78
29. Wire Distance Chart
To meet NEC compliance (North America), the largest PV array that can be connected to a FLEXmax 80
must have a rated short-circuit current of 64 amps or less and 48 amps or less for a FLEXmax 60. The
following charts show the maximum distance of various gauge two-conductor copper wire from the
PV array to the Charge Controller with a 1.5% maximum voltage drop. Temperature and conduit ll cor-
rections may be required. Using a higher voltage PV array with a low voltage battery system allows you
to use a much smaller wire size or go up to 5 times as far with the same gauge wire.
FLEXmax 60 and FLEXmax 80 (The gures below assume THWN 75
0
C two-conductor copper wire
and allow for a 1.5% voltage drop)
12V PV ARRAY (16v Vmp)
#8 #6 #4 #3 #2 #1 #1/0 #2/0 #3/0 #4/0
10 15 24 39 49 62 78 98 124 157 197
20 8 12 19 24 31 39 49 62 78 99
30 5 8 13 16 21 26 33 41 52 66
40 4 6 10 12 15 19 25 31 39 49
50 3 5 8 10 12 16 20 25 31 39
60 3 4 6 8 10 13 16 21 26 33
70 2 3 6 7 9 11 14 18 22 28
80 2 3 5 6 8 10 12 16 20 25
24V PV ARRAY (32v Vmp)
#8 #6 #4 #3 #2 #1 #1/0 #2/0 #3/0 #4/0
10 31 49 78 98 124 156 197 248 313 395
20 15 24 39 49 62 78 98 124 157 197
30 10 16 26 33 41 52 66 83 104 132
40 8 12 19 24 31 39 49 62 78 99
50 6 10 16 20 25 31 39 50 63 79
60 5 8 13 16 21 26 33 41 52 66
70 4 7 11 14 18 22 28 35 45 56
80 4 6 10 12 15 19 25 31 39 49
36V PV ARRAY (48v Vmp)
#8 #6 #4 #3 #2 #1 #1/0 #2/0 #3/0 #4/0
10 46 73 117 147 186 234 295 372 470 592
20 23 37 58 73 93 117 148 186 235 296
30 15 24 39 49 62 78 98 124 157 197
40 12 18 29 37 46 58 74 93 117 148
50 9 15 23 29 37 47 59 74 94 118
60 8 12 19 24 31 39 49 62 78 99
70 7 10 17 21 27 33 42 53 67 85
80 6 9 15 18 23 29 37 47 59 74
METRIC
#8…8.37mm
2
#6…13.30mm
2
#4…21.15mm
2
#3…26.7mm
2
#2…33.6mm
2
#1/0…53.5mm
2
#2/0…67.4mm
2
#4/0…107mm
2
WIRE GAUGE
AMPS
WIRE GAUGE
AMPS
WIRE GAUGE
AMPS
NOTE: Numbers in bold might not meet NEC requirements
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