Longi 615W Bifacial Silver Glass-Glass Photovoltaic Panel

LONGi 615W Bifacial Silver (LR8-66HGD-615M) is a modern, bifacial photovoltaic module from the Hi-MO 7 series, designed for commercial, industrial and farm installations, where high specific power, efficiency and long-term operational stability are of key importance.

Advanced HPDC cell technology combined with a bifacial glass-glass structure ensures high energy generation from both the front and rear sides of the module. High bifaciality (80 ± 5%) enables additional energy gain through the use of light reflected from the ground. Half-cut technology reduces resistive losses and improves module operation in partial shade.

The double glass structure (2.0 + 2.0 mm) and the anodized aluminum alloy frame guarantee high mechanical resistance (5400 Pa front / 2400 Pa rear) and durability in difficult environmental conditions. LONGi lifecycle quality ensures stable and trouble-free operation for decades.

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Key features

- Power 615 Wp
- HPDC cell technology (Hi-MO 7)
- Bifacial construction, glass-glass
- 132 half-cut cells (6×22)
- Module efficiency: 23.0%
- Bifaciality coefficient: 80 ±5%
- Max. degradation in 1 year: <1%
- Max degradation in years 2-30: 0.4% per year
- Tier-1 Manufacturer (BloombergNEF)
- Product warranty: 12 years
- Linear power warranty: 30 years
- Dimensions: 2382 × 1134 × 30 mm
- Weight: 33.5 kg

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Technical parameters

- Model: LR8-66HGD-615M
- Rated power (STC): 620 W
- Module type: monocrystalline, bifacial, glass-glass
- Cell configuration: 132 half-cut
- Glass: double 2.0 + 2.0 mm, heat-strengthened
- Junction box: IP68, three diodes
- Frame: anodized aluminum alloy
- Output cables: 4 mm² (+400 / –200 mm, adjustable)
- Connectors: MC4-compatible
- Maximum system voltage: 1500 V DC
- Maximum value of the safety insert: 35 A
- Protection class: Class II
- Fire rating: UL Type 29 / IEC Class C

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Electrical specification (STC)

- Maximum power (Pmax): 615 W
- Open circuit voltage (Voc): approx. 48.78 V
- Short-circuit current (Isc): approx. 16.05 A
- Voltage at maximum power (Vmp): approx. 40.91 V
- Current at maximum power (Imp): approx. 15.16 A
- Module efficiency: 23.0%
- Power tolerance: 0 ~ +3%

STC conditions: AM1.5, 1000 W/m², 25°C

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Temperature parameters

- Temperature coefficient Isc: +0.045% / °C
- Temperature coefficient Voc: –0.230 % / °C
- Temperature coefficient Pmax: –0.280% / °C
- Operating temperature: –40°C ~ +85°C
- Cell temperature under normal conditions (NOCT): 45 ± 2°C

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Mechanical loads

- Maximum front static load: 5400 Pa
- Maximum rear static load: 2400 Pa
- Hail ball test: 25 mm at a speed of 23 m/s

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Compatibility

- string inverters (high voltage)
- central inverters
- on-grid installations
- off-grid installations
- hybrid systems
- photovoltaic farms and terrestrial projects
- energy storage installations

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The most important parameters – why it is worth it

- 620 W = high unit power and fewer modules in the design
- HPDC technology = high efficiency and stable energy production
- Bifacial 80% = additional yield on the back side
- 1500 V DC = possibility of building longer strings and reducing BOS costs
- Glass-glass construction = increased durability and environmental resistance
- 30 years of linear warranty = long-term investment security