MPPT PRO-X 10A | 20A | 30A | 40A
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3.3.
Wire Size
The wiring and installation methods must conform to national and local electrical code
requirements.
PV Wire Size
The PV array output varies with the PV module size, connection method, and sunlight angle. The PV
array's short circuit current (ISC) can calculate the minimum PV wire size. Please refer to the value of
Isc in the PV module specification. When PV modules are connected in series, the Isc equals a PV
module Isc. When PV modules are connected in parallel, the Isc equals the sum of the PV modules’
Isc. The Isc of the PV array must not exceed the controller’s maximum PV input current. Please refer
to the table below:
NOTE:
All PV modules in each array are assumed to be identical.
Isc = short circuit current (amps); Voc = open circuit voltage.
Model
max. PV input current
max. PV wire size*
PRO-X 10A
10A
4mm
2
/12AWG
PRO-X 20A
20A
6mm
2
/10AWG
PRO-X 30A
30A
10mm
2
/8AWG
PRO-X 40A
40A
16mm
2
/6AWG
* These are the maximum wire sizes that will fit the controller terminals.
CAUTION
When the PV modules are connected in series, the open-circuit voltage of the PV
array must not exceed 92V (PRO-X 10A/20A), 138V (PRO-X 30A/40A) at 25
℃
environment temperature.
Battery and Load Wire Size
The battery and load wire size must conform to the rated current. The reference size is as below:
Model
rated
charge
current
rated
discharge
current
battery wire size
load wire size
PRO-X 10A
10A
10A
4mm
2
/12AWG
4mm
2
/12AWG
PRO-X 20A
20A
20A
6mm
2
/10AWG
6mm
2
/10AWG
PRO-X 30A
30A
30A
10mm
2
/8AWG
10mm
2
/8AWG
PRO-X 40A
40A
40A
16mm
2
/6AWG
16mm
2
/6AWG
CAUTION
The wire size is only for reference. Suppose there is a long distance
between the PV array, the controller, and the battery. In that case, larger
wires can be used to reduce the voltage drop and improve performance.
The recommended battery wire is selected when the battery terminals are
not connected to any additional inverter.
