FreeVolt ECP-PVGRAF-HC-BF555-144MT-W

Mono-c-Si

556 W Pmax

52.6 V Voc

12.76 A Isc

45.8 V Vmp

12.13 A Imp

21.53 % eff.

0.8277 FF

72 cells

Same test data as ECP-PVGRAF-HC-BF555-144MT-B. CEC lists each frame, color and backsheet version as its own listing.

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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	555.554	W
PTC Power	PTC	527.3	W
Open-circuit voltage	V_oc_ref	52.6	V
Short-circuit current	I_sc_ref	12.76	A
Max-power voltage	V_mp_ref	45.8	V
Max-power current	I_mp_ref	12.13	A
Fill factor	FF	0.8277	—
Efficiency (STC)	η	21.53	%
Temperature Coefficients
Isc temperature coefficient	alpha_sc	0.005359	A/°C
Voc temperature coefficient	beta_oc	-0.135182	V/°C
Pmax temperature coefficient	gamma_r	-0.292	%/°C
NOCT	T_NOCT	43.2	°C
Single-Diode (De Soto) Parameters
Modified ideality factor	a_ref	1.85197	V
Light-generated current (ref)	I_L_ref	12.76251	A
Saturation current (ref)	I_o_ref	5.83e-12	A
Series resistance	R_s	0.06592	Ω
Shunt resistance (ref)	R_sh_ref	335.691	Ω
Cells in series	N_s	24	—
CEC Adjust factor	Adjust	-0.8462	%

The CEC list gives 24 cells in series, which puts 2.19 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 (144 half cells).

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Module Specifications

Technology Mono-c-Si

Bifacial No

BIPV No

Cells in series 72 (inferred, CEC lists 24)

Module area 2.58 m²

NOCT 43.2 °C

Temp. coefficient of Pmax -0.292 %/°C

Temp. coefficient of Voc -0.257 %/°C

Temp. coefficient of Isc 0.042 %/°C

CEC list On the 23 Jun 2026 list

Parameters from 23 Jun 2026 list

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.

ECP-PVGRAF-HC-BF555-144MT-B Main listing
ECP-PVGRAF-HC-BF555-144MT-W This page

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