Light for its output, no clear weak spot
The Gamko New Energy GKA166M120 (360W-380W) series is a range of modules designed for real-world installation conditions - where stable output, low losses, and predictability over the long term are key. The use of monocrystalline PERC technology enhances performance in low-light conditions and cooler weather, which is important in the Polish climate. The 120-cell design helps to minimize losses in partially shaded conditions and facilitates matching with popular inverters. The low temperature coefficient also helps to maintain performance in hot conditions on a roof. The panel features a robust front glass, which helps to ensure durability in windy, snowy, and hail conditions. This is a good choice for single-family homes, small businesses, and rooftop and ground-mounted installations, where a long power warranty and trouble-free operation are important.
Ranking
Signals from the data
Residential, commercial and shaded-installations.
Top 2% of the PERC 350-400 W segment, against a median of 55.8. Ranked 2,404th in the whole database.
Top 13% of the PERC 350-400 W segment, against a median of 25 yrs.
Top 16% of the PERC 350-400 W segment, against a median of 199.0.
The top-tier variant in the series achieves 20.85% module efficiency, outperforming direct peer comparables such as the Heckert Solar NeMo® 3.0 120 M (20.0%) and matching the VDS-S120/M6H (20.8%). For rooftop installations with limited available area, this translates into meaningfully higher energy yield.
The manufacturer provides a 30-year linear warranty on power output, a requirement increasingly mandated by banks financing both prosumer and commercial PV installations. The warranty aligns with the current mid-range segment standard for PERC modules.
Splitting the module into three independent sections (3 × 40 cells) limits partial-shading losses to one-third of the module area, making it well-suited to the MPPT inverters widely available in the Polish market. The half-cut cell technology also reduces resistive heating at interconnections under load.
IEC 61215 certification confirms resistance to wind loads of 2,400 Pa and snow loads of 5,400 Pa - values sufficient for Polish climatic conditions (normative snow load for most of Poland: 1,200-2,000 Pa per PN-EN 1991-1-3). Additional IEC 61730 and ISO 9001 certifications, together with verified resistance to salt mist and ammonia, further substantiate product reliability.
PERC cells exhibit a higher first-year light-induced degradation (LID) rate (~2%) compared to modern N-type TOPCon cells (~1%), with annual energy yield estimated to be 1.5-2.5% lower according to industry analyses (PV Tech, SolarNPlus 2025). Over a 30-year system lifetime, the cumulative generation gap relative to TOPCon modules of equivalent rated power can amount to several hundred kWh per kWp.
The product warranty stands at 12 years, whereas leading Tier-1 manufacturers - including Jinko Solar, JA Solar, and LONGi - routinely offer 15-year product warranties on modules in a comparable power class. For commercial installations subject to insurer or lender requirements, a 12-year warranty may prove insufficient.
Gamko New Energy (Nantong), with annual production capacity of approximately 1.2 GW, does not appear on the BloombergNEF or Wood Mackenzie H1 2025 Tier-1 module manufacturer lists, implying elevated long-term manufacturer financial risk. For investors requiring bankability due diligence, this represents a material limitation.
- Efficiency of 20.3% is 0.9pp above the PERC 0-400W median (19.4%)
- Power density of 203.0 W/m² packs 8.8 W/m² more into the same footprint vs PERC 0-400W median (194.2 W/m²)
- At -0.36%/°C, hot weather performance is typical for PERC 0-400W panels
- 18.0 kg weight - 2.5 kg lighter than PERC 0-400W median (20.5 kg), reducing installation effort
- Ranked #11851 out of 14129 panels for efficiency in the database
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Alternatives
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About the GKA166M120 (360W–380W) series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.