Appendices
Appendices
ProStar MPPT Operator’s Manual
79
78
*Wires sizes larger than 2 AWG (35 mm
2
) must be terminated at a splicer
block located outside of the ProStar MPPT wiring box. Use 2 AWG
(35 mm
2
) or smaller wire to connect to the ProStar MPPT to the splicer
block.
Notes:
• The specified wire length is for a pair of conductors
from the solar or battery source to the controller (1-way
distance)
• For 24 volt systems, multiply the 1-way length in the table
by 2.
• Shaded cells in the table indicate that the current exceeds
the ampacity of the wire for a given ambient temperature
as defined in the following table:
Wire Ampacity** Key
Exceeds wire ampacity at 60°C ambient temperature
Exceeds wire ampacity at 50°C ambient temperature
Exceeds wire ampacity at 40°C ambient temperature
Exceeds wire ampacity at 30°C ambient temperature
**Ampacity for not more than three
current-carrying conductors in a raceway,
cable, or earth (buried) - Per 2011 NEC
2% Voltage Drop Charts for 90°C Stranded Copper Wire
1-Way Wire Distance (feet), 12 Volt System
Wire Size
(AWG)
40A
35A
30A
25A
20A
15A
10A
5A
2/0 *
33.6
38.4
44.8
53.8
67.2
89.6
134.4 268.9
1/0 *
26.6
30.4
35.5
42.6
53.3
71.0
106.6 213.1
2
16.8
19.1
22.3
26.8
33.5
44.7
67.0
134.0
4
10.6
12.1
14.1
16.9
21.1
28.1
42.2
84.4
6
6.6
7.6
8.8
10.6
13.2
17.7
26.5
53.0
8
4.2
4.8
5.6
6.7
8.4
11.1
16.7
33.4
10
2.6
3.0
3.5
4.2
5.2
7.0
10.5
21.0
12
1.6
1.9
2.2
2.6
3.3
4.4
6.6
13.1
14
1.0
1.2
1.4
1.7
2.1
2.8
4.1
8.3
Table C-5. Maximum 1-way wire distance for 12 Volt systems, stranded
copper, 2% voltage drop
1-Way Wire Distance (meters), 12 Volt System
Wire Size
(mm
2
)
40A
35A
30A
25A
20A
15A
10A
5A
70 *
10.24 11.71 13.66 16.39 20.49 27.32
40.98 81.95
50 *
8.12
9.28
10.83 12.99 16.24 21.65
32.48 64.96
35
5.11
5.84
6.81
8.17
10.21 13.62 20.42 40.85
25
3.22
3.68
4.29
5.15
6.43
8.58
12.87 25.73
16
2.02
2.31
2.69
3.23
4.04
5.38
8.07
16.14
10
1.27
1.46
1.70
2.04
2.55
3.40
5.09
10.19
6
0.80
0.91
1.07
1.28
1.60
2.13
3.20
6.39
4
0.50
0.57
0.67
0.80
1.00
1.33
2.00
4.00
2.5
0.32
0.36
0.42
0.50
0.63
0.84
1.26
2.52
Table C-6. Maximum 1-way wire distance for 12 Volt systems, stranded
copper, 2% voltage drop
