1 bankability, a domestic US manufacturing option, and broad installer support. Viessmann becomes more compelling for European homeowners already committed to the Viessmann heating ecosystem, where integrated PV-and-heat-pump packages add genuine value. Outside that scenario the two brands are not interchangeable: Q-Cells is a dedicated solar manufacturer operating at scale, while Viessmann treats solar as one component among many.
Generated by Claude Sonnet · 2026-05-27
Other brand comparisons
Shop prices: See 25 Q-Cells offers · See 5 Viessmann 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.