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475Wp
JA Solar JAT54S40-475/LR
JA Solar Review

JAT54S40-475/LR

Monocrystalline
23.80%
Efficiency
237.7 Wp/m²
Power Density
-0.260%/°C
Temp. Coeff. Pmax chart
394W from 475W
Power after 30 years
  • Efficiency of 23.8% is 1.3pp above the TOPCon 450-500W median (22.5%)
  • Power density of 237.7 W/m² packs 12.5 W/m² more into the same footprint vs TOPCon 450-500W median (225.2 W/m²)
  • -0.26%/°C temperature coefficient (median: -0.29%/°C) - retains ~1% more power at high temperatures
  • Weight of 19.3 kg (4.7 kg below TOPCon 450-500W median of 24.0 kg) allows easier transport and roof mounting
  • Ranked #306 out of 11672 panels for efficiency in the database
Performance Profile
Price Offers 0
Shop Country Price Price/kWp
Series JAT54S40 LR (n-type Monofacial Module) 6 variants
Efficiency Range 23.5% - 24.3%
Avg. Efficiency 23.77%
Technology TOPCon
Dimensions 1762 × 1134 mm
Show series description

JA Solar JAT54S40 LR series modules are monofacial solar panels based on N-type TOPCon cells, designed for stable energy production in real rooftop conditions. The key advantage is their very low LID degradation, ensuring the installation maintains high efficiency for a longer period without the typical drop-off after commissioning. In practice, this means more predictable yields and better profitability throughout the system's lifespan.

Another notable feature is the improved temperature coefficient, which minimizes power losses on hot days – particularly important for dark rooftops and installations with poor ventilation. The modules utilize the GFI (gapless) structure, supporting efficient surface utilization and an aesthetic appearance. An additional benefit is optimized performance under low-light conditions, which aids during transitional periods and light cloud cover.

This is an excellent choice for single-family homes, multi-family buildings, and commercial projects, where durability, reliable performance, and high workmanship standards matter.

Panels from the same series differ mainly in power output while having identical dimensions. Learn why →
Electrical Parameters (STC)
Nominal Power (Pmax)475 Wp
Module Efficiency23.80%
Voltage at Max Power (Vmpp)34.87 V
Current at Max Power (Impp)13.63 A
Open Circuit Voltage (Voc)41.03 V
Short Circuit Current (Isc)14.90 A
Max System Voltage1500 V
Temperature Coefficients
Temp. Coeff. Pmax-0.260%/°C
Temp. Coeff. Voc-0.220%/°C
Temp. Coeff. Isc0.050%/°C
NOCT45°C
Cell Technology
Cell TypeMonocrystalline
Cell Count108
BifacialNo
Bifaciality Factor-
Dimensions & Weight
Length1762 mm
Width1134 mm
Height30 mm
Weight19.3 kg
Area2.00 m²
Power Density237.7 Wp/m²
Warranty
Product Warranty15 years
Performance Warranty30 years
End-of-Warranty Output83.5%
First Year Degradation1.00%
Annual Degradation0.55%/year
Key Specifications
23.80%
Efficiency
475 Wp
Power
-0.26%/°C
Temp Coeff
30 yrs
Warranty