LONGi Hi-MO X10 Scientist LR7-72HVD-640M 640Wp bifacial – pallet of 36 modules (23.04kWp)Pallet of 36 bifacial dual-glass HPBC 2.0 modules, 640Wp each

Overview

This pallet carries 36 LONGi LR7-72HVD-640M dual-glass bifacial modules, 23.04kWp of front-side power. Each module gives 640Wp at 23.69% efficiency, 54.02V Voc and 14.98A Isc, and adds rear-side yield with a bifaciality of 70±5%: LONGi quotes 721W at 10% rear gain for the 655W model. With 2.0+2.0mm glass, 32.5kg weight and a 30A fuse rating, it fits elevated commercial roofs, carports and ground mounts over bright surfaces where the rear face receives reflected light.

• HPBC 2.0 back-contact cells on n-type TaiRay wafers
• No front gridlines, module efficiency up to 24.82%
• Pmax temperature coefficient -0.26%/°C
• 15-year product and 30-year power warranty
• 36 modules per pallet, 720 or 792 per 40ft container

How the Hi-MO X10 works

Hi-MO X10 is LONGi's distributed-generation range built on HPBC 2.0 cells, a hybrid passivated back-contact design on n-type TaiRay wafers. Both polarities are contacted on the rear of the cell, so the front surface has no busbars or gridlines and more of the glass area collects light. LONGi rates the Scientist versions at up to 24.80% (72-cell) and 24.82% (60-cell) module efficiency.

LONGi also designs the cell layout to limit losses under partial shading and states, from IEC 61215 hot-spot testing, that shaded cells run markedly cooler than in conventional modules. The temperature coefficient of Pmax is -0.26%/°C and the Voc coefficient -0.20%/°C, which helps on hot roofs.

Versions offered in pallets

LR7-60HVH is the compact monofacial version: 120 half cells, 1,990×1,134×30mm, 24.5kg, 535–560W. LR7-72HVH uses 144 half cells in a 2,382×1,134×30mm format at 28.5kg and 640–670W, with 3.2mm coated tempered glass. LR7-72HVD has the same footprint in a dual-glass build (2.0+2.0mm semi-tempered), weighs 32.5kg and has a bifaciality of 70±5%.

All three are rated for 1500V DC systems, use an IP68 junction box with three bypass diodes and 4mm² output cables, and carry an anodised aluminium frame 30mm deep. A full pallet holds 36 modules; a 40ft high-cube container takes 720 of the 72-cell or 792 of the 60-cell modules.

Installation notes from the manual

LONGi requires at least 10cm between frame and roof surface when modules run parallel to the roof, at least 10mm between adjacent modules for thermal expansion, and the same orientation and tilt for all modules of a string. Modules can be installed in portrait or landscape orientation without blocking the drain holes, and the manual lists permitted bolt and clamp zones for each model with the matching test loads.

Modules with different electrical ratings must not share a string, and connectors of different brands or models must not be mated. Where more than two strings run in parallel, each string needs its own overcurrent protection. String length is calculated from Voc at the lowest expected site temperature, using the datasheet coefficient.

Handling and storage

Keep pallets in their original packaging in a dry, ventilated place until installation; for outdoor storage the packs must be covered against rain and kept off wet ground. Never lift a module by its junction box or cables, do not stand on modules, and use two people to carry them. LONGi does not allow drilling the frame, which voids the limited warranty.

Questions and answers