The LONGi Hi-MO X10 LR7-60HVD-535M is a 535 Wp monocrystalline bifacial solar panel from the Scientist series, built around LONGi's latest HPBC 2.0 (Hybrid Passivated Back Contact) cell technology. HPBC 2.0 moves the electrical contacts to the rear of the cell, removing the front-side busbars that ordinarily block light — the result is a clean, fully black front face with no visible gridlines, paired with genuine bifacial energy gain from the rear.
A dual glass construction (2.0 mm tempered front glass plus 2.0 mm semi-tempered rear glass) gives the module a transparent back sheet that allows sunlight reflected from the roof, ground or rooftop membrane to reach the rear side of the cells, adding measurable extra yield without any additional roof space. The 120 half-cut cell layout reduces internal resistance and limits the impact of partial shading, while the anodised black aluminium frame keeps the aesthetic seamless on both residential and commercial roofs.
Built on N-type TaiRay wafer material, the panel achieves up to 23.7% module efficiency at this power class, with <1% first-year degradation and only 0.35% annual degradation from year 2 onward — backed by LONGi's 30-year linear power warranty and a UK/Ireland-specific 25-year materials and workmanship warranty.
Bifacial
Dual Glass Design
Installation Requirement: This panel must be installed by MCS-certified solar PV installers in accordance with the LONGi installation manual, IEC 61215/61730 requirements, and current UK wiring regulations (BS 7671). Maximum system voltage and series fuse ratings above must not be exceeded when sizing the array string.
Key Features
HPBC 2.0 Back-Contact Cells
All electrical contacts sit on the rear of the cell, eliminating front-side busbars for a fully black, gridline-free appearance and improved low-light response.
Genuine Bifacial Gain
The transparent rear glass lets the cells capture reflected light from the installation surface, adding extra energy yield beyond the front-side rating alone.
N-type TaiRay Wafer
Uses LONGi's advanced N-type TaiRay silicon wafer, which underpins the panel's high efficiency and long-term reliability.
Dual Glass Durability
A 2.0 mm tempered front / 2.0 mm semi-tempered rear glass sandwich improves mechanical strength, weather resistance, and long-term degradation performance versus a standard backsheet design.
Half-Cell Configuration
120 half-cut cells lower internal resistive losses and reduce the impact of partial shading and hotspots on overall output.
High Mechanical Loading
Rated to 5400 Pa front / 2400 Pa rear static loading and tested against 25 mm hailstone impact at 23 m/s, suitable for demanding wind and snow-load sites.
Technical Specifications
| Electrical Characteristics (STC) |
| Model |
LR7-60HVD-535M |
| Maximum power (Pmax) |
535 W |
| Open-circuit voltage (Voc) |
45.05 V |
| Short-circuit current (Isc) |
15.00 A |
| Voltage at Pmax (Vmp) |
37.27 V |
| Current at Pmax (Imp) |
14.36 A |
| Module efficiency |
23.7% |
| Power output tolerance |
0 to +3% |
| Electrical Characteristics (NOCT) |
| Maximum power (Pmax) |
407 W |
| Open-circuit voltage (Voc) |
42.82 V |
| Short-circuit current (Isc) |
12.05 A |
| Voltage at Pmax (Vmp) |
35.41 V |
| Current at Pmax (Imp) |
11.50 A |
| Test conditions |
AM1.5, 800 W/m², 20°C ambient, 1 m/s wind |
| Cell & Module Technology |
| Cell type |
Monocrystalline HPBC 2.0 back-contact, N-type TaiRay wafer |
| Cell configuration |
120 half-cut cells (6×20) |
| Bifacial design |
Yes — dual glass, transparent rear |
| Nominal Operating Cell Temperature (NOCT) |
45±2°C |
| Temperature Coefficients |
| Temperature coefficient of Pmax |
-0.260%/°C |
| Temperature coefficient of Voc |
-0.200%/°C |
| Temperature coefficient of Isc |
+0.050%/°C |
| Operating temperature range |
-40°C to +85°C |
| System Ratings |
| Maximum system voltage |
1500 V DC (IEC) |
| Maximum series fuse rating |
30 A |
| Protection class |
Class II |
| Fire rating |
Class A (tested) |
| Mechanical Specification |
| Dimensions (L × W × T) |
1990 × 1134 × 30 mm |
| Weight |
28 kg |
| Glass |
2.0 mm coated tempered front glass + 2.0 mm semi-tempered rear glass |
| Frame |
Anodised black aluminium alloy |
| Junction box |
IP68-rated, three bypass diodes |
| Output cable |
4 mm², +400/−200 mm (custom lengths to ±1400 mm available) |
| Front-side max static load |
5400 Pa |
| Rear-side max static load |
2400 Pa |
| Hailstone test |
25 mm hailstone at 23 m/s |
| Certification & Warranty |
| Certifications |
IEC 61215, IEC 61730, IEC 62941, ISO 9001:2015, ISO 14001:2015, ISO 45001:2018 |
| Materials & workmanship warranty |
25 years (UK & Ireland market) |
| Linear power output warranty |
30 years — 88.85% of rated power retained at year 30 |
Please Note: Rear-side power output is highly dependent on installation conditions (mounting height, tilt, and surface albedo beneath the array). The NOCT and STC figures in the specification table reflect front-side performance under standard test conditions; LONGi does not publish a fixed bifaciality percentage on this datasheet, so no bifacial gain figure is quoted here to avoid overstating expected yield.
Power Class Variants — LR7-60HVD Series
| Model |
Pmax (STC) |
Voc (V) |
Isc (A) |
Vmp (V) |
Imp (A) |
Efficiency |
| LR7-60HVD-530M |
530 W |
44.95 |
14.90 |
37.17 |
14.26 |
23.5% |
| LR7-60HVD-535M |
535 W |
45.05 |
15.00 |
37.27 |
14.36 |
23.7% |
| LR7-60HVD-540M |
540 W |
45.15 |
15.10 |
37.37 |
14.45 |
23.9% |
| LR7-60HVD-545M |
545 W |
45.25 |
15.20 |
37.47 |
14.55 |
24.2% |
| LR7-60HVD-550M |
550 W |
45.35 |
15.30 |
37.57 |
14.64 |
24.4% |
| LR7-60HVD-555M |
555 W |
45.45 |
15.40 |
37.67 |
14.73 |
24.6% |
Frequently Asked Questions
What makes HPBC 2.0 different from standard PERC or TOPCon panels?▾
HPBC 2.0 (Hybrid Passivated Back Contact) moves all electrical contacts to the rear of the cell. With no busbars on the front, more of the cell surface is available to absorb light, which improves low-light and high-temperature performance while giving a completely uniform black appearance — unlike PERC or TOPCon panels, which retain visible front-side gridlines.
How much extra energy can I expect from the bifacial design?▾
Bifacial gain depends heavily on installation conditions — mounting height, tilt angle, and the albedo (reflectivity) of the surface beneath the panel. Light-coloured roofing, gravel, or white membrane roofs reflect more light to the rear cells than dark tile or grass, so actual gain will vary by site rather than following a single fixed figure.
Can this panel be used on a standard pitched residential roof?▾
Yes. While bifacial panels are most commonly associated with ground-mount or elevated commercial arrays, the LR7-60HVD-535M is fully suited to residential rooftops. The rear-side gain will typically be more modest on close-mounted roof installations than on elevated or ground-mounted systems, but the panel still benefits from the HPBC 2.0 front-side efficiency gains regardless of mounting method.
What warranty applies to this panel in the UK?▾
LONGi provides a 25-year materials and workmanship warranty specifically for the UK and Irish market, alongside the standard 30-year linear power output warranty, under which the panel is guaranteed to retain at least 88.85% of its rated power at year 30.
Do I need special mounting hardware for the dual glass design?▾
The panel is compatible with standard PV mounting rail and clamp systems sized for its 30 mm frame profile. LONGi notes the frame design also supports short frame clamp mounting for higher mechanical loading applications — always confirm clamp positioning and torque settings against LONGi's installation manual.
