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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.
Max. PV Array Open Circuit 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 cannot meet this requirement, it’s necessary to have several PV modules
in series connection. Refer to below table.
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.
Max. PV module numbers in series
1→18.1 × 1 ≈ 15~ 18
Max. Power Voltage Vmpp(V)
Max. Power Current Impp(A)
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)
Short Circuit Current Isc(A)
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.
Max. PV module numbers in series
1→30.9 × 1 ≈ 30 ~ 32
Max. Power Voltage Vmpp(V)
Max. Power Current Impp(A)
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)
Short Circuit Current Isc(A)
Maximum PV module numbers in Series: 1
PV module numbers in Parallel: 8
Total PV module numbers: 8
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