Middle of its segment, weak in heat
The HNM7-SHLDD156 series is a solar module that combines P-type monocrystalline half-cut cells with a double-glass, bifacial structure, allowing an array to recover additional energy reflected from the ground instead of losing it outright. The use of multi-busbar (MBB/10BB) technology shortens the current path to the collecting grid, translating into higher energy yield without increasing the panel footprint - a solution for installers looking to fit more power onto the same roof or ground-mount area. The panel also stands out for its PID resistance and stable performance in low-light conditions, which matters during overcast weather, haze, or early morning hours - situations where cheaper modules lose considerably more output. Tempered double glass with an anti-reflective coating ensures durability in harsh environments - salty air, humidity, high temperatures, or dust - making the series attractive for coastal, agricultural, and industrial projects. The manufacturer backs this quality with a long, linear power warranty, increasing the security of the investment and lowering the effective cost of energy over the system's full operating lifetime.
Ranking
Signals from the data
Commercial, utility-scale and shaded-installations.
Hot climates and weight-limited structures.
Bottom 11% of the 505-705 W band, against a median of -0.300.
Bottom 16% of the 505-705 W band, against a median of 52.9.
The dual-glass bifacial construction recovers additional energy reflected off the ground - the manufacturer claims up to 25% extra rear-side yield under favorable albedo conditions, a notable advantage for installations on light-colored roofs, gravel, or grass.
The 30-year power warranty exceeds the standard 25-year term offered by most Tier-1 manufacturers, improving long-term energy yield predictability and lowering the effective LCOE over the project lifetime.
The multi-busbar (10BB) grid shortens the current path to the collecting busbars, reducing resistive losses within the cell and translating into higher energy yield without increasing panel footprint - useful where roof area is limited.
Claimed PID (potential-induced degradation) resistance combined with stable low-irradiance performance limits output losses on cloudy, foggy, or early-morning days, unlike cheaper modules lacking this certification.
The 21.82% maximum efficiency places the series close to comparable PERC/older-generation N-type models, such as Techwise Solar Summit Series (21.55%) and GCL-M12/60GDF (21.6%), while reaching up to 610 Wp.
The series is built on older P-type monocrystalline cell technology, while the competing Renewsys DESERV Extreme (N-type TOPCon) reaches 23.64% efficiency - roughly 8% relatively higher than HNM7-SHLDD156's maximum 21.82%. P-type cells also typically carry higher susceptibility to LID/LeTID degradation than N-type.
Available sources found no confirmation that Hounen Solar appears on the BloombergNEF Tier 1 manufacturer list, which for some institutional investors and project-finance banks can be a limiting factor for bankability compared to established Tier-1 producers.
- At 21.6% efficiency, this panel is on par with typical database modules
- Power density of 216.4 W/m² matches the database median
- -0.35%/°C temperature coefficient - 0.05pp worse than database median (-0.30%/°C), expect higher hot weather losses
- At 34.5 kg (8.0 kg above database median of 26.5 kg), requires checking roof load capacity
- 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces
Specifications
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.
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