Strong in heat, no clear weak spot
The Longi Solar Hi-MO 9 LR7-72HYD 625-660M series was designed to maximize yield in PV farms, where power density per hectare and stable performance under real-world conditions are key. Its core feature is the HPBC 2.0 back-contact cells - without front busbars for collecting current, more light reaches the silicon directly, and the module looks aesthetically pleasing while delivering higher performance even under weaker sunlight.
In practice, the biggest advantage of the Hi-MO 9 is higher tolerance to partial shading losses. The current flow architecture in BC, combined with an integrated shading management approach, helps minimize production drops and the risk of localized overheating, which is crucial for installations with uneven irradiance, dirt accumulation, or periodic shading.
Additionally, the use of 0BB and advanced passivation solutions supports reliability and long-term parameter stability. This is the series for investors and EPCs who want to extract more energy from the same surface area and stand out with higher yields, rather than just the module price.
Ranking
Signals from the data
Utility-scale and shaded-installations.
Top 4% of the N-type 600-650 W segment, against a median of -0.290. Ranked 511th in the whole database.
Top 6% of the N-type 600-650 W segment, against a median of 22.77%. Ranked 517th in the whole database.
Top 7% of the N-type 600-650 W segment, against a median of 227.7. Ranked 521st in the whole database.
Back contact cells without front busbars enable a maximum efficiency of 24.4%, matching Canadian Solar TOPBiHiKu6 (24.4%) and clearly outperforming AE Solar AURORA ME-132 (21.27%) and PolyCrown Monocrystalline120 (23.32%).
STAC interconnection technology reduces power loss under single-cell shading by more than 70% compared to conventional non-BC modules, meaningfully cutting production losses in installations with uneven irradiance.
The Pmax temperature coefficient of -0.260%/°C beats typical PERC modules (around -0.35%/°C) and many TOPCon designs (around -0.29 to -0.30%/°C), translating into higher yield during high module operating temperatures.
The manufacturer guarantees less than 1% degradation in year one and a maximum of 0.35% per year thereafter, resulting in over 87.4% of nominal power after 30 years - a longer term and better end-point guarantee than the typical 25-year warranties offered by some tier-1 competitors.
LONGi Solar has operated since 2000 and holds Tier-1 bankable status, easing project financing for utility-scale PV and lowering risk for investors and EPCs compared to less-established brands in the peer set.
Bifaciality is rated at 75%±5% (up to roughly 80%), while the power- and efficiency-matched Canadian Solar TOPBiHiKu6 (bifacial TOPCon) reaches up to 85%. This is a typical trade-off of back-contact architecture - rear-side metallization limits the potential rear-side energy gain in installations on high-albedo surfaces.
- Efficiency of 23.7% is 0.9pp above the N-type 600-650W median (22.8%)
- Power density of 236.9 W/m² packs 9.2 W/m² more into the same footprint vs N-type 600-650W median (227.7 W/m²)
- Temperature coefficient of -0.26%/°C vs median -0.29%/°C means ~1% less power loss at 65°C
- At 33.5 kg, weight matches the N-type 600-650W median
- Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof
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 640 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