Middle of its segment, modest efficiency
Longi Solar Hi-MO 7 LR8-66HGD 595~665M modules are designed for maximum yield from the same installation surface - especially where every meter of construction and every logistics stage counts. The use of monocrystalline cells in a half-cell configuration, along with bifacial solutions, enables better utilization of reflected light from the ground, genuinely boosting energy production in PV farms and large commercial installations.
In practice, this series combines dual-glass construction with high environmental resilience - making it an excellent choice for projects exposed to wind, snow, humidity, and intense temperature fluctuations. The HPDC technology supports stable operation in tougher working conditions, while the declared, gradually decreasing performance degradation facilitates long-term LCOE planning.
The Hi-MO 7 LR8-66HGD is primarily intended for solar farms, C&I projects, and ground installations, where lower BOS costs, predictable yields, and module longevity are key.
Ranking
Price offers
| Shop | Country | Price | Per kWp | Stock | Offer updated | Link to shop |
|---|---|---|---|---|---|---|
| PVhurt | Poland | 477.20 zł incl. VAT | 769.68 zł/kWp | In stock | 21h ago | Visit shop |
Signals from the data
Commercial, utility-scale, cold-climate and hot-climate.
Tight roof space, roofs where every square metre has to count and hot climates.
Bottom 6% of the Back Contact 600-650 W segment, against a median of 23.70%. Ranked 1,919th in the whole database.
Bottom 6% of the Back Contact 600-650 W segment, against a median of 236.9. Ranked 2,191st in the whole database.
Bottom 15% of the Back Contact 600-650 W segment, against a median of -0.260.
Efficiency up to 23.1% places the series in the top tier of large-format module segment - for comparison, peer DAH Solar DHN-66Z16/DG reaches 23.14% at the same 625W power class, while Leapton LP182*182-M-78-NH only reaches 22.36%. HPDC technology with half-cut monocrystalline cells meaningfully increases yield per roof or ground area.
Two-sided energy generation captures light reflected from the ground, boosting output without increasing installation footprint - especially valuable for PV farms and C&I projects. The dual-glass build improves resistance to wind, snow, humidity, and temperature swings, supporting long-term stable operation in harsh site conditions.
The manufacturer declares under 1% degradation in year one, followed by a linear ~0.4% annual decline, resulting in roughly 87.4% retained power at year 30. This outperforms standard 25-year warranties with ~84.8% retention, easing long-term LCOE planning for large-scale projects.
Power output of 595-625Wp across 7 available variants means fewer modules, mounts, cables, and connection points per megawatt, meaningfully reducing Balance of System costs and installation time in large ground-mount and C&I projects.
LONGi Solar has operated since 2000 and holds Tier-1 bankable status, easing access to project financing and reducing risk for institutional investors backing this series introduced in 2023.
Back Contact cells with HPDC technology have only been in mass production since 2023, so the declared 30-year degradation profile relies mainly on accelerated lab testing and modeling rather than multi-year field data, unlike more mature PERC or TOPCon technologies.
The materials and workmanship warranty is 12 years, while a growing number of Tier-1 n-type lines introduced after 2023 (including Trina and JinkoSolar series) offer 15 years as standard - a factor worth weighing when comparing bids for large-scale installations.
- Module efficiency of 23.0% is 0.7pp below average for Back Contact 600-650W panels (median: 23.7%)
- Power density of 229.5 W/m² is 7.4 W/m² below Back Contact 600-650W median (236.9 W/m²) - needs more roof space
- Temperature coefficient of -0.28%/°C is 0.02pp worse than Back Contact 600-650W median (-0.26%/°C) - higher losses in summer heat
- 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
- In the top 14% for efficiency among all Back Contact panels
Specifications
Datasheet charts
Measured curves published by Longi Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 620 Wp appear here. The rest cover the whole series.
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.
Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here