EKO MP-11 - Page 49

EKO INSTRUMENTS CO., LTD. I-V Curve Checker MP-11 Instruction Manual Ver.7
Pg. 48
I-V Curve Zoomed View
Pressing the +/- button while the I-V curve is displayed will show the
graph in zoomed-up view; the zoom up effect changes by x2, x4, and
x8 as each time the +/- button is pressed.. Also the graph can be
moved by Left/Right buttons to change the displayed area.
The current (A) and voltage (V) values are indicated at the top of the
screen.
Use this function to find the slight reverse curve point on I-V curve.
P-V Curve (x-axis: Voltage (V), y-axis: Power (W))
P-V curve graph is a graph which is corrected from I-V curve to Voltage
and Power relationship. When a graph is indicated with x-axis for
voltage and y-axis for power, the power peak point is called “maximum
power, Pm”.
Derivation Curve (x-axis: Voltage (V), y-axis: Derivation Value)
Derivation curve is a graph which determines whether there is a
reverse curve point in the I-V curve by taking the y-axis for derivation
value for current against a graph to x-axis for voltage (V) (dI/dV).
The I-V curve gets distracted if there is a hotspot or shade in a part of
PV module or part of cells in the PV modules are defected and
deteriorated. With this function, even a subtle distraction which is
difficult to see on the I-V curve is emphasized and indicated clearly.
Measurement Information
DATE: YYYY/MM/DD
TIME: hh:mm:ss
Irradiance: Solar Irradiance (W/m
2
)
Module temp.: PV Module Back Surface Temperature (℃)
temp2: Ambient Temperature (℃)
Characteristics Values 1/2
Voc: Open Circuit Voltage (V)
Isc: Short Circuit Current (A)
Pm: Maximum Power (W)
Vpm: Maximum Power Voltage (V)
Ipm: Maximum Power Current (A)
Characteristics Values 2/2
Pm(STC) : Standard Test condition Maximum Power (W)
Voc(STC): Standard Test condition Open Circuit Voltage (V)
Isc(STC): Standard Test condition Short Circuit Current (A)
η: Power Generation Efficiency (%)
Ｆ.Ｆ.: Fill Factor (Curve Correction Factor)
※ The conversion values Pm(STC), Voc(STC), and Isc(STC) for the IS IEC 60891 standard test
condition are effective when the solar irradiance more than 700W/m
2
. Also all PV module
parameters: α, β, K, Rs, and module area are filled in the parameter setting screen.
P
V
001 EKO ROOF
P-V Curve Graph
Measurement Inforamtion
DATE: 2013/01/10
TIME: 12:10:00
Irradiance: 1000.00 W/m
2
Module temp: 25.0℃
temp2: 25.0℃
001 EKO ROOF
dI/dV
V
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Derivation Graph
2
001 I:2.3 V:5.5
Enlarged I-V Curve Graph
V
I
Characteristics Values1/2
Voc: 11.12 V
Isc: 4.84 A
Pm: 12.88 W
Vpm: 5.52 V
Ipm: 2.33 A
001 EKO ROOF
Characteristics Values 2/2
Pm (STC): 12.88 W
Voc (STC): 4.84 V
Isc (STC): 4.84 W
η: 0.01
FF: 0.24
001 EKO ROOF