Longi Solar vs Seraphim - solar panel manufacturer comparison

LONGi Solar is a Chinese manufacturer headquartered in Xi'an, Shaanxi, founded in 2000 by Li Zhenguo and colleagues from Xi'an Jiaotong University, with origins in monocrystalline silicon for the semiconductor industry. Over more than two decades it has grown into one of the world's largest solar companies, with annual production capacity exceeding 110 GW across wafers, cells, and modules combined, and it shipped over 63 GW of cells and modules in the first nine months of 2025 alone. LONGi consistently holds Bloomberg NEF Tier 1 status and ranked sixth among global module manufacturers in 2025. Seraphim, formally Jiangsu Seraphim Solar System Co., Ltd., was established in 2011 in Changzhou, Jiangsu, and has held BNEF Tier 1 status for eleven consecutive years since 2015. Its current annual production capacity stands at approximately 13 GW, with manufacturing facilities in China, Vietnam, and South Africa. By any measure of institutional scale and global market weight, LONGi carries a substantially larger footprint.

LONGi's current flagship lineup centers on the Hi-MO series, with the Hi-MO X10 built around its proprietary HPBC 2.0 - Hybrid Passivated Back Contact - cell architecture, achieving module output of up to 670 W and efficiencies reported at up to 23.3% in select configurations. The portfolio spans residential rooftop, commercial and industrial, and utility-scale ground-mount applications. Seraphim addresses the same broad spectrum, with its Nebula TOPCon series representing the premium tier at up to 22.5% efficiency. The company has earned six PVEL Top Performer awards, which reflects consistently solid independent test results. A note of caution: SolarQuotes removed Seraphim from its recommended-brand list in April 2023 following reported issues with warranty claim handling in the Australian market, making regional after-sales support a point worth investigating before specifying the brand on any project.

For institutional buyers - utilities, large commercial developers, or project financiers requiring strong bankability documentation - LONGi is the stronger default choice, backed by its production scale, technology leadership in back-contact cell architecture, and deeply integrated global supply chain. Seraphim is a credible mid-tier option for residential and small commercial buyers seeking a BNEF-certified panel at a competitive price, but prospective buyers should confirm the quality of local warranty support through their specific distributor before committing.

Generated by Claude Sonnet · 2026-05-14