- 24.6% module efficiency - 1.3pp better than the N-type 650-700W median of 23.3%
- 246.2 W/m² power density - 13.7 W/m² more than N-type 650-700W median (232.5 W/m²), more power per roof area
- Temperature coefficient of -0.26%/°C vs median -0.29%/°C means ~1% less power loss at 65°C
- Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface
- Ranked #36 out of 11672 panels for efficiency in the database
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Series Hi-MO X10 Guardian (LR7-72HVDF 640~665M) 6 variants
The Longi Solar Hi-MO X10 Guardian (LR7-72HVDF 640-665M) series is engineered to maintain high performance where other modules typically lose efficiency – in dusty conditions, seasonal shading, and at risk of hotspots. The key difference is the anti-dust frame design, which minimizes dirt accumulation on the glass edges, thereby reducing performance degradation over time and decreasing the need for cleaning. In practice, this ensures more reliable operation during dry seasons, on sites near roads, industrial facilities, or in polluted areas.
The modules feature back-contact architecture, which enhances light capture on the front side of the cells and supports energy yield even under challenging exposure conditions. Additionally, the series emphasizes shade resistance – experiencing fewer losses from shading caused by chimneys, skylights, obstacles, and pollution. Another important feature is reduced localized heating, increasing long-term safety and operational predictability. This makes it an excellent choice for large-scale PV farms and commercial & industrial (C&I) rooftops, where high performance, serviceability, and lower energy costs over the lifetime are key priorities.
Electrical Parameters (STC)
| Nominal Power (Pmax) | 665 Wp |
| Module Efficiency | 24.60% |
| Voltage at Max Power (Vmpp) | 45.17 V |
| Current at Max Power (Impp) | 14.72 A |
| Open Circuit Voltage (Voc) | 54.52 V |
| Short Circuit Current (Isc) | 15.35 A |
| Max System Voltage | 1500 V |
Temperature Coefficients
| Temp. Coeff. Pmax | -0.260%/°C |
| Temp. Coeff. Voc | -0.200%/°C |
| Temp. Coeff. Isc | 0.050%/°C |
| NOCT | 45°C |
Cell Technology
| Cell Type | Monocrystalline |
| Cell Count | 144 |
| Bifacial | Yes |
| Bifaciality Factor | 70% |
Dimensions & Weight
| Length | 2382 mm |
| Width | 1134 mm |
| Height | 30 mm |
| Weight | 33.5 kg |
| Area | 2.70 m² |
| Power Density | 246.2 Wp/m² |
Warranty
| Product Warranty | 15 years |
| Performance Warranty | 30 years |
| End-of-Warranty Output | 88.8% |
| First Year Degradation | 1.00% |
| Annual Degradation | 0.35%/year |