Longi LR8-66HGD-620M White, Hi-MO 7, Bifacial

Tiered Pricing available this Price is for 1 to 35 units

The Longi LR8-66HGD-620M White (part of the Hi-MO 7 series) is a high-power bifacial dual-glass solar module designed primarily for commercial, industrial, and utility-scale installations. It uses advanced HPDC (likely a high-performance dual-cell or similar n-type TOPCon-based) cell technology with 132 half-cut cells (6×22 configuration). The "White" designation refers to the white backsheet/glass appearance in the bifacial setup, paired with a silver anodized aluminum frame for a classic/neutral look (as opposed to all-black variants).

Key Specifications (at STC for the 620W variant)

Maximum Power (Pmax): 620 Wp (power tolerance 0~+3%)
Module Efficiency: 23.0%
Dimensions: 2382 × 1134 × 30 mm
Weight: 33.5 kg
Cell Type: 132 half-cut HPDC bifacial cells (n-type/TOPCon-based)
Bifaciality: 80 ±5% (rear-side power generation relative to front)
Temperature Coefficients:
- Pmax: -0.280%/°C
- Voc: -0.230%/°C
- Isc: +0.045%/°C
STC Electrical Data (approx.): Voc 48.78 V, Isc 16.05 A, Vmp 40.91 V, Imp 15.16 A
NOCT Performance: ~471.9 W (realistic operating conditions)
Mechanical Loading: 5400 Pa front / 2400 Pa rear; hail resistance (25 mm at 23 m/s)
Operating Temperature: -40°C to +85°C
System Voltage: Up to 1500 V DC
Junction Box: IP68 with 3 diodes
Construction: Dual 2.0 mm heat-strengthened glass, anodized aluminum frame

Warranties:

12 years on materials and processing
30 years linear power output: <1% degradation in year 1, then 0.4% per year thereafter (guarantees strong long-term retention, e.g., around 87-88% at year 30 depending on exact curve)

Performance and FeaturesThis panel emphasizes high energy yield through:

Excellent bifacial gain (up to ~80% rear-side contribution, potentially adding 10-30% extra output depending on albedo/ground reflectivity, mounting height, and site conditions like snow, sand, or white surfaces).
Superior temperature coefficient (-0.28%/°C), which helps maintain output better in hot climates compared to many older PERC modules.
Half-cut cell design for lower operating temperatures and reduced resistive losses.
Good low-light and high-temperature performance, making it suitable for varied environments.

Longi claims up to 3% higher power generation versus mainstream bifacial modules due to the combination of high bifaciality and the temperature coefficient. The ~4.5% power uplift in the Hi-MO 7 series also helps reduce balance-of-system (BOS) costs (fewer panels, less racking/inverter/cabling needs for the same capacity).DATA SHEET