Light for its output, no clear weak spot
The JA Solar JAM54S31 380-405/MR series is designed for maximum energy yield from limited rooftop space, without compromising on longevity. These modules utilize half-cut technology, which better withstands partial shading and reduces the risk of localized overheating, as well as multi-busbar (MBB) construction, improving current conduction and operational stability under real-world conditions. In practice, this translates to more predictable energy production throughout the day, even with poorer weather conditions or dirt on the glass.
Another highlight is the enhanced mechanical durability, which is crucial in Poland's climate, especially under snow and wind loads. Thanks to the Full Black aesthetic (depending on the version), the series is often chosen for single-family homes and buildings with high visual standards. This is an excellent choice for installers and investors who wish to achieve high power density, durability, and a refined appearance - without paying for premium solutions.
Ranking
Price offers
| Shop | Country | Price | Per kWp | Stock | Offer updated | Link to shop |
|---|---|---|---|---|---|---|
| AZ Solar Shop | Italy | 155 € incl. VAT | 392.40 €/kWp | In stock | 12h ago | Visit shop |
Signals from the data
Residential, commercial and shaded-installations.
Top 3% of the PERC 350-400 W segment, against a median of 55.8. Ranked 2,878th in the whole database.
Splitting cells in half reduces series resistance and lowers hot-spot risk under partial shading. The 11-busbar MBB layout shortens current paths by up to 30% compared to 5-busbar predecessors, improving energy yield at low irradiance and under diffuse light conditions.
JA Solar holds continuous BNEF Tier-1 bankable status, confirmed on the Q2 2026 list. With annual manufacturing capacity exceeding 80 GW and operations since 2005, the company presents minimal counterparty risk for project finance.
The 405 Wp variant reaches 20.7% module efficiency — on par with EGing PV STAR (20.74%) and VSUN405-108BMH (20.74%), and above Goldi GS10-M108-BF (20.66%), confirming the series' competitiveness within the 108-cell PERC power class.
IEC 61215 and IEC 61730 certified to withstand 5400 Pa front load (snow) and 2400 Pa rear load (wind) — values relevant to Central European climates where snow load standards reach 1.5–3.0 kN/m² depending on zone.
Production of the JAM54S31 380-405/MR was discontinued around 2023. Module availability is limited to remaining warehouse stock, complicating replacement sourcing for damaged units and potentially affecting warranty claim processing given the inactive production line.
P-type PERC cells exhibit initial LID of 1.5–3% due to boron-oxygen defects, versus 0.2–0.5% for N-type TOPCon. Annual degradation for PERC runs at 0.45–0.55% vs. 0.30–0.40% for TOPCon, resulting in ~84.8% power retention after 25 years compared to >90% for TOPCon modules — translating to a higher LCOE for new installations.
The series is monofacial (is_bifacial = false), while comparable products in the same power class (e.g., Goldi GS10-M108-BF) offer an additional 5–15% rear-side yield under favorable albedo conditions. At identical nameplate power, this results in lower real-world annual energy output on installations over light-colored surfaces.
- 20.2% module efficiency - 0.8pp better than the PERC 0-400W median of 19.4%
- At 202.3 W/m² power density, this panel generates 7.9 W/m² more per unit area than PERC 0-400W median (194.4 W/m²)
- At -0.35%/°C, hot weather performance is typical for PERC 0-400W panels
- Weight of 19.5 kg is typical for PERC 0-400W panels
- #11956 for efficiency, #10419 for temperature performance out of 14005 panels
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
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