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
IVR-1200MPPT
IVR-2400MPPT
Charging Current (MPPT)
55 Amp
System DC Voltage
12Vdc
24Vdc
Operating Voltage Range
15~80Vdc
30~80Vdc
Max. PV Array Open Circuit Voltage
100Vdc
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 range
IVR-1200MPPT
15V~18V
IVR-2400MPPT
30V~32V
Note: * Vmp: panel max power point voltage.
The PV charger efficiency is maximized while PV system voltage is close to Best Vmp
range.
Maximum PV module numbers in Series: Vmpp of PV module * X pcs
≒
Best Vmp of Inverter
PV module numbers in Parallel: Total PV module numbers / Maximum PV module numbers in series
Total PV module numbers = Max. Charging power of inverter / Pmax of PV module / 0.8 (MPPT
conversion rate)
Take
IVR-1200MPPT
inverter as an example to select proper PV modules. After considering Voc of PV module not
exceeds 100Vdc and max.
Maximum Power (Pmax)
150W
Max. PV module numbers in series
1
→
18.1 × 1 ≈ 15~ 18
Max. Power Voltage Vmpp(V) 18.1V
Max. Power Current Impp(A) 8.31A
Total PV module numbers
7→(753W ÷ 150W)/0.8= 6.3
≒
7
PV module numbers in parallel
7 / 1 = 7
Open Circuit Voltage Voc(V)
22.4V
Short Circuit Current Isc(A)
8.66A
Maximum PV module numbers in Series: 1
PV module numbers in Parallel:
7
Total PV module numbers:
7
Take
IVR-2400MPPT
inverter as an example to select proper PV modules. After considering Voc of PV module not
exceeds
100Vdc and max.
Maximum Power (Pmax)
260W
Max. PV module numbers in series
1
→
30.9 × 1 ≈ 30 ~ 32
Max. Power Voltage Vmpp(V) 30.9V
Max. Power Current Impp(A) 8.42A
Total PV module numbers
8→(1507W ÷ 260W)/0.8= 7.2
≒
8
PV module numbers in parallel
8 / 1 = 8
Open Circuit Voltage Voc(V)
37.7V
Short Circuit Current Isc(A)
8.89A
Maximum PV module numbers in Series: 1
PV module numbers in Parallel:
8
Total PV module numbers:
8
