8 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 9
SECTION 4 |
Principles of Operation
4.1 ELECTRICAL OPERATING PARAMETERS OF SC-05 AND SC-10 PANELS
A solar panel can be considered as a current limited source of electrical power with a current
(I) versus Voltage (V) relationship provided in I-V Curve. I-V Curves for SC-05 and SC-10 are
shown in Fig 4.1 (NOTE: These panels have internal Blocking Diode with Forward Voltage
Drop "V
f
" = 0.55V when conducting).
0.44
0.42
0.40
0.38
0.36
0.34
0.32
0.30
0.28
0.26
0.24
0.22
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.88
0.84
0.80
0.76
0.72
0.68
0.64
0.60
0.56
0.52
0.48
0.44
0.40
0.36
0.32
0.28
0.24
0.20
0.16
0.12
0.08
0.04
Current in Amps
SC-10 SC-05 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1. Max. Power Voltage, V
MP
•
SC-05 : 12.7V
•
SC-10 : 12.7V
2. Max. Power Current, I
MP
•
SC-05 : 0.39A
•
SC-10 : 0.79A
3. Max. Power Point, P
MP
•
SC-05 : 5W
•
SC-10 : 10W
Short Circuit Current, I
SC
•
SC-05 : 0.42A
•
SC-10 : 0.85A
Power Curve
(VxI)
Voltage in V
Open Circuit Voltage, V
OC
•
SC-05 : 15.3V
•
SC-10 : 15.3V
NOTES: 1. Voltages shown are panel voltages measured before the Blocking Diode
2. Blocking Diode has Forward Voltage Drop “V
f
” = 0.55V when conducting
3. When connected to battery, Panel Voltage = Battery V “V
f
” of Blocking Diode
4. Open Circuit Voltage = Panel Voltage
5. Voltages shown are at Panel Temperature = 25ºC. Apply Temperature Coefficient of
Voltage = 0.29% per ºC for other temperatures.
Fig 4.1 I-V Curves: SunChargers SC-05, SC-10
}
}
When exposed to the sun and without any load connected, the solar panels will generate an
Open Circuit Voltage (
Voc
). As soon as a load is connected to the panel, the voltage at the load
will drop and the value of the voltage at the load will be determined by the current (
I
) drawn by
the load. Please note that at the Open Circuit Voltage Voc, the output current (
I
) is zero.
Содержание SC-05
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