SOLAR PANEL DATASHEET | HI-MO X10 SCIENTIST
LONGi HPBC 665W Solar Panel
LR8-66HVD Series (640W–665W) – N-TaiRay + HPBC 2.0 + 0BB Module for Aesthetic-Sensitive & High-Reliability Projects
The LONGi HPBC 665W solar panel (model LR8-66HVD, Hi-MO X10 Scientist series) is the next generation of LONGi's back-contact module lineup, built on N-TaiRay wafer material and HPBC 2.0 cell technology with a 0BB (zero busbar) interconnection. Rated up to 24.62% module efficiency and 665W peak power, it delivers a fully gridline-free front surface, A+ anti-shading performance, and improved resistance to micro-cracks and localized overheating - making it a strong fit for architecturally visible commercial installations as well as high-reliability distribution projects.
|
Series |
Model |
Power Range |
Max Efficiency |
|
Hi-MO X10 Scientist |
LR8-66HVD |
640W – 665W |
24.62% |
Key Features of the LONGi HPBC 665W Solar Panel
The LR8-66HVD series pairs LONGi's N-TaiRay wafer material with second-generation HPBC (Hybrid Passivated Back Contact) cell technology and a 0BB interconnection design - a step forward from the standard BC-cell platform, purpose-built for higher power density and a cleaner front-of-module appearance.
1. Advanced Cell Technology – N-TaiRay + HPBC 2.0 + 0BB
HPBC 2.0 combines an upgraded passivation structure with a zero-busbar (0BB) interconnection, reducing resistive losses and improving light capture across the cell surface. Together with N-TaiRay wafer material, this platform pushes module efficiency up to 24.62%, ahead of the standard BC-cell generation.
2. Value-Added Output – Power Leads by 30W+, A+ Anti-Shading
The LR8-66HVD delivers over 30W higher peak power than comparable conventional modules at the same footprint, and carries an A+ anti-shading rating - meaning the panel sustains higher output when part of the array is shaded by chimneys, parapets, nearby structures, or adjacent rows, a common real-world condition on commercial rooftops.
3. Aesthetic Design – No Frontal Gridlines, Scenario Integration
Because HPBC cells route all conductors to the rear of the cell, the front surface has no visible gridlines, giving the module a uniform, all-black appearance. This makes the LR8-66HVD well suited to projects where visual integration matters - building facades, carports, and rooftops visible from street level or from within the facility.
4. Enhanced Safety – Prevent Localized Overheating, Less Micro-Crack
The 0BB design distributes current across more contact points, which lowers the risk of localized hotspots from cell defects or partial shading. Combined with a more evenly stressed cell structure, this reduces the likelihood of micro-cracks during transport, installation, and long-term thermal cycling.
|
Max Efficiency |
Power Tolerance |
Year-1 Degradation |
Annual Degradation (Y2-30) |
Power Warranty |
|
24.62% |
0 ~ 3% |
< 1% |
0.35% / year |
30 years (linear) |
30-Year Linear Power Warranty
LONGi backs the LR8-66HVD series with a 15-year warranty on materials and workmanship, plus a 30-year linear power output warranty, matching the warranty terms of the wider Hi-MO X10 Scientist lineup.
|
Warranty Milestone |
Year 10 |
Year 20 |
Year 30 |
|
Minimum Guaranteed Power |
95.85% |
92.35% |
88.85% |
Electrical Characteristics – STC
Tested at Standard Test Conditions (STC): irradiance 1000W/m², cell temperature 25℃, AM1.5G spectrum. Power measurement tolerance: ±3%. The 665W variant (highlighted below) is the flagship rating referenced in this page's title.
|
Module Type |
Pmax (W) |
Voc (V) |
Isc (A) |
Vmp (V) |
Imp (A) |
Efficiency |
|
LR8-66HVD-640M |
640 |
49.52 |
16.38 |
40.78 |
15.69 |
23.69% |
|
LR8-66HVD-645M |
645 |
49.62 |
16.46 |
40.88 |
15.78 |
23.88% |
|
LR8-66HVD-650M |
650 |
49.72 |
16.54 |
40.98 |
15.86 |
24.06% |
|
LR8-66HVD-655M |
655 |
49.82 |
16.62 |
41.08 |
15.94 |
24.25% |
|
LR8-66HVD-660M |
660 |
49.92 |
16.70 |
41.18 |
16.03 |
24.43% |
|
LR8-66HVD-665M (Flagship) |
665 |
50.02 |
16.78 |
41.28 |
16.11 |
24.62% |
Rear-Side Power Gain (Bifacial Reference, Based on 645W)
As a bifacial-capable module, actual output can increase with rear-side irradiance gain depending on installation height, albedo, and racking configuration.
|
Pmax Gain |
Pmax (W) |
Voc (V) |
Isc (A) |
Vmp (V) |
Imp (A) |
|
+5% |
677 |
49.62 |
17.28 |
40.88 |
16.57 |
|
+10% |
710 |
49.62 |
18.11 |
40.88 |
17.36 |
|
+15% |
744 |
49.72 |
18.93 |
40.98 |
18.15 |
|
+20% |
776 |
49.72 |
19.75 |
40.98 |
18.94 |
|
+25% |
808 |
49.72 |
20.58 |
40.98 |
19.73 |
Mechanical Parameters
Despite a lower cell count than the LR7-72HVD series, the LR8-66HVD uses larger-format HPBC cells and shares the same external footprint - allowing it to drop into the same racking and layout plans.
|
Parameter |
Specification |
|
Cell Orientation |
132 cells (6 × 22) |
|
Junction Box |
IP68, three diodes |
|
Output Cable |
4mm², +400/-200mm (customizable up to ±1400mm) |
|
Glass |
Dual glass, 2.0 + 2.0mm semi-tempered |
|
Frame |
Anodized aluminum alloy |
|
Weight |
33.5 kg |
|
Dimensions |
2382 × 1134 × 30 mm |
|
Packaging |
36 pcs/pallet · 144 pcs/20' GP container · 720 pcs/40' HC container |
Operating Parameters & Mechanical Loading
|
Operating Parameter |
Value |
Mechanical Loading |
Value |
|
Operating Temperature |
-40℃ to +85℃ |
Front Side Max. Static Load |
5400 Pa |
|
Power Output Tolerance |
0 ~ 3% |
Rear Side Max. Static Load |
2400 Pa |
|
Maximum System Voltage |
DC 1500V (IEC) |
Hailstone Test |
25mm @ 23 m/s |
|
Maximum Series Fuse Rating |
35 A |
Protection Class |
Class II |
|
Nominal Operating Cell Temp. |
45 ± 2℃ |
Bifaciality |
75 ± 5% |
|
Fire Rating |
IEC Class C |
Temperature Coefficients (STC)
|
Coefficient |
Value |
|
Temperature Coefficient of Isc |
+0.050%/℃ |
|
Temperature Coefficient of Voc |
-0.200%/℃ |
|
Temperature Coefficient of Pmax |
-0.260%/℃ |
Certifications
IEC 61215, IEC 61730 – Design qualification and safety certification for PV modules
ISO 9001:2015 – Quality Management System
ISO 14001:2015 – Environmental Management System
ISO 45001:2018 – Occupational Health & Safety Management System
IEC 62941 – Guideline for module design qualification and type approval
Recommended Applications
Architecturally Visible Commercial Sites
Carports, canopies, facades, and street-facing rooftops where the gridline-free, uniform-black front surface improves the finished appearance of the installation.
Partially Shaded Commercial Rooftops
Sites with chimneys, HVAC units, parapets, or adjacent rows casting periodic shade benefit from the panel's A+ anti-shading rating, which limits output loss from partial coverage.
High-Reliability, Long-Duty-Cycle Installations
Projects where long-term hotspot and micro-crack resistance matter - such as large commercial and industrial portfolios with long O&M horizons - benefit from the 0BB design's more even current distribution.
LR8-66HVD (HPBC 2.0) vs. LR7-72HVD (BC-Cell)
Both series sit within LONGi's Hi-MO X10 Scientist line and share the same 640–665W power range, external dimensions, and warranty terms - but differ in cell technology, electrical ratings, and ideal use case. Use the table below to match the right module to a project's priorities.
|
Attribute |
LR8-66HVD (HPBC 2.0 – this page) |
LR7-72HVD (BC-Cell) |
|
Cell Technology |
N-TaiRay + HPBC 2.0 + 0BB |
TaiRay wafer + BC-Cell |
|
Cell Layout |
132 cells (6 × 22) |
144 cells (6 × 24) |
|
Power Range |
640W – 665W |
640W – 665W |
|
Max Module Efficiency |
24.62% |
24.6% |
|
Power Tolerance |
0 ~ 3% |
0 ~ 3% |
|
Year-1 / Annual Degradation |
< 1% / 0.35% per year |
< 1% / 0.35% per year |
|
Max Series Fuse Rating |
35 A |
30 A |
|
Bifaciality |
75 ± 5% |
70 ± 5% |
|
Fire Rating |
IEC Class C |
UL Type 29 / IEC Class C |
|
Front-Side Aesthetic |
No frontal gridlines, uniform all-black finish |
Standard BC front surface |
|
Shading Tolerance |
A+ anti-shading performance |
Standard |
|
Micro-Crack / Hotspot Resistance |
0BB design reduces micro-cracks and localized overheating |
Standard BC reliability |
|
Weight / Dimensions |
33.5 kg / 2382 × 1134 × 30 mm |
33.5 kg / 2382 × 1134 × 30 mm |
|
Warranty |
15-year product / 30-year linear power |
15-year product / 30-year linear power |
|
Best Fit |
Aesthetic-sensitive, partial-shading, and visible commercial/architectural sites |
General-purpose distribution and commercial rooftops |
In short: choose the LR8-66HVD (HPBC 2.0) where front-of-module appearance, partial-shading tolerance, or added hotspot/micro-crack resistance are priorities. Choose the LR7-72HVD (BC-Cell) for general-purpose commercial and distribution projects where standard BC performance and a slightly higher fuse headroom margin are sufficient.
FAQ
Q: What does HPBC 2.0 mean on the LONGi 665W panel?
A: HPBC stands for Hybrid Passivated Back Contact - a cell architecture that moves all electrical contacts to the rear of the cell. Version 2.0 adds an upgraded passivation layer and a 0BB (zero busbar) interconnection for lower resistive loss and higher efficiency.
Q: What is 0BB and why does it matter?
A: 0BB removes traditional busbars from the cell surface, replacing them with a distributed contact scheme. This reduces shading loss on the cell itself and spreads current across more contact points, lowering the risk of localized overheating and micro-cracks.
Q: How does the LR8-66HVD differ from the LR7-72HVD?
A: Both are BC-family modules in the Hi-MO X10 Scientist series with the same power range and footprint, but the LR8-66HVD uses HPBC 2.0 with 0BB technology, reaches slightly higher efficiency (24.62% vs 24.6%), and adds A+ anti-shading performance and a fully gridline-free front surface. See the comparison table above for full details.
Q: Is the LONGi HPBC 665W panel suitable for partially shaded roofs?
A: Yes. Its A+ anti-shading rating is specifically designed to reduce power loss when part of the array is shaded by obstructions such as vents, parapets, or nearby structures.
Q: What warranty does the LR8-66HVD carry?
A: It carries a 15-year warranty on materials and workmanship, plus a 30-year linear power output warranty, guaranteeing at least 88.85% of rated power at year 30.
Q: How many panels fit in a shipping container?
A: Standard packaging is 36 panels per pallet, approximately 144 panels per 20' GP container, and approximately 720 panels per 40' HC container - identical to the LR7-72HVD series.
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