Suntech Power STP255-20/Wem

Multi-c-Si

255 W Pmax

37.6 V Voc

8.76 A Isc

30.8 V Vmp

8.28 A Imp

15.67 % eff.

0.7743 FF

60 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	255.024	W
PTC Power	PTC	232.8	W
Open-circuit voltage	V_oc_ref	37.6	V
Short-circuit current	I_sc_ref	8.76	A
Max-power voltage	V_mp_ref	30.8	V
Max-power current	I_mp_ref	8.28	A
Fill factor	FF	0.7743	—
Efficiency (STC)	η	15.67	%
Temperature Coefficients
Isc temperature coefficient	alpha_sc	0.005309	A/°C
Voc temperature coefficient	beta_oc	-0.128254	V/°C
Pmax temperature coefficient	gamma_r	-0.4457	%/°C
NOCT	T_NOCT	43.8	°C
Single-Diode (De Soto) Parameters
Modified ideality factor	a_ref	1.58157	V
Light-generated current (ref)	I_L_ref	8.7618	A
Saturation current (ref)	I_o_ref	4.13e-10	A
Series resistance	R_s	0.25713	Ω
Shunt resistance (ref)	R_sh_ref	1251.24	Ω
Cells in series	N_s	60	—
CEC Adjust factor	Adjust	8.2553	%

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-0.2683	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 Multi-c-Si

Bifacial No

BIPV No

Cells in series 60

Module area 1.627 m²

Dimensions 1.64 × 0.992 m

NOCT 43.8 °C

Temp. coefficient of Pmax -0.446 %/°C

Temp. coefficient of Voc -0.341 %/°C

Temp. coefficient of Isc 0.061 %/°C

CEC list On the 23 Jun 2026 list

Parameters from 16 Nov 2022 list

Annual degradation 0.55%/yr

Measured Data

No measured data yet for this module.

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