Strong in heat, no clear weak spot
The Longi Solar Hi-MO 5m series was designed specifically for rooftop installations, where easy mounting, predictable performance, and high yield in real-world conditions are essential. The use of half-cell monocrystalline PERC solar cells helps reduce losses and stabilize module performance, especially when part of the area is less well-lit. A key feature is doping with gallium (anti-LID), which reduces the early degradation effect and supports maintaining power over a long period - a concrete benefit for investors focusing on production energy returns, not just initial parameters.
The Hi-MO 5m also utilizes Smart Soldering, meaning precise cell connections, which improves connection reliability and supports module operation under load. Additionally, optimized electrical parameters facilitate compatibility with popular string inverters, reducing the risk of losses and simplifying the design process. This is an excellent choice for residential, small, and medium-sized businesses, as well as C&I rooftops, where competition often requires compromises between dimensions, compatibility, and longevity.
Ranking
Signals from the data
Residential, commercial and shaded-installations.
Top 15% of the PERC 350-400 W segment, against a median of -0.350.
LONGi holds BNEF Tier 1 status (Q2 2026) and an AAA rating in PV Tech's bankability ranking for 25 consecutive quarters. This provides real risk mitigation for investors and lenders financing PV projects.
Replacing boron with gallium as the p-type dopant in the PERC cells eliminates the typical 1-2% first-year Light-Induced Degradation (LID) loss seen in conventional boron-doped modules, translating into higher real-world energy yield from day one.
Splitting cells into halves reduces resistive losses and improves partial-shading tolerance, while the Smart Soldering precision-bonding process improves interconnect reliability under mechanical and thermal stress.
Optimized electrical parameters simplify pairing with mainstream string inverters without oversizing the array, lowering BoS costs and simplifying the electrical design.
The Hi-MO 5m series has been phased out (produced 2022-2024), meaning limited availability of identical modules for system extensions and potentially longer lead times for warranty claims fulfilled with replacement stock.
The 21.5% peak efficiency lags newer designs such as Q-SUN Qrystal N10 (22.7%, N-type technology) at the same 505 Wp power class - a roughly 5.6% relative gap, meaning lower yield per m² on space-constrained roofs.
The absence of a bifacial variant limits additional albedo-driven yield, which matters for ground-mount arrays or reflective C&I roofs where competing series offer double-sided options.
The standard 12-year product warranty is shorter than the 15-25 years now offered by many Tier-1 manufacturers on newer N-type series, which can affect comparability in long-term TCO calculations.
- At 20.2% efficiency, this panel is 0.8pp above typical PERC 0-400W modules (median: 19.4%)
- 202.3 W/m² power density - 7.9 W/m² more than PERC 0-400W median (194.4 W/m²), more power per roof area
- Temperature coefficient of -0.34%/°C matches the PERC 0-400W median
- Weight of 21.5 kg is typical for PERC 0-400W panels
- #11956 for efficiency, #8778 for temperature performance out of 14005 panels
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
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