BYD Company Limited BYD665MSTK-33

Mono-c-Si

665 W Pmax

45.85 V Voc

18.27 A Isc

38.12 V Vmp

17.45 A Imp

22.17 % eff.

0.7941 FF

66 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	665.194	W
PTC Power	PTC	622.2	W
Open-circuit voltage	V_oc_ref	45.85	V
Short-circuit current	I_sc_ref	18.27	A
Max-power voltage	V_mp_ref	38.12	V
Max-power current	I_mp_ref	17.45	A
Fill factor	FF	0.7941	—
Efficiency (STC)	η	22.17	%
Temperature Coefficients
Isc temperature coefficient	alpha_sc	0.009318	A/°C
Voc temperature coefficient	beta_oc	-0.117834	V/°C
Pmax temperature coefficient	gamma_r	-0.34	%/°C
NOCT	T_NOCT	45.4	°C
Single-Diode (De Soto) Parameters
Modified ideality factor	a_ref	1.6828	V
Light-generated current (ref)	I_L_ref	18.27	A
Saturation current (ref)	I_o_ref	2.68e-11	A
Series resistance	R_s	0.14367	Ω
Shunt resistance (ref)	R_sh_ref	999999.754	Ω
Cells in series	N_s	44	—
CEC Adjust factor	Adjust	8.8904	%

The CEC list gives 44 cells in series, which puts 1.04 V on each cell. A silicon cell gives 0.55 to 0.80 V, so PV Ivy uses 66 cells in series for the .PAN file and Similar Modules, found from the CEC count times 1.5 (it counts the half cells of one bypass substring).

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-1.4946	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 No

BIPV No

Cells in series 66 (inferred, CEC lists 44)

Module area 3.0 m²

NOCT 45.4 °C

Temp. coefficient of Pmax -0.340 %/°C

Temp. coefficient of Voc -0.257 %/°C

Temp. coefficient of Isc 0.051 %/°C

CEC list On the 23 Jun 2026 list

Parameters from 23 Jun 2026 list

Measured Data

No measured data yet for this module.

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