Yingli Energy (China) YL445DF72 1/2

Mono-c-Si Bifacial

445 W Pmax

49.6 V Voc

11.36 A Isc

41.4 V Vmp

10.74 A Imp

20.97 % eff.

0.7891 FF

72 cells

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IV & PV Curves at STC (1000 W/m², 25 °C)

IV Curves at Multiple Conditions

Irradiance sweep at 25 °C

Temperature sweep at 1000 W/m²

Single-Diode Model Parameters

Source: California Energy Commission module list · retrieved via SAM library · energy.ca.gov · All data sources

Parameter	Symbol	Value	Unit
Nameplate (STC)
STC Power	STC	444.636	W
PTC Power	PTC	418.4	W
Open-circuit voltage	V_oc_ref	49.6	V
Short-circuit current	I_sc_ref	11.36	A
Max-power voltage	V_mp_ref	41.4	V
Max-power current	I_mp_ref	10.74	A
Fill factor	FF	0.7891	—
Efficiency (STC)	η	20.97	%
Temperature Coefficients
Isc temperature coefficient	alpha_sc	0.004544	A/°C
Voc temperature coefficient	beta_oc	-0.129952	V/°C
Pmax temperature coefficient	gamma_r	-0.331	%/°C
NOCT	T_NOCT	44.0	°C
Single-Diode (De Soto) Parameters
Modified ideality factor	a_ref	1.83593	V
Light-generated current (ref)	I_L_ref	11.8603	A
Saturation current (ref)	I_o_ref	2.06e-11	A
Series resistance	R_s	0.22571	Ω
Shunt resistance (ref)	R_sh_ref	68.34	Ω
Cells in series	N_s	144	—
CEC Adjust factor	Adjust	8.6777	%

The CEC list gives 144 cells in series, which puts 0.34 V on each cell. A silicon cell gives 0.55 to 0.80 V, so PV Ivy uses 72 cells in series for the .PAN file and Similar Modules, found from the model name (72 cells).

Additional Model Sources

Source	Model type	Fit quality	Citation
CEC module list (via SAM library) Default	CEC / De Soto single-diode	—	https://www.energy.ca.gov/media/2367
Sandia PVsyst single-diode fit	PVsyst single-diode	NMBE Pmp-2.948	Sandia National Laboratories — PVsyst single-diode parameter translation. See data/pvsyst_params.README.md. https://pvpmc.sandia.gov/

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Module Specifications

Technology Mono-c-Si

Bifacial Yes

BIPV No

Cells in series 72 (inferred, CEC lists 144)

Module area 2.12 m²

NOCT 44.0 °C

Temp. coefficient of Pmax -0.331 %/°C

Temp. coefficient of Voc -0.262 %/°C

Temp. coefficient of Isc 0.040 %/°C

CEC list On the 23 Jun 2026 list

Parameters from 16 Nov 2022 list

Measured Data

No measured data yet for this module.

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