LONGi 665W Solar Panel
LR7-72HVD Series (640W–665W) – BC-Cell Mono Module for Commercial & Industrial Rooftops
The LONGi 650W solar panel (model LR7-72HVD, Hi-MO X10 Scientist series) is a high-efficiency BC-cell (back-contact) monocrystalline module engineered for the global distribution market. Rated at up to 24.6% module efficiency with an output range of 640W to 665W, this panel is purpose-built for commercial and industrial cement rooftops and high-temperature installation environments, delivering strong peak power performance backed by a 30-year linear power warranty.
|
Series |
Model |
Power Range |
Max Efficiency |
|
Hi-MO X10 Scientist |
LR7-72HVD |
640W – 665W |
24.6% |
Key Features of the LONGi 650W Solar Panel
The LR7-72HVD series brings together LONGi's TaiRay wafer material and BC (back-contact) cell technology to deliver a solar panel built for reliability, high yield, and long-term performance in demanding commercial environments.
1. Suitable for the Distribution Market
The LONGi 650W panel uses a standard 72-cell form factor, making it compatible with most common mounting systems and inverter models. This flexibility allows distributors and installers to deploy the same panel across a wide range of project sizes and regions, simplifying inventory and logistics planning.
2. Peak Efficiency with Top Power Generation Performance
With a module efficiency of up to 24.6%, the LONGi 650W solar panel converts more sunlight into usable electricity per square meter of roof space. For commercial and industrial buyers working with limited roof area, this translates directly into higher installed capacity and improved project returns.
3. TaiRay Wafer & BC Technology for Higher Reliability
Back-contact (BC) cell architecture removes front-side gridlines that typically block sunlight and create hotspots. Combined with LONGi's TaiRay wafer material system, this construction improves long-term output stability and reduces the risk of performance degradation over the panel's lifetime.
4. Optimized for Commercial Cement Roofs & High-Temperature Sites
BC-cell modules run at a lower operating temperature than conventional PERC or TOPCon panels. This characteristic makes the LONGi 650W solar panel especially well suited to commercial and industrial cement rooftops, and to installations in high-irradiance, high-ambient-temperature climates where thermal losses typically reduce annual yield.
|
Max Efficiency |
Power Tolerance |
Year-1 Degradation |
Annual Degradation (Y2-30) |
Power Warranty |
|
24.6% |
0 ~ 3% |
< 1% |
0.35% / year |
30 years (linear) |
30-Year Linear Power Warranty
LONGi backs the LR7-72HVD series with a 15-year warranty on materials and workmanship, plus a 30-year linear power output warranty - giving distributors and EPCs a predictable performance guarantee for long-term financial modeling.
|
Warranty Milestone |
Year 10 |
Year 20 |
Year 30 |
|
Minimum Guaranteed Power |
95.85% |
92.35% |
88.85% |
Electrical Characteristics – STC & NOCT
STC: irradiance 1000W/m², cell temperature 25℃, AM1.5G spectrum. NOCT: irradiance 800W/m², ambient temperature 20℃, wind speed 1m/s. Power measurement tolerance: ±3%. The 650W variant (highlighted below) is the flagship rating in this series.
|
Module Type |
Condition |
Pmax (W) |
Voc (V) |
Isc (A) |
Vmp (V) |
Imp (A) |
Efficiency |
|
LR7-72HVD-640M |
STC |
640 |
54.02 |
14.98 |
44.67 |
14.33 |
23.7% |
|
NOCT |
487 |
51.34 |
12.03 |
42.45 |
11.49 |
||
|
LR7-72HVD-645M |
STC |
645 |
54.12 |
15.06 |
44.77 |
14.41 |
23.9% |
|
NOCT |
491 |
51.43 |
12.10 |
42.55 |
11.55 |
||
|
LR7-72HVD-650M |
STC |
650 |
54.22 |
15.14 |
44.87 |
14.49 |
24.1% |
|
NOCT |
495 |
51.53 |
12.16 |
42.64 |
11.61 |
||
|
LR7-72HVD-655M |
STC |
655 |
54.32 |
15.22 |
44.97 |
14.57 |
24.2% |
|
NOCT |
499 |
51.62 |
12.22 |
42.74 |
11.68 |
||
|
LR7-72HVD-660M |
STC |
660 |
54.42 |
15.30 |
45.07 |
14.65 |
24.4% |
|
NOCT |
502 |
51.72 |
12.29 |
42.83 |
11.75 |
||
|
LR7-72HVD-665M |
STC |
665 |
54.52 |
15.35 |
45.17 |
14.72 |
24.6% |
|
NOCT |
506 |
51.81 |
12.33 |
42.93 |
11.80 |
Rear-Side Power Gain (Bifacial Reference, Based on 665W)
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% |
688 |
54.32 |
15.98 |
44.97 |
15.30 |
|
+10% |
721 |
54.32 |
16.74 |
44.97 |
16.03 |
|
+15% |
755 |
54.42 |
17.50 |
45.07 |
16.76 |
|
+20% |
788 |
54.42 |
18.26 |
45.07 |
17.48 |
|
+25% |
821 |
54.42 |
19.03 |
45.07 |
18.21 |
Mechanical Parameters
|
Parameter |
Specification |
|
Cell Orientation |
144 cells (6 × 24) |
|
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 |
30 A |
Protection Class |
Class II |
|
Nominal Operating Cell Temp. |
45 ± 2℃ |
Bifaciality |
70 ± 5% |
|
Fire Rating |
UL Type 29 / 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 45001:2018
Occupational Health & Safety Management System
IEC 62941
Guideline for module design qualification and type approval
Recommended Applications
Commercial & Industrial Rooftops
Large-span cement and metal rooftops on factories, warehouses, and distribution centers, where the BC-cell's lower operating temperature helps maintain output during peak summer loads.
Distributed Generation & Wholesale Channels
Standard dimensions and wide inverter/racking compatibility make the LONGi 650W panel an efficient SKU for distributors supplying multiple project types from a single stocked product.
High-Irradiance & High-Ambient-Temperature Regions
Low temperature coefficients and low annual degradation support stable long-term yield in hot climates and locations with large diurnal temperature swings.
Frequently Asked Questions
Q: What is the efficiency of the LONGi 650W solar panel?
A: The LR7-72HVD series reaches up to 24.6% module efficiency at its 665W rating, with the 650W variant rated at 24.1% - among the higher efficiency levels available in a standard 72-cell distribution-market panel.
Q: What warranty does the LONGi 650W panel 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: Is the LONGi 650W solar panel suitable for hot climates?
A: Yes. Its BC-cell construction runs at a lower operating temperature than conventional cell technologies, reducing thermal power loss on hot commercial and industrial rooftops.
Q: What is the maximum system voltage and fuse rating?
A: The module is rated for a maximum system voltage of DC 1500V (IEC) and a maximum series fuse rating of 30A.
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.
Q: Can the output cable length be customized?
A: Yes. The standard cable length is +400mm/-200mm, and it can be customized up to ±1400mm on request - confirm minimum order quantities for custom configurations with your sales contact.
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