LONGi Solar Panels: Monocrystalline & 30-Year Warranty

Rebor B.V. is EU wholesale distributor of LONGi Solar (LONGi Green Energy Technology Co., Ltd.) — one of the world's largest manufacturers of monocrystalline solar panels and consistently ranked as a Tier-1 manufacturer. Our range includes a selection from two current product lines: the Hi-MO X10 series based on HPBC 2.0 (Hybrid Passivated Back Contact) N-Type technology for residential and light-commercial installations, and the Hi-MO 7 series based on bifacial glass-glass technology for larger commercial and project-based installations. View the current models below for the exact Wp class and datasheet per model.

Two product lines: Hi-MO X10 (HPBC 2.0) and Hi-MO 7 (bifacial glass-glass)

The LONGi range at Rebor includes two product lines that differ both technologically and in terms of application. They are not interchangeable and target different installation profiles.

Hi-MO X10 — HPBC 2.0 N-Type with 0BB (residential)

HPBC 2.0 (Hybrid Passivated Back Contact) is LONGi's second-generation back-contact technology based on N-Type. Combined with a 0BB (Zero Busbar) structure, all electrical contacts are moved to the rear of the cell — there are no visible metal lines on the front. The result is a fully black or uniform front surface with maximum light absorption.

In practice: high module efficiency in the top segment for residential panels, a low temperature coefficient, Anti-Shading technology that reduces hotspot formation under partial shading, and an aesthetically distinctive Full Black or Black Frame appearance. The Hi-MO X10 line is available in Full Black, Black Frame and bifacial glass-glass Black Frame versions. Refer to the datasheet of the current model for the exact electrical parameters.

Hi-MO 7 — bifacial glass-glass (commercial/project)

The Hi-MO 7 series is designed for installations where high absolute power per panel, mechanical robustness and a long service life are the priority. The bifacial glass-glass construction (2.0 + 2.0 mm) captures light on both the front and rear, delivering additional yield on suitable surfaces (light roofing, ground). The silver frame version is optimised for professional project installations.

In practice: high absolute power per panel, maximum system voltage 1,500V DC, suitable for larger residential roofs, carports and ground-mounted systems. Note: the Hi-MO 7 line has a shorter product warranty than the Hi-MO X10 line — refer to the product page for the exact warranty period.

Hi-MO X10 ≠ Hi-MO 7 ≠ Hi-MO X6: The Hi-MO X6 series is no longer carried in our range. The current lines are Hi-MO X10 (HPBC 2.0 N-Type, residential) and Hi-MO 7 (bifacial glass-glass, commercial/project). HPBC is neither TOPCon nor PERC — it is LONGi's own back-contact architecture based on N-Type.

Technology comparison: Hi-MO X10 vs. Hi-MO 7

The comparison below is at series and technology level. Refer to the current product pages above for the exact specifications of the model carried.

Feature Hi-MO X10
HPBC 2.0 N-Type		 Hi-MO 7
Bifacial glass-glass
Cell technology HPBC 2.0 N-Type (0BB back-contact) Monocrystalline N-Type bifacial
Efficiency level Very high — top of the residential segment High — strong for commercial/project
Visible busbars front None (0BB structure) Standard
Construction Mono-glass (Full Black / Black Frame) or glass-glass bifacial (Black Frame) Glass-glass bifacial (2.0 + 2.0 mm)
Frame colour Full Black or Black Frame Silver frame
Shade tolerance Anti-Shading technology — reduces hotspot formation Standard bypass diode protection
Bifacial yield Depends on variant — refer to product page ✓ — additional rear-side yield on suitable surface
Max. system voltage 1,500V DC 1,500V DC
Product warranty 25 years 12 years
Power warranty 30 years linear 30 years linear
Typical application Residential roof, aesthetic installations, limited roof area Commercial roof, carport, ground-mounted systems, large projects

Which LONGi panel suits your project?
Situation Recommended line Key advantage
Residential roof, aesthetics as priority, Full Black or Black Frame required Hi-MO X10 — HPBC 2.0 0BB structure — no visible busbars, fully black appearance, high efficiency, 25-year product warranty
Residential roof with partial shading (chimney, dormer) Hi-MO X10 — HPBC 2.0 Anti-Shading technology reduces hotspot formation under partial shading
Commercial roof, carport or ground-mounted system, maximum absolute power per panel Hi-MO 7 — bifacial glass-glass High absolute power per panel, bifacial yield, robust glass-glass construction for demanding environments
Installation where bifacial rear-side yield is relevant (light surface, elevated mounting) Hi-MO 7 or Hi-MO X10 bifacial variant Both lines have bifacial variants — view current models above
Longest product warranty required Hi-MO X10 — HPBC 2.0 25-year product warranty vs. 12 years for the Hi-MO 7 line — both with 30-year power warranty

View the current models above for the exact Wp class and datasheet per model, or contact us via our contact page for tailored project advice.

Warranty and power degradation

LONGi applies a 30-year linear power warranty structure to both product lines. The product warranty differs per line.

Hi-MO X10 — HPBC 2.0 N-Type:

  • Product warranty: 25 years
  • Power warranty: 30 years linear
  • Low annual degradation — characteristic of N-Type HPBC architecture
  • Refer to the product page or datasheet of the current model for the exact degradation curve and residual output percentages

Hi-MO 7 — bifacial glass-glass:

  • Product warranty: 12 years
  • Power warranty: 30 years linear
  • Refer to the product page or datasheet of the current model for the exact degradation curve and residual output percentages
Note: The product warranty of the Hi-MO 7 line (12 years) is significantly shorter than that of the Hi-MO X10 line (25 years). Both lines carry a 30-year power warranty. Verify which warranty period is relevant for your project or financing structure.

Panel-inverter compatibility: operating current and MPPT range

All LONGi models in our range are compatible with modern 1,500V DC systems. When configuring a string, the open-circuit voltage (Voc) and short-circuit current (Isc) per model determine the number of panels per string and the inverter selection.

The Hi-MO X10 line has a high short-circuit current (Isc) due to the N-Type HPBC architecture. Verify before installation that your inverter supports the input current of the chosen model. The Hi-MO 7 line also has a high Isc due to the large cell surface — the same applies: check inverter specifications before purchase.

We supply LONGi panels preferably in combination with hybrid inverters from Solis and GoodWe — both brands support 1,500V DC systems. Refer to the datasheet of the current model for the exact Voc, Isc, Vmpp and Impp. For a tailored string calculation, refer to our battery calculator or technical support.

Environmental resistance and certifications

LONGi panels are certified to IEC 61215 and IEC 61730 — the international baseline standards for mechanical and electrical safety of PV modules. Salt mist resistance has been tested to IEC 61701, making the panels suitable for installations in coastal areas. Ammonia resistance has also been tested, making the panels suitable for agricultural environments.

The glass-glass construction of the Hi-MO 7 line and the bifacial Hi-MO X10 variants provides enhanced mechanical protection and resistance to micro-cracks. Both lines have been tested to a maximum static load of 5,400 Pa on the front and 2,400 Pa on the rear. Refer to the datasheet of the current model for the complete certification list and environmental specifications.

Diagnostic protocol: power loss and hotspot formation in LONGi panels

The Hi-MO X10 line features Anti-Shading technology that reduces hotspot formation under partial shading. Nevertheless, other causes can lead to unexpected power loss. The following protocol assists with diagnosis.

  1. Check inverter data. Compare the daily yield (kWh) of the relevant string with a reference period. A consistently lower pattern at specific times of day indicates a structural shading source or a fault in that string.
  2. Check for current clipping. The high short-circuit current (Isc) of both the Hi-MO X10 and Hi-MO 7 lines can cause current limiting in older or entry-level inverters. Check inverter logs for current clipping.
  3. Inspect the bifacial rear side (Hi-MO 7 and bifacial Hi-MO X10). Soiling or obstruction of the rear side (e.g. dirt accumulation in ground-mounted systems) reduces bifacial yield. Verify that the rear side is free of obstacles.
  4. Measure the open-circuit voltage (Voc) per string. A significantly lower Voc than the theoretical value may indicate a defective bypass diode or a damaged panel.
  5. Check the junction box and connectors. Visually inspect for moisture ingress or corrosion — particularly relevant for coastal installations. Use only compatible MC4 connectors and never mix different connector brands or types.
Note: A single instance of power loss in practice does not constitute evidence of a structural product defect. Power loss is in most cases caused by installation or environmental factors. If in doubt, engage a certified installer for a full system inspection.

Frequently asked questions about LONGi solar panels

What is HPBC 2.0 technology and what distinguishes it from TOPCon and PERC?

HPBC 2.0 (Hybrid Passivated Back Contact) is LONGi's second-generation back-contact technology based on N-Type. Combined with a 0BB (Zero Busbar) structure, all electrical contacts are moved to the rear — there are no visible metal lines on the front. This results in a fully black or uniform front surface with maximum light absorption and high module efficiency. TOPCon (Tunnel Oxide Passivated Contact) is an N-Type technology with contact lines on the front. PERC (Passivated Emitter and Rear Cell) is a P-Type technology with contact lines on the front. HPBC, TOPCon and PERC are three fundamentally different architectures — they are not interchangeable as terms.

What is the difference between the Hi-MO X10 line and the Hi-MO 7 line?

The Hi-MO X10 line uses HPBC 2.0 N-Type technology with a 0BB structure: no visible busbars on the front, high module efficiency, Anti-Shading technology and a 25-year product warranty. Available in Full Black, Black Frame and bifacial glass-glass versions — primarily targeting residential installations. The Hi-MO 7 line is a bifacial glass-glass panel with silver frame, designed for commercial roofs, carports and ground-mounted systems where high absolute power per panel and mechanical robustness are the priority. The product warranty of the Hi-MO 7 line is 12 years; the power warranty for both lines is 30 years. View the current models above for the exact specifications.

Are LONGi panels suitable for coastal areas?

Yes. LONGi panels have been tested for salt mist resistance to IEC 61701 and for ammonia resistance, making them suitable for installations in coastal areas and agricultural environments. The salt mist test validates the corrosion resistance of the frame, junction box and connectors under prolonged exposure to a salty marine climate.

What warranty structure does LONGi use?

LONGi applies a linear power warranty of 30 years to both product lines. The product warranty differs: the Hi-MO X10 line carries a product warranty of 25 years; the Hi-MO 7 line carries a product warranty of 12 years. Refer to the product page or datasheet of the current model for the exact degradation curve and residual output percentages.

Which inverters are compatible with LONGi panels?

All current LONGi models are compatible with modern 1,500V DC systems and work with hybrid inverters from Solis and GoodWe. Both LONGi lines have a high short-circuit current (Isc) — verify before installation that your inverter supports the input current of the chosen model. For an exact string calculation, refer to our battery calculator or technical support.

Where can I find the exact specifications of a LONGi model?

The exact specifications per model — including Wp, dimensions, weight, Voc, Isc, Vmpp, Impp, temperature coefficient, warranty period and degradation curve — are available on the individual product page and in the accompanying datasheet. View the current models above and click through to the product page for the complete technical overview.

How do LONGi panels compare to other brands in our range?

The LONGi Hi-MO X10 line (HPBC 2.0 N-Type, 0BB) stands out through its back-contact architecture with no visible busbars and Anti-Shading technology — a different approach from the N-Type TOPCon panels of DMEGC, JA Solar or Trina Solar. For the highest module efficiency in our range, Aiko ABC panels are the alternative — based on a different back-contact architecture (ABC vs. HPBC). The LONGi Hi-MO 7 line is comparable in application profile (commercial/project, bifacial glass-glass) to the bifacial variants of other Tier-1 brands. Use the battery calculator for a tailored system recommendation.