Module: JA Solar JAM66D45-LB
Rated Power: 620 Wp
Efficiency: ~23.0%
Dimensions: 2,382 mm × 1,134 mm × 30 mm
Weight: ~33.1 kg
Cell Type: Monocrystalline N-type TOPCon, 132 cells
Construction: Bifacial double-glass (glass-glass)
Maximum System Voltage: 1,500 V DC
Temperature Coefficient of Pmax: –0.29 %/°C
Warranty: 12 years product / 30 years performance (~87% remaining)
Other: IP68 junction box, MC4-EVO2 connectors, 0/+3% power tolerance
The JA Solar JAM66D45-LB is a high-performance monocrystalline N-type TOPCon bifacial glass-glass module, rated up to 620 W. It is ideal for commercial rooftops, ground-mounted solar farms or off-grid systems in Nigeria where high solar irradiance and hot ambient conditions demand robust, efficient modules.
Rated Maximum Power (STC): up to 620 W. longkesolar.com+1
Module Efficiency: up to ≈ 23 % (e.g., 23.0 % for 620 W version). japvpanel.com+1
Power Tolerance: 0 ~ +3 %. hyztsolar.com+1
Dimensions: 2,382 mm × 1,134 mm × ~30 mm. jasolar.eu+1
Weight: ~33.1 kg. japvpanel.com
Cell Type: Monocrystalline N-type TOPCon, 132 cells (6×22 layout) for this series. jasolar.eu+1
Bifacial Double Glass Construction: glass-glass module design for enhanced durability and energy yield. solartraders.com+1
Maximum System Voltage: typically up to 1,500 V DC for large installations. ENF Solar+1
Junction Box: IP68 rated with 3 diodes; connectors MC4-EVO2 or equivalent. longkesolar.com+1
Temperature Coefficient of Pmax: approx –0.29 %/°C (suitable for hot climates). jasolar.com
Warranty: 12 years product warranty typical; 30-year linear performance warranty (e.g., ~87% output at year 30). solartraders.com+1
High power output (620 W): More power per module means fewer modules needed to reach your target kW capacity, which can reduce balance-of-system (BOS) costs.
High efficiency (~23%): In Nigeria’s high-irradiance environment, more efficient modules mean more kWh per square metre—important where roof/land space may be limited.
N-type TOPCon technology: Offers improved low-light performance, reduced light-induced degradation (LID) and better long-term performance—valuable under variable weather or dust conditions prevalent in Nigeria.
Bifacial double-glass design: If the installation allows some reflected light (e.g., bright ground surface, white back sheet or elevated frame), the back side can contribute additional yield. Also gives extra mechanical robustness (important for storm/wind exposure).
High temperature resilience: With favourable temperature coefficients and designed for high system voltage, this panel is suited to Nigeria’s hot ambient temperatures and high solar incidence.
Bankable manufacturer: JA Solar is widely recognised globally, which adds credibility for financing, warranties and long-term service—important for commercial/industrial solar projects in Nigeria.
