Strong in heat, no clear weak spot
The JS Solar 120 Series consists of modules with a 120 half-cut cell configuration, designed to operate reliably even under less-than-ideal rooftop conditions. The cell division minimizes losses due to partial shading and helps maintain higher energy production throughout the day, which significantly improves self-consumption in residential and small business installations.
A key feature of this series is the combination of multi-busbar technology with a refined connection architecture, which improves current collection and resistance to micro-cracks that may occur during transport or installation. Furthermore, the modules have proven resistance to PID, which is particularly important in installations operating for years at high string voltages. The use of tempered, low-iron glass and a robust construction also supports high mechanical resistance to environmental loads.
The JS Solar 120 Series is suitable for residential rooftops, small and medium-sized commercial installations, and retrofits, where compatibility with popular inverters and easy adaptation to limited space 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 -0.350. Ranked 1,309th in the whole database.
The 120-cell half-cut layout halves each cell, cutting working current and resistive losses by ~50% versus standard full cells. Multi-busbar (MBB) interconnection shortens the current path and reduces microfracture-induced degradation — a meaningful advantage for modules subject to thermal cycling and handling stress.
The series carries verified resistance to Potential Induced Degradation (PID), critical for string systems operating above 600 V DC. Maintaining PID immunity protects real annual energy yield over the full lifetime of the installation.
The highest-power variant delivers 20.3% module efficiency, outperforming Boviet Solar VEGA Series (20.0%) and Boviet GAMMA Series™ (20.2%) among the listed peer comparables. Only ENCOR EC (20.59%) scores higher in this peer group, placing JS Solar 120 Series in the upper tercile of the comparable PERC segment.
Six power bins within a single series (350 / 355 / 360 / 365 / 370 / 375 Wp) allow precise capacity matching to constrained roof areas or inverter MPPT input ranges without switching to a different product family.
All variants carry a 25-year linear performance warranty — in line with the mid-market segment standard. A linear degradation schedule eliminates the risk of abrupt threshold breaches mid-lifetime, providing predictable yield modeling over the full BoS lifetime.
JS Solar does not appear on the BloombergNEF Tier-1 module manufacturer list (as of Q1 2026), unlike peer comparable Boviet Solar, which holds BNEF Tier-1 status in Q1 2026. The absence of bankability complicates non-recourse project financing and may reduce residual asset value in PPA assignments or refinancing scenarios.
Lower-tier variants in this series carry only a 10-year product warranty, versus the 12–15 year market standard for mid-market modules. Opting for the shorter-warranty SKU increases out-of-pocket replacement risk once coverage lapses, particularly for installations with 20+ year expected BoS lifetimes.
The series uses P-type PERC cells, a technology widely commercialized before 2019. Competing N-type TOPCon modules show lower LID/LeTID degradation rates and a better temperature coefficient (typically –0.30%/°C vs. –0.35%/°C for PERC), which can translate to 2–4% higher cumulative energy yield over a 25-year service life.
- Efficiency of 19.5% matches the PERC 0-400W median
- At 194.6 W/m² power density, roof space requirements are typical for PERC 0-400W panels
- Temperature coefficient of -0.28%/°C vs median -0.36%/°C means ~3% less power loss at 65°C
- In the top 90% 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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