LONGi Solar Panels Review: Hi-MO X10, HPBC 2.0 & Pricing

Yes. LONGi is the world's largest solar panel manufacturer by volume, a Bloomberg Tier 1 brand, and one of the most-fitted panels in the UK. Its premium Hi-MO X10 series uses HPBC 2.0 back-contact cells reaching 24%+ efficiency, while the mainstream Hi-MO 6 line offers strong value. All come with a 25-year product warranty and 30-year performance guarantee, backed by a financially stable manufacturer.

HPBC stands for Hybrid Passivated Back Contact. It is LONGi's back-contact cell technology, used in the Hi-MO X10 series, where the electrical contacts sit on the rear of the cell rather than the front. This removes front-side busbar shading, lifts efficiency to 24%+, and gives the panel a clean all-black look. It competes with Aiko's ABC and SunPower/Maxeon's IBC cells.

LONGi panels typically cost £160–£300 per panel installed in the UK. Mainstream Hi-MO 6 TOPCon panels sit at the lower end, close to JA Solar and Jinko; the premium Hi-MO X10 back-contact panels sit at the upper end. A full 5 kW system (around 11 panels) costs roughly £6,500–£8,500 installed including 0% VAT in 2026.

Hi-MO 6 is LONGi's mainstream line, available in both TOPCon (Explorer) and earlier HPBC (Scientist) variants at around 21.5–22.8% efficiency and 410–445W. Hi-MO X10 is the premium flagship using the newer HPBC 2.0 back-contact cells, reaching 23–24%+ efficiency and up to 470W. X10 costs more but offers higher efficiency, better degradation, and a cleaner all-black look.

Both make premium back-contact panels (LONGi HPBC vs Aiko ABC). Aiko Neostar edges ahead on peak efficiency and per-panel wattage (up to 485W vs 470W), but LONGi has far wider UK availability, a longer track record, and is usually £20–£50 cheaper per panel. LONGi is the safer choice for sourcing; Aiko suits a very small roof needing maximum watts.

Yes. LONGi is consistently listed as a Bloomberg Tier 1 solar manufacturer, a financial-bankability ranking rather than a quality score. As the world's largest panel maker with strong finances, LONGi is among the most bankable brands, which is reassuring for the credibility of a 25-year warranty.

LONGi's Hi-MO X10 and Hi-MO 9 panels carry a 25-year product warranty covering manufacturing defects and a 30-year performance warranty guaranteeing around 88.85% of rated output at year 30. First-year degradation is capped at about 1%, with roughly 0.35–0.4% maximum annual degradation thereafter. Mainstream Hi-MO 6 terms are similar.

Yes. LONGi's N-type cells perform well in diffuse, low-light conditions common in the UK, holding a higher percentage of rated output on cloudy days than older P-type PERC panels. A low temperature coefficient also means less output loss on warm summer days. LONGi panels are a proven, reliable choice for UK conditions.

LONGi panels are made by LONGi Green Energy Technology Co., Ltd, headquartered in Xi'an, China, with wafer, cell and module facilities across China plus overseas capacity in Malaysia and Vietnam. LONGi is the world's largest monocrystalline wafer and solar panel producer, listed on the Shanghai Stock Exchange (ticker SH:601012).

LONGi solar panels are made by LONGi Green Energy Technology Co., Ltd, a publicly listed Chinese company founded in 2000. It is the world's largest manufacturer of monocrystalline silicon wafers and solar panels, with over 100 GW of annual module capacity and multiple world records for solar cell and module efficiency.

Both are huge Tier 1 manufacturers with wide UK availability and similar warranties. At the mainstream tier, LONGi Hi-MO 6 and Jinko Tiger Neo (both N-type TOPCon, ~22.5%, 430–450W) are very close on price and performance. The differentiator is LONGi's premium Hi-MO X10 back-contact option, which offers higher efficiency than anything in Jinko's residential range.

JA Solar DeepBlue 4.0 and LONGi Hi-MO 6 both use N-type TOPCon cells at around 22.5% efficiency and 430–450W, with similar pricing, warranties and UK availability. The key difference is LONGi's premium Hi-MO X10 back-contact line, which reaches 24%+ efficiency, something JA Solar doesn't match at residential scale.

Hi-MO X10 is worth the premium if you have limited roof space and need maximum power per square metre, or you want the cleanest all-black aesthetic with top efficiency. If you have a large roof with plenty of space, a mainstream LONGi Hi-MO 6 or another TOPCon panel will give better value per watt. The efficiency advantage matters most on smaller roofs.

LONGi panels are not sold direct to consumers; they're supplied via MCS-certified installers and trade distributors. To buy LONGi Hi-MO panels, request quotes from MCS-certified installers and specify the exact series (Hi-MO X10 or Hi-MO 6). Compare at least 3 quotes, confirm the model and wattage on the quote, and ask about the warranty claim process before signing.

Yes. Full datasheets for every Hi-MO model are published on the LONGi website under Products. They include rated power, efficiency, dimensions, weight, temperature coefficients, mechanical load ratings, and warranty terms. Ask your installer for the datasheet revision matching the exact modules they'll deliver, as specifications can be revised between production batches and markets.