LONGi Solar Brand Guide: Hi-MO Series, BC Cell Technology & Dealer Specs
By the PES Supply Editorial Team
LONGi Green Energy Technology is the world's largest manufacturer of monocrystalline silicon solar products and one of the most technologically aggressive Tier 1 module makers in the industry. As an authorized PES Supply dealer partner, we carry a broad selection of LONGi Hi-MO modules within our catalog of 50,000+ SKUs from 169 authorized brands. This guide covers LONGi's company background, Hi-MO product family, proprietary back-contact (BC) cell technology, warranty terms, and the top modules available through PES Supply.
LONGi's transition from conventional PERC to its proprietary HPBC back-contact platform positions it at the efficiency frontier. For the full lineup of solar panels, browse our inventory — or jump to Shop LONGi Solar Products below.
1. Company Overview
LONGi was founded in 2000 and is headquartered in Xi'an, Shaanxi Province, China. Originally a monocrystalline silicon ingot and wafer specialist, the company vertically integrated into cells and modules and is now publicly listed on the Shanghai Stock Exchange. LONGi pioneered the industry-wide shift from polycrystalline to monocrystalline cells in the mid-2010s and has held the title of the world's largest mono-crystalline manufacturer by capacity for most of the past decade.
LONGi consistently ranks among the top three global module shippers and operates manufacturing campuses across China, with additional capacity in Vietnam and Malaysia. It is a BloombergNEF Tier 1 manufacturer. The company holds multiple independently certified world efficiency records, including a 25.4% module efficiency certified by Fraunhofer ISE in April 2025 and a 27.81% back-contact cell efficiency certified by ISFH ([Smart Solar Homes](https://smartsolarhomes.co.uk/articles/longi-solar-panels-review-uk)).
2. Current Product Lines
LONGi's active module portfolio is organized under the Hi-MO family, increasingly built on its proprietary HPBC (Hybrid Passivated Back Contact) cell architecture rather than conventional TOPCon:
- Hi-MO 6 — First-generation HPBC modules for the residential and C&I rooftop market, delivering up to 22.8% efficiency with a sleek full-black aesthetic. Launched as LONGi's mass-market BC entry point.
- Hi-MO 7 — Second-generation HPBC 2.0 modules pushing efficiency above 23%, with higher power classes optimized for utility and large C&I projects ([SolarInfo](https://www.solarinfo.ie/solar-panel-brands/longi)).
- Hi-MO X10 — LONGi's current flagship, built on HPBC 2.0 (Hybrid Passivated Back Contact) technology. Reaches 670 W power output, 24.8% module efficiency, and 26.6% cell efficiency, outperforming conventional TOPCon modules by roughly 30 W ([LONGi](https://www.longi.com/eu/news/hi-mo-x10-dach-launch/)). Available in Explorer (residential) and Guardian variants.
- Hi-MO S10 (EcoLife Pro) — A heterojunction back-contact (HIBC) module delivering a world-leading cell efficiency of 27.3% and module efficiency up to 25%, the first commercialized HIBC module ([LONGi press](https://eu.longi.com/press/longi-launches-25-efficient-heterojunction-back-contact-hbc-module-and-new-consumer-solar-brand-ecolife)).
- Legacy Hi-MO 4 / Hi-MO 5 — Earlier PERC-based mono modules still installed in the field but superseded in production.
3. Recent Releases (2025–2026)
LONGi's defining 2025 launches center on its second-generation BC platform. The Hi-MO X10 became available in the DACH region in March 2025, featuring the new proprietary HPBC 2.0 back-contact cell technology — a 670 W module at 24.8% efficiency that LONGi says outperforms conventional TOPCon modules by 30 W ([LONGi](https://www.longi.com/eu/news/hi-mo-x10-dach-launch/)).
In 2025 LONGi also debuted the Hi-MO S10 (EcoLife Pro), the first commercialized heterojunction back-contact (HIBC) module, achieving 25% module efficiency and 27.3% cell efficiency — a new commercial benchmark for the photovoltaic industry ([LONGi](https://eu.longi.com/press/longi-launches-25-efficient-heterojunction-back-contact-hbc-module-and-new-consumer-solar-brand-ecolife)). These releases signal LONGi's strategic pivot away from PERC and toward back-contact technology as its volume platform.
4. Certifications & Listings
- UL 61730 and IEC 61215 / IEC 61730 — North American and international module safety and design qualifications ([LONGi datasheet](https://static.longi.com/Hi_MO_X10_Explorer_LR_7_54_HVH_475_490_M_30_30_and_15_Frame_e909d07793.pdf)).
- IEEE 1547 inverter interconnection compatibility.
- BloombergNEF Tier 1 bankability listing.
- Buy America / BABA — LONGi does not manufacture in the United States, so its modules are not Buy America-compliant. For federally funded domestic-content projects, choose US-made alternatives from PES Supply.
5. Warranty Terms
LONGi's HPBC 2.0 modules (Hi-MO X10) offer a premium warranty package:
- Product (materials/processing) warranty: 15 years standard, with extended options up to 25 years in select markets ([LONGi Hi-MO X10 datasheet](https://static.longi.com/Hi_MO_X10_Explorer_LR_7_54_HVH_475_490_M_30_30_and_15_Frame_e909d07793.pdf)).
- Performance warranty: 30-year linear power output guarantee. First-year degradation is low and annual degradation is held to approximately 0.35–0.4%/year, ensuring strong retained output over the module lifetime.
The warranty start date is the date of delivery to the initial customer (or six months after ex-factory shipment, whichever is earlier). As a PES Supply authorized dealer, you file claims through our support team using your PES Supply invoice as proof of purchase. We handle serial verification and coordinate LONGi's RMA and replacement process.
6. PES Supply Authorized Dealer
PES Supply is an authorized LONGi dealer, supplying genuine factory-direct Hi-MO modules backed by the full manufacturer warranty. Dealer benefits include:
- Genuine, warrantied product with complete chain-of-custody documentation.
- Stock availability across popular Hi-MO 6/7 residential and Hi-MO X10 commercial configurations.
- Lead times: In-stock orders ship within 7–10 business days delivery. For project-scale allocations, contact our sales team for current ETAs.
- Volume pricing for contractors, EPCs, and developers.
7. Popular LONGi Products at PES Supply
| Model | Watts | Cell Tech | Efficiency | Dimensions | Warranty | Price Range |
|---|---|---|---|---|---|---|
| Hi-MO 6 Explorer (LR5-54HTH) | 425–450 W | HPBC (p-type BC) | 21.5–22.8% | 1722 × 1134 × 30 mm | 15-yr product / 25-yr power | $0.30–$0.36/W |
| Hi-MO 7 (LR7-72HTH) | 575–590 W | HPBC 2.0 | 22.4–23.2% | 2278 × 1134 × 30 mm | 15-yr product / 30-yr power | $0.28–$0.34/W |
| Hi-MO X10 Explorer (LR7-54HVH) | 475–490 W | HPBC 2.0 (N-type BC) | 23.5–24.8% | 1880 × 1134 × 30 mm | 15-yr product / 30-yr power | $0.32–$0.40/W |
| Hi-MO X10 (LR7-72HVH) | 640–670 W | HPBC 2.0 (N-type BC) | 24.0–24.8% | 2384 × 1134 × 30 mm | 15-yr product / 30-yr power | $0.30–$0.38/W |
Hi-MO X10 reaches 670 W at 24.8% module efficiency, outperforming conventional TOPCon by ~30 W ([LONGi](https://www.longi.com/eu/news/hi-mo-x10-dach-launch/)). Prices are contractor estimates and vary with volume and market conditions.
8. Technical Comparison
| Brand | Flagship Tech | Peak Module Efficiency | Product Warranty | Price Position |
|---|---|---|---|---|
| LONGi | HPBC 2.0 back contact | 24.8% (25% HIBC) | 15–25 yr | Mid-range |
| JA Solar | N-type TOPCon | 23.4% (24.8% on 5.0) | 25 yr | Mid-range (value) |
| Jinko | N-type TOPCon | 23.4% (24.8% on 3.0) | 25 yr | Mid-range (value) |
| REC | HJT | 22.6% | 20 yr | Premium |
LONGi's differentiation is its back-contact cell architecture, which eliminates front-side busbars to boost active cell area and aesthetics. Its 25% HIBC cell-to-module efficiency is among the highest commercially available, though the standard 15-year product warranty is shorter than JA Solar's or Jinko's 25-year coverage — a factor to weigh on bankability-sensitive projects.
9. Installation Notes
- Frame: Anodized aluminum alloy, available in 30 mm and dual 30/30 mm + 15 mm reinforced profiles for high-snow-load regions.
- Connectors: MC4-compatible PV connectors.
- Junction box: IP68-rated with bypass diodes for shade management.
- Glass: 3.2 mm tempered anti-reflective glass (mono) or 2.0 mm dual-glass on bifacial variants.
- Mechanical load: Rated up to 5400 Pa front / 2400 Pa rear (verify per model; some X10 variants handle higher loads with reinforced frames).
- Mounting compatibility: Standard four-point clamping compatible with IronRidge, Unirac, and other major racking systems. Refer to the model-specific install manual for clamp zones.
10. Frequently Asked Questions
What does HPBC mean?
HPBC stands for Hybrid Passivated Back Contact — LONGi's proprietary cell architecture that moves all front busbars to the rear of the cell, increasing the light-absorbing front surface area for higher efficiency and a cleaner aesthetic.
Is the Hi-MO X10 better than TOPCon modules?
The Hi-MO X10 reaches 24.8% module efficiency and outperforms conventional TOPCon modules by roughly 30 W at equivalent size, according to LONGi ([LONGi](https://www.longi.com/eu/news/hi-mo-x10-dach-launch/)). Whether it is "better" depends on your project's price sensitivity and whether the efficiency gain offsets the typically higher module cost.
Are LONGi panels Buy America-compliant?
No. LONGi manufactures in China, Vietnam, and Malaysia, so its modules do not qualify under the Buy America Act or BABA. PES Supply carries BABA-compliant US-made options from Mission Solar and Silfab for federally funded projects.
What is LONGi's warranty?
HPBC 2.0 modules (Hi-MO X10) carry a 15-year product warranty (extendable in some markets) and a 30-year linear performance warranty. The warranty start date is the delivery date to the original customer.
What is the lead time from PES Supply?
In-stock LONGi modules ship within 7–10 business days delivery. Contact our sales team for project-scale allocation and ETAs on specific Hi-MO X10 configurations.
11. Shop LONGi Solar Products
Source LONGi Hi-MO modules for residential, commercial, and utility projects through PES Supply. Browse the full range of solar panels or view LONGi-specific listings:
Shop LONGi Solar Products at PES Supply →
PES Supply (https://www.portlandiaelectric.supply) is a B2B electrical and solar distributor offering 50,000+ SKUs from 169 authorized brands. Verify all specifications against the manufacturer's current datasheet before final design.