Middle of its segment, heavy for its output
The Jinko Solar JSHC166M120 series is designed for high power output without increasing the risk of failures during daily operation. The use of half-cut technology reduces energy losses in the module and improves performance under partial shading, which, in Polish conditions (chimneys, trees, skylights), translates into more stable yields. The design based on multi-busbar technology supports better current collection and performance in low-light conditions, while the dense interconnection grid enhances efficiency without the need to "inflate" parameters on paper.
Compared to many competing panels, this series stands out due to its focus on durability: the manufacturer emphasizes minimizing microcracks through precise cutting, as well as PID resistance, which refers to power drops caused by potential differences in the installation. This is a good choice for single-family homes, commercial rooftops, and micro-installations, where reliability, predictable yields, and a quick return on investment are important.
Ranking
Signals from the data
Residential, commercial and shaded-installations.
Weight-limited structures and owners who want a long output guarantee.
Bottom 1% of the 275-475 W band, against a median of 53.6. Ranked 13,991st in the whole database.
Bottom 20% of the 275-475 W band, against a median of 30 yrs.
The top-tier variant reaches 21.3% conversion efficiency, outperforming direct peer comparables: Boviet Solar VEGA (max 20.0%) and ENCOR EC (max 20.59%). On roof areas with limited space, this translates to a measurably higher annual energy yield without increasing the module count.
Half-cut cell design reduces resistive losses to ¼ of those in full-cell modules, while the dense MBB layout shortens current conduction paths by over 50%. In practice, this improves performance under partial shading (chimneys, dormers) - a significant factor in typical Central European residential rooftop conditions.
The series meets IEC 61215 and IEC 61730 requirements for potential-induced degradation resistance. PID is a key risk factor in systems with ungrounded DC strings or long cable runs - a common configuration in Polish prosumer microinstallations.
The manufacturer holds the top position in the Bloomberg NEF bankability ranking (2025 report: sole manufacturer rated bankable by 100% of surveyed respondents) and leads global module shipments at 86.8 GW in 2025. Tier-1 status materially reduces investment risk and facilitates project financing.
Jinko Solar guarantees linear power degradation over 25 years, in line with the segment standard. Combined with Jinko's Tier-1 financial standing, the risk of warranty non-enforcement is significantly lower than with Tier-2 or Tier-3 manufacturers.
P-type PERC cells exhibit higher light-induced degradation (LID) and a worse temperature coefficient than modern TOPCon or HJT architectures. As of 2026, the premium segment is dominated by N-type modules - choosing this series means accepting a higher annual degradation rate (approx. 0.55% vs. approx. 0.40% for TOPCon).
The series is built on M6 (166 mm) wafers, while the industry shifted to M10 (182 mm) and G12 (210 mm) between 2022 and 2026, delivering lower cost-per-Wp and better BoS economics (fewer modules for the same system power). The absence of an updated SMBB architecture may limit pricing competitiveness and availability in new tender processes.
The series is monofacial only (is_bifacial: false). On commercial flat rooftops or ground-mount systems, bifacial PERC or TOPCon modules typically generate 5-15% additional yield from reflected albedo. Selecting this series forecloses that yield improvement without switching products.
Across 6 variants, the efficiency spread reaches 2.4 percentage points. Lower-power variants (350 Wp, approx. 18.9%) fall well short of same-segment competitors - ENCOR EC achieves 20.59% at its 375 Wp maximum. Buyers should verify which specific variant is actually delivered, as the stated series range can obscure significant performance differences.
- Efficiency of 21.3% is 0.5pp below the database median (21.8%)
- At 206.0 W/m², this panel generates 12.1 W/m² less per unit area than database median (218.1 W/m²)
- At -0.34%/°C, loses 0.04pp more power per degree than database median (-0.30%/°C)
- Weight of 34.0 kg is 7.5 kg above database median (26.5 kg) - verify structural support
- Ranked #8585 out of 14129 panels for efficiency in the database
Specifications
Datasheet charts
Measured curves published by Jinko Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 375 Wp appear here. The rest cover the whole series.
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Found 170 panels of the same or similar size to this one, within ±10 mm. See them here Found 257 panels of the same or similar size to this one, within ±25 mm. See them here Found 332 panels of the same or similar size to this one, within ±50 mm. See them here Found 4180 panels of the same or similar size to this one, within ±100 mm. See them here
About the JSHC166M120 series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.