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4.4 PV Module Selection
The following parameters can be found in each PV panel's specification, when selecting
proper PV modules, please be sure to consider below requirements first:
·Voc: Open Circuit Voltage (V)
·Vmpp: Max. Power Voltage (V)
·Isc: Short Circuit Current (A)
1.
Open circuit Voltage (Voc) of PV modules not exceeds max. PV array open circuit voltage of inverter.
Model
MAX. INPUT POWER
CHARGING CURRENT (PWM)
System DC Voltage
OPTIMAL WORK VOLTAGE RANGE
MAX. PV INPUT VOLTAGE
2.
Max. Power Voltage (Vmpp) of PV modules should be close to Best Vmp of inverter or within Vmp
range to get best performance. If one PV module can't meet this requirement, it's necessary to have
several PV modules series connection. Refer to below table.
Model
SCC SKY INVERTER 1000
SCC SKY INVERTER 2000
Note: Best Vmp: panel max power point voltage.
The PV charging efficiency if maximized while PV system voltage is close to Best Vmp.
Maximum PV module numbers in Series
Vmpp of PV module * X pcs ≒ Best Vmp of
Inverter or Vmp range.
Total PV module numbers = maximum PV module number in series * PV module number in parallel
Example 1: SCC SKY INVERTER 1000
After considering Voc PV module not exceeds 40Vdc and max. Vmpp of PV module close to 15Vdc or within
15Vdc~18Vdc, we can choose PV module with below specification.
Maximum Power (Pmax)
Max. Power Voltage Vmpp(V)
Max. Power Current Impp(A)
Open Circuit Voltage Voc(V)
Short Circuit Current Isc(A)
Maximum PV module numbers in Series: 1
PV module numbers in parallel: 10
Total PV module numbers: 1 × 10 = 10
Example 2: SCC SKY INVERTER 2000
After considering Voc PV module not exceeds 60Vdc and max. Vmpp of PV module close to 30Vdc or within
30Vdc~32Vdc, we can choose PV module with below specification.
Maximum Power (Pmax)
Max. Power Voltage Vmpp(V)
Max. Power Current Impp(A)
Open Circuit Voltage Voc(V)
Short Circuit Current Isc(A)
Maximum PV module numbers in Series: 1
PV module numbers in parallel: 6
Total PV module numbers: 1 × 6 = 6
SCC SKY INVERTER User Manual
SCC SKY INVERTER 1000
Max. charging current of inverter / Impp
84W
Max. PV module number in series
17.22 × 1 ≒ 15~18 →1
17.22V
4.85A
PV module number in parallel : 50A/4.85A=10.31 ≈ 10
21.97V
Total PV module numbers : 1 × 10 = 10
5.23A
255W
Max. PV module number in series
30.65 × 1 ≒ 30~32 →1
30.65V
8.31A
PV module number in parallel : 50A/8.31A=6.02 ≈ 6
37.93V
Total PV module numbers : 1 × 6 = 6
8.62A
·Pmax: Maximum Power (W)
·Immp: Max. Power Current (A)
600W
50Amp
12Vdc
15V~18V
40V
Best Vmp
15Vdc
30Vdc
PV module numbers in parallel
5
SCC SKY INVERTER 2000
1200W
24Vdc
30V~32V
60V
Vmp range
15V~18V
30V~32V
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