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TriStar MPPT Voltage Drop Tables
Good system design generally requires large conductor wires that limit voltage drop losses to 2% or
less. The tables below provide wire sizing for a maximum of 2% voltage drop. Longer distance wire
runs may require significantly larger wire sizes to reduce the voltage drop to an acceptable level.
2% Voltage Drop Chart for 75°C or 90ºC Stranded Copper Wire (Feet), 12 Volt System
Maximum 1-way Distance (feet), 12 Volt System - multiply values by (2) for 24 Volt and by (4) for 48V,
System.
Wire
Size
60A
55A
50A
(AWG)
4/0
39.2
42.8
47.0
52.3
1
3/0
31.1
33.9
37.3
41.5
1
2/0
24.6
26.9
29.6
32.9
1
1/0
19.5
21.3
23.4
26.0
#1
15.5
16.9
18.6
20.6
#2
12.3
13.4
14.7
16.4
#3
9.7
10.6
11.7
13.0
#4
7.7
8.4
9.3
10.3
#6
4.9
5.3
5.8
6.5
#8
3.1
3.3
3.7
4.1
#10
#12
#14
Wires sizes larger than #2 AWG (35 mm
1
external to the TriStar MPPT. Use #2 AWG (35 mm
MPPT to a splicer block.
Table A-3. Maximum 1-way wire distance for 12 Volt systems, stranded copper, 2% voltage drop
72
45A
40A
35A
30A
25A
20A
15A
58.8
67.2
78.4
94.1
117.6
156.8
46.7
53.3
62.2
74.7
93.3
124.5
37.0
42.3
49.3
59.2
73.9
98.6
29.3
33.5
39.1
46.9
58.6
78.1
23.2
26.5
31.0
37.1
46.4
61.9
18.4
21.1
24.6
29.5
36.9
49.1
14.6
16.7
19.5
23.3
29.2
38.9
11.6
13.3
15.5
18.6
23.2
31.0
7.3
8.3
9.7
11.6
14.6
19.4
4.6
5.3
6.1
7.4
9.2
12.3
2.9
3.3
3.8
4.6
5.8
7.7
2.9
3.6
4.8
2.3
3.0
2
) must be terminated at a splicer block located
) or smaller wire to connect to the TriStar
2
Specifications
2% Voltage Drop Chart for 75°C or 90ºC Stranded Copper Wire (meters), 12 Volt System
Maximum 1-way Distance (meters), 12 Volt System - multiply values by (2) for 24 Volt and by (4) for
48V, System.
Wire
60A
55A
50A
Size
(mm
)
2
12.7
13.9
15.3
17.0
120
1
10.1
11.0
12.1
13.5
95
1
70
1
7.3
8.0
8.8
50
5.1
5.5
6.1
35
3.8
4.1
4.5
25
2.7
3.0
3.3
16
1.7
1.9
2.1
10
1.3
6
4
2.5
Wires sizes larger than 35 mm
1
2
external to the TriStar MPPT. Use 35 mm
MPPT to a splicer block.
Table A-4. Maximum 1-way wire distance for 12 Volt systems, stranded copper, 2% voltage drop
TriStar MPPT Operator's Manual
45A
40A
35A
30A
25A
20A
15A
19.1
21.8
25.5
30.6
38.2
51.0
15.2
17.4
20.2
24.3
30.4
40.5
9.8
11.0
12.6
14.7
17.6
22.0
29.4
6.8
7.6
8.7
10.2
12.2
15.3
20.3
5.0
5.6
6.4
7.5
9.0
11.3
15.0
3.6
4.1
4.6
5.4
6.5
8.1
10.8
2.3
2.6
2.9
3.4
4.1
5.2
1.4
1.6
1.8
2.2
2.6
3.2
4.3
1.3
1.5
1.9
2.6
1.0
1.3
1.7
0.8
1.1
must be terminated at a splicer block located
2
or smaller wire to connect to the TriStar
6.9
73
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