Victron energy BlueSolar MPPT 150/70 Manuel page 6

Table 1 below gives some examples of battery cable cross sections calculated with formula
(5).
(in this case I and V in formula (5) are the output current and output voltage of the charge
controller)
Maximum
Maximum
Charge
solar array
current
output
@13,4V
500W 37A
750W 55A
1000W 70A 1)
Maximum
Maximum
Charge
solar array
current
output
@26,8V
500W 18A
1000W 37A
2000W 70A 1)
Maximum
Maximum
Charge
solar array
current
output
@40,2V
750W 21
1500W 42
3000W 70A 1)
Maximum
Maximum
Charge
solar array
current
output
@53,6V
1000W 21
2000W 42
4000W 70A 1)
1) Taking into account 6% loss (battery cables + controller + PV cables + fuses)
Table 1: Battery cable cross section and power loss
6
12V system (solar array up to 1000W)
Battery Power loss
Fuse in battery
Rating cablesα (%)
63A 1
80A 1,5
100A 2
24V system (solar array up to 2000W)
Battery Power loss
Fuse in battery
Rating cables α (%)
35A 1
63A 1,5
100A 2
36V system (solar array up to 3000W)
Battery Power loss
Fuse in battery
Rating cables α (%)
35 0,5
63 0,5
100 1
48V system (solar array up to 4000W)
Battery Power loss
Fuse in battery
rating cables α (%)
35 0,5
63 0,5
100 1
Length 2x1,5 m Length 2x2,5 m
2 2
mm AWG mm
25 3 35
25 3 35
25 3 35
Length 2x1,5 m Length 2x2,5 m
2 2
mm AWG mm
6 10 10
6 10 10
10 7 16
Length 2x2,5 m Length 2x5 m
2 2
mm AWG mm
6 10 10
16 5 25
16 5 25
Length 2x2,5 m Length 2x5 m
2 2
mm AWG mm
6 10 10
10 7 16
10 7 16
Length 2x5 m
2
AWG mm AWG
2 Not recommended
2 Not recommended
2 Not recommended
Length 2x5 m
2
AWG mm AWG
7 16 5
7 25 3
5 35 2
Length 2x10 m
2
AWG mm AWG
7 16 5
3 35 2
3 35 2
Length 2x10 m
2
AWG mm AWG
7 16 5
5 35 2
5 35 2