User manual
66
Specifi cations
2% Voltage Drop Charts for 90°C Stranded Copper Wire
1-Way Wire Distance (feet), 12 Volt System
Wire Size
(AWG)
60
Amps
55
Amps
50
Amps
45
Amps
40
Amps
35
Amps
30
Amps
25
Amps
20
Amps
15
Amps
2/0 ** 22.4 24.4 26.9 29.9 33.6 38.4 44.8 53.8 67.2 89.6
1/0 ** 17.8 19.4 21.3 23.7 26.6 30.4 35.5 42.6 53.3 71.0
2 11.2 12.2 13.4 14.9 16.8 19.1 22.3 26.8 33.5 44.7
4 7.0 7.7 8.4 9.4 10.6 12.1 14.1 16.9 21.1 28.1
6 4.4 4.8 5.3 5.9 6.6 7.6 8.8 10.6 13.2 17.7
8 2.8 3.0 3.3 3.7 4.2 4.8 5.6 6.7 8.4 11.1
10 1.7 1.9 2.1 2.3 2.6 3.0 3.5 4.2 5.2 7.0
12 1.1 1.2 1.3 1.5 1.6 1.9 2.2 2.6 3.3 4.4
14 0.7 0.8 0.8 0.9 1.0 1.2 1.4 1.7 2.1 2.8
Table 8-5. 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
)
60
Amps
55
Amps
50
Amps
45
Amps
40
Amps
35
Amps
30
Amps
25
Amps
20
Amps
15
Amps
70 ** 6.83 7.45 8.20 9.11 10.24 11.71 13.66 16.39 20.49 27.32
50 ** 5.41 5.91 6.50 7.22 8.12 9.28 10.83 12.99 16.24 21.65
35 3.40 3.71 4.08 4.54 5.11 5.84 6.81 8.17 10.21 13.62
25 2.14 2.34 2.57 2.86 3.22 3.68 4.29 5.15 6.43 8.58
16 1.35 1.47 1.61 1.79 2.02 2.31 2.69 3.23 4.04 5.38
10 0.85 0.93 1.02 1.13 1.27 1.46 1.70 2.04 2.55 3.40
6 0.53 0.58 0.64 0.71 0.80 0.91 1.07 1.28 1.60 2.13
4 0.33 0.36 0.40 0.44 0.50 0.57 0.67 0.80 1.00 1.33
2.5 0.21 0.23 0.25 0.28 0.32 0.36 0.42 0.50 0.63 0.84
Table 8-6. Maximum 1-way wire distance for 12 Volt systems, stranded copper, 2% voltage drop
** Wires sizes larger than 2 AWG (35 mm
2
) must be terminated at a splicer block located outside of the TriStar MPPT wiring box.
Use 2 AWG (35 mm
2
) or smaller wire to connect to the TriStar MPPT to the splicer block.
Notes:
• The specifi ed 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.
• For 48 volt systems, multiply the 1-way length in the table by 4.
• Shaded cells in the table indicate that the current exceeds the ampacity of the wire for a
given ambient temperature as defi ned 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-car-
rying conductors in a raceway, cable, or earth
(buried).