Longi Hi-MO X10 Anti-Dust 645W Solar Panel (LR8-66HVDF-645M)

The LONGi LR8-66HVDF-645M is a 645W Hi-MO X10 Anti-Dust module with back-contact (BC) cells, dual glass and 23.88% module efficiency.

LONGi's patented frame design reduces dust build-up along the lower edge of the module, cutting cleaning and the yield loss that dust causes over the module's life. The back-contact cells have no front busbars, run cooler under partial shade and protect against hotspots. Power degradation is 1% in year one and 0.35% a year from years 2 to 30, backed by a 30-year power warranty and a 15-year product warranty.

The 2.0 mm + 2.0 mm semi-tempered dual-glass build in an anodised aluminium frame is rated to 5400 Pa front and 2400 Pa rear static load and hail-tested with 25 mm hailstones at 23 m/s. It is bifacial, so the rear face adds yield on light-coloured or cement roofs and carport structures.

Why installers choose it

• 645W at 23.88% efficiency in the 2382 x 1134 mm 132-cell format
• Anti-dust frame: less soiling and cleaning on low-tilt and dusty sites
• Back-contact (BC) cells: -0.26%/°C Pmax temperature coefficient and better shading behaviour
• Bifacial dual-glass: up to 808 W total with 25% rear-side gain (datasheet table)
• 15-year product and 30-year power warranty: 1% in year 1, then 0.35% a year
• 1500 V DC system voltage (IEC), 35 A maximum series fuse
• IEC 61215 and IEC 61730 certified

Good to know before you quote it

• Large format: 2382 x 1134 x 30 mm, 32.5 kg. Check rail spans and clamp zones for 2.4 m modules.
• Voc 49.62 V and Isc 16.46 A at STC. Maximum series fuse rating is 35 A. Size strings for the coldest site temperature (Voc coefficient -0.200%/°C).
• Connector: Stäubli EVO2A or LONGi PV-LR5, depending on batch. Confirm on delivered stock before mixing with other brands.
• Packed 35 modules per pallet (not 36). Cables are +400/-200 mm for portrait or ±1400 mm for landscape mounting (customisable).