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LONGi Hi‑MO X10 Scientist LR8-66HVD-640M PV Module

The LONGi Hi-MO X10 Scientist LR8-66HVD-640M is a 640W high-power dual-glass photovoltaic module designed for commercial rooftop solar, industrial distributed PV, large-format high-efficiency solar installations, and projects that want premium BC-cell performance with strong energy density. Its large 132-cell format, IP68 junction box, DC1500V design, and dual-glass structure make it well suited for demanding installations where output, reliability, and long service life are critical.

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Official data for the LR8-66HVD-640M lists 640W rated power, 23.69% module efficiency, and support for rear-side power gain values on the product page, which makes the module attractive for advanced distributed and high-output PV applications. The series also offers strong mechanical load performance, low temperature coefficients, and a 2382 mm long format that helps EPC contractors reduce module count in large-capacity projects.

For keyword coverage, this module targets phrases such as 640W solar panel, high power PV module, dual glass photovoltaic module, commercial solar panel, industrial solar module, BC-cell solar module, distributed PV panel, high efficiency LONGi solar panel, Hi-MO X10 Scientist module, and LR8-66HVD-640M. Official page: https://eu.longi.com/longi-solar-panels-datasheets/lr8-66hvd-640-665

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Technical Specifications Feedback

Item	Details
Series	LONGi LR8-66HVD 640–665M dual-glass PV module
Model	LR8-66HVD-640M
Rated power (STC)	640 W
Electrical data (STC)	Voc 49.52 V; Isc 16.38 A; Vmp 40.78 V; Imp 15.69 A
Module efficiency	23.69% (model); series max efficiency 24.62%
Cell orientation	132 (6×22)
Junction box	IP68, three diodes
Glass / frame	Dual glass, 2.0 + 2.0 mm semi-tempered glass; anodized aluminum alloy frame
Weight / dimensions	32.5 kg; 2382 × 1134 × 30 mm
Power tolerance	0–3%
Operating parameters	DC1500V (IEC), max series fuse 35 A, operating temperature -40°C to +85°C
Mechanical load	5400 Pa front / 2400 Pa rear; hail test 25 mm at 23 m/s
Temperature coefficients	Isc +0.050%/°C; Voc -0.200%/°C; Pmax -0.260%/°C
Rear-side gain	Reference on official page: electrical characteristics listed for 5% to 25% rear-side power gain