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3.3 PV connection
The PV input current of the charge controller is limited to 75A. In case of a potential
solar array output exceeding 75A, the solar array voltage will increase up to the level at
which the output is reduced to 75A.
The voltage on the PV input should never exceed 150V 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.
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.
The table below gives some examples of cable cross sections calculated with formula
(5).
(in this case I and V are the output current and output voltage of the solar array)
Solar array
Solar array
MPP-voltage
MPP-current
[V]
[A]
18
66
36
33
54
22
72
16
90
13
108
11
Solar array
Solar array
MPP-voltage
MPP-current
[V]
[A]
36
66
54
44
72
33
90
27
108
22
12V system (solar array up to 1200W)
Power loss
Length 2x5 meter
in PV cables
2
α (%)
mm
2
35
1
16
1
10
0,75
6
0,5
6
0,5
4
24V system (solar array up to 2400W)
Power loss
Length 2x5 meter
in PV cables
2
α (%)
mm
1
35
1
16
0,75
16
0,5
16
0,5
10
Length 2x10 meter
2
AWG
mm
AWG
2
Not recommended
5
35
2
7
16
5
10
16
5
10
10
7
11
6
10
Length 2x10 meter
2
AWG
mm
AWG
2
Not recommended
5
35
2
5
25
3
5
25
3
7
16
5
Length 2x20
meter
2
mm
AWG
Not
recommended
Not
recommended
25
3
25
3
25
3
16
5
Length 2x20
meter
2
mm
AWG
Not
recommended
Not
recommended
35
2
35
2
35
2
7
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