5.3 PV Array
The voltage on the PV input should never exceed 200V under any condition.
The charger will be permanently damaged if the input voltage is too high.
Cable strain relief must be provided, close to PV and battery connectors.
5.3.1 PV cables
As the core component of PV system, controller could be suitable for various types of PV
modules and maximize converting solar energy into electrical energy. According to the open
circuit voltage (Voc) and the maximum power point voltage (Vmpp) of the MPPT controller,
the series number of different types PV modules can be calculated.
The required PV cable cross section depends on array power and voltage. The table below
assumes that maximum PV power has been installed. Cable cross section can be reduced in
case of smaller solar arrays.The best efficiency is reached at a PV input voltage that is twice the
battery voltage. DC circuit breakers or fuses must be installed in the positive and negative PV
cables, to enable isolation of the charger during installation or maintenance.
12V System(Solar array up to 750W)
24V System(Solar array up to 1500W)
Solar array
MPP-Voltage[V]
Solar array
MPP-Voltage[V]
Solar array
MPP-Current[A]
Solar array
MPP-Current[A]
Cable Length
2 * 5m
Cable Length
2 * 5m
Cable Length
2 * 10m
Cable Length
2 * 10m
Cable Length
2 * 20m
Cable Length
2 * 20m
18
36
54
72
90
108
≥126
36
54
72
90
108
≥126
42
21
14
10
8
7
6
42
28
21
17
14
12
16mm²/5AWG
10mm²/7AWG
6mm²/10AWG
4mm²/11AWG
2.5mm²/13AWG
2.5mm²/13AWG
2.5mm²/13AWG
16mm²/5AWG
16mm²/5AWG
10mm²/7AWG
6mm²/10AWG
6mm²/10AWG
4mm²/11AWG
35mm²/2AWG
16mm²/5AWG
16mm²/5AWG
6mm²/10AWG
4mm²/11AWG
4mm²/11AWG
4mm²/11AWG
35mm²/2AWG
25mm²/3AWG
16mm²/5AWG
16mm²/5AWG
10mm²/7AWG
6mm²/10AWG
Not recommended
25mm²/3AWG
25mm²/3AWG
16mm²/5AWG
6mm²/10AWG
6mm²/10AWG
6mm²/10AWG
Not recommended
35mm²/2AWG
35mm²/2AWG
25mm²/3AWG
25mm²/3AWG
16mm²/5AWG
9
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