4
PV Module Selection:
When selecting proper PV modules, please be sure to consider below requirements first:
1. Open circuit Voltage (Voc) of PV modules not exceeds max. PV array open circuit voltage of inverter.
INVERTER MODEL Pro1200VA Pro2400VA
Charging Current (PWM)
50Amp
System DC Voltage
12Vd
c
24V
dc
Operating Voltage Range 15~18Vdc 30~32Vdc
Max. PV Array Open Circuit Voltage
40Vd
c
60Vd
c
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 cannot meet this requirement, it’s necessary to have several PV modules
in series connection. Refer to below table.
Model Best
Vmp
Vmp range
1200VA
15Vdc
15V~18V
2400VA
30Vdc
30V~32V
Note: * Vmp: panel max power point voltage.
The PV charging efficiency is 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
PV module numbers in Parallel: Max. charging current of inverter / Impp
Total PV module numbers = maximum PV module numbers in series * PV module numbers in
parallel
Take 1200VA inverter as an example to select proper PV modules. After considering Voc of 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)
85W Max. PV module numbers in series
1 17.6 x 1 ≒ 15 ~ 18
Max. Power Voltage Vmpp(V) 17.6V
Max. Power Current Im
A
4.83A
PV module numbers in parallel
10 50 A / 4.83
Total PV module numbers
1 x 10 = 10
Open Circuit Voltage Voc(V) 21.6V
Short Circuit Current Isc(A) 5.03A
Maximum PV module numbers in Series: 1
PV module numbers in Parallel: 10
Total PV module numbers: 1 x 10 = 10
Take 2400VA inverter as an example to select proper PV module. After considering Voc of PV module not exceed
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)
260W
Max. PV module numbers in series
1 30.9 x 1 ≒ 30 ~ 32
Max. Power Volta
e Vmpp(V) 30.9V
Max. Power Current Impp(A)
8.42A PV module numbers in parallel
6 50 A / 8.42
Total PV module numbers
1 x 6 = 6
Open Circuit Volta
e Voc(V)
3
.7V
Short Circuit Current Isc(A)
8.89A
Maximum PV module numbers in Series: 1
PV module numbers in Parallel: 6
Total PV module numbers: 1 x 6 = 6