The Longi LR8‑66HGD 615W Bifacial Solar Module is a utility‑grade, high‑performance panel engineered for maximum energy yield and long‑term reliability. Built with dual‑glass construction, half‑cut HPDC cell technology, and a bifaciality rating of 80±5%, this module is designed to deliver superior output in high‑temperature, low‑light, and reflective‑surface environments. [Longi 610w Bifacials | PDF]

With a 12‑year material and processing warranty and a 30‑year linear power output warranty, the Longi 615W LR8‑66HGD is ideal for developers, EPCs, and commercial installations seeking high yield and long‑term durability. [Longi 610w Bifacials | PDF]

Key Features

High Power Output and Conversion Efficiency

Maximum power: 615W
Module efficiency: 22.8% [Longi 610w Bifacials | PDF]
Low temperature coefficient of Pmax: ‑0.280%/°C, ensuring stronger performance in hot climates [Longi 610w Bifacials | PDF]
Rear‑side gain potential up to 25%, increasing total delivered energy depending on installation conditions [Longi 610w Bifacials | PDF]

Advanced Bifacial Dual‑Glass Design

Dual‑glass construction (2.0mm + 2.0mm) increases durability and reduces PID susceptibility [Longi 610w Bifacials | PDF]
Bifaciality rating: 80±5%, capturing additional reflected and diffuse light for higher production [Longi 610w Bifacials | PDF]
Ideal for ground‑mount systems, trackers, and high‑albedo surfaces

Industry‑Leading Durability

Mechanical load ratings:
- 5400Pa front
- 2400Pa rear [Longi 610w Bifacials | PDF]
Hail tested with 25mm hailstones at 23m/sciteturn1search1
Certified to major global standards: IEC 61215, IEC 61730, UL 61730, ISO9001, ISO14001, ISO45001, IEC62941 [Longi 610w Bifacials | PDF]

Technical Specifications

Electrical (STC) – LR8‑66HGD‑615M

Power (Pmax): 615W
Open Circuit Voltage (Voc): 48.58V
Short Circuit Current (Isc): 16.00A
Voltage at Maximum Power (Vmp): 40.71V
Current at Maximum Power (Imp): 15.11A [Longi 610w Bifacials | PDF]

Electrical (NOCT)

Pmax: 468.1W
Voc: 46.17V
Isc: 12.85A
Vmp: 38.69V
Imp: 12.10A [Longi 610w Bifacials | PDF]

Mechanical

Dimensions: 2382 × 1134 × 30 mm
Weight: 33.5 kg
Glass: Dual 2.0mm heat‑strengthened
Frame: Anodized aluminium alloy
Junction Box: IP68, three diodes
Packaging: 36 pcs per pallet / 144 pcs per 20’ GP [Longi 610w Bifacials | PDF]

Operating Conditions

Operating temperature: ‑40°C to +85°C
Maximum system voltage: 1500V DC
Maximum series fuse rating: 35A
First‑year degradation: <1%
Annual degradation (Years 2–30): 0.4% [Longi 610w Bifacials | PDF]

Applications

The Longi 615W LR8‑66HGD is suitable for:

Utility‑scale solar farms
Commercial and industrial rooftops
Solar tracking systems
Carports and agrivoltaic installations
High‑albedo and reflective installations requiring maximum bifacial gain

Why Choose the Longi LR8‑66HGD 615W?

This model combines high power output, top‑tier thermal performance, and bifacial energy gain with robust certification and long‑term durability. Its dual‑glass, half‑cut design ensures stable, efficient production in harsh climates and demanding industrial environments.

Specifications Document

Longi | Haultron Energy