First Solar Inc. FS-6420

CdTe

420 W Pmax

218.5 V Voc

2.54 A Isc

180.4 V Vmp

2.33 A Imp

16.95 % eff.

0.7574 FF

264 cells

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	420.332	W
PTC Power	PTC	395.1	W
Open-circuit voltage	V_oc_ref	218.5	V
Short-circuit current	I_sc_ref	2.54	A
Max-power voltage	V_mp_ref	180.4	V
Max-power current	I_mp_ref	2.33	A
Fill factor	FF	0.7574	—
Efficiency (STC)	η	16.95	%
Temperature Coefficients
Isc temperature coefficient	alpha_sc	0.001245	A/°C
Voc temperature coefficient	beta_oc	-0.59869	V/°C
Pmax temperature coefficient	gamma_r	-0.245	%/°C
NOCT	T_NOCT	48.8	°C
Single-Diode (De Soto) Parameters
Modified ideality factor	a_ref	7.3211	V
Light-generated current (ref)	I_L_ref	2.54997	A
Saturation current (ref)	I_o_ref	2.64e-13	A
Series resistance	R_s	6.29636	Ω
Shunt resistance (ref)	R_sh_ref	1604.12	Ω
Cells in series	N_s	264	—
CEC Adjust factor	Adjust	-17.7536	%

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 Pmp1.0612	Sandia National Laboratories — PVsyst single-diode parameter translation. See data/pvsyst_params.README.md. https://pvpmc.sandia.gov/

Actions

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Module Specifications

Technology CdTe

Bifacial No

BIPV No

Cells in series 264

Module area 2.48 m²

NOCT 48.8 °C

Temp. coefficient of Pmax -0.245 %/°C

Temp. coefficient of Voc -0.274 %/°C

Temp. coefficient of Isc 0.049 %/°C

CEC list On the 23 Jun 2026 list

Parameters from 16 Nov 2022 list

Annual degradation 0.5%/yr

Measured Data

No measured data yet for this module.

Same Test Data

2 listings with identical nameplate test data, one per frame, color or backsheet version.

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