Trina Solar TSM-645NEG21C20

Mono-c-Si Bifacial

645 W Pmax

46.0 V Voc

17.92 A Isc

38.1 V Vmp

16.92 A Imp

20.93 % eff.

0.782 FF

66 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	644.652	W
PTC Power	PTC	609.6	W
Open-circuit voltage	V_oc_ref	46.0	V
Short-circuit current	I_sc_ref	17.92	A
Max-power voltage	V_mp_ref	38.1	V
Max-power current	I_mp_ref	16.92	A
Fill factor	FF	0.782	—
Efficiency (STC)	η	20.93	%
Temperature Coefficients
Isc temperature coefficient	alpha_sc	0.007347	A/°C
Voc temperature coefficient	beta_oc	-0.11178	V/°C
Pmax temperature coefficient	gamma_r	-0.3	%/°C
NOCT	T_NOCT	44.3	°C
Single-Diode (De Soto) Parameters
Modified ideality factor	a_ref	1.59556	V
Light-generated current (ref)	I_L_ref	17.93957	A
Saturation current (ref)	I_o_ref	5.32e-12	A
Series resistance	R_s	0.16986	Ω
Shunt resistance (ref)	R_sh_ref	155.537	Ω
Cells in series	N_s	66	—
CEC Adjust factor	Adjust	1.2729	%

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Module Specifications

Technology Mono-c-Si

Bifacial Yes

BIPV No

Cells in series 66

Module area 3.08 m²

NOCT 44.3 °C

Temp. coefficient of Pmax -0.300 %/°C

Temp. coefficient of Voc -0.243 %/°C

Temp. coefficient of Isc 0.041 %/°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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