Light for its output, short guarantee
The Longi Solar Hi-MO 5m (G2) series was designed with rooftop installations in mind, where high energy yield, aesthetics, and hassle-free installation are equally important. These modules are based on monocrystalline PERC solar cells doped with gallium, effectively reducing light-induced degradation (LID) and helping maintain stable performance over the long term. In practice, this means less disappointment in subsequent seasons and more predictable savings.
What stands out in this series is Smart Soldering - segmented soldering tapes, which better manages stresses in the cells and improves reliability during daily temperature fluctuations. Additionally, optimized electrical parameters simplify equipment selection-modules work well with popular inverters and MLPE devices (e.g., optimizers, string inverters).
The Hi-MO 5m (G2) is a good choice for homes, micro-installations, and smaller C&I roofs, especially when a compact format and aesthetic appearance (including all-black variants) are important, while simultaneously expecting high performance in weaker morning, evening, and less-than-ideal light incidence angles.
Ranking
Signals from the data
Residential, commercial and shaded-installations.
Owners who want a long output guarantee.
Top 23% of the PERC 550-600 W segment, against a median of 52.7.
Bottom 24% of the PERC 550-600 W segment, against a median of 27 yrs.
Gallium-doped PERC cells limit LID to below 1.5% in the first year, with only 0.4% annual degradation thereafter, translating to roughly 88% of nominal power retained after 25 years of operation.
Longi Solar has operated since 2000 and is classified as bankable Tier-1, easing project financing and increasing confidence in long-term warranty support compared to less established brands.
Maximum efficiency of 21.9% ties the top comparable module, JA Solar DeepBlue 3.0 Pro (21.9%), and exceeds Vikram Solar PREXOS and Paradea (21.87%), despite relying on proven PERC rather than pricier N-type cells.
Smart Soldering technology reduces mechanical stress on cells during thermal cycling, lowering the risk of microcracks and power loss over the module's operating life — relevant in climates with large seasonal temperature swings.
12 variants spanning 405-565 Wp, plus available all-black versions, allow the module to fit both small pitched residential roofs and larger C&I installations without aesthetic compromise.
PERC-based modules top out at 21.9% efficiency, while Longi's newer generation (Hi-MO X10, HPBC 2.0) already reaches 23-24%+, and competing N-type TOPCon panels offer a better temperature coefficient and lower long-term degradation.
The linear power warranty runs 25 years with a 12-year product warranty, whereas JA Solar DeepBlue 3.0 Pro offers up to 30 years of power warranty under the same 12-year product warranty term, making Longi's offer less competitive on long-term investment security.
The series is offered only in monofacial form, ruling out the additional energy gain (typically 5-10%) that bifacial panels — available from some competitors in this power segment — deliver on ground-mount or high-albedo roof installations.
- At 21.3% efficiency, this panel is on par with typical PERC 550-600W modules
- At 212.9 W/m² power density, roof space requirements are typical for PERC 550-600W panels
- At -0.34%/°C, hot weather performance is typical for PERC 550-600W panels
- 27.5 kg weight - 3.3 kg lighter than PERC 550-600W median (30.8 kg), reducing installation effort
- In the top 61% for efficiency among all PERC panels
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
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