©2000 Xantrex Technology Inc.
Minimum Recommended Wire Size
The minimum recommended wire gauge is #8 AWG (for C35 and C40) with
a 75 °C insulation rating and #6 AWG, 90 °C wire for the C60. The terminals on
the C-Series will accept up to #2 AWG (33.6 mm
2
) copper or aluminum wire,
however, UL specifications only allow the use of up to #6 AWG (13.3 mm
2
)
maximum. No crimp-on terminals or lugs are required.
Each model of the CSeries controller is rated for a maximum continuous
current of 35, 40 or 60 amps. Since PV outputs can vary due to the array size
or sunlight striking it, the safe minimum wire size should be based on the
maximum current ratings. The NEC requires conductors and over-current
devices be operated at no more than 80% of their rating. Refer to Table 3
below for a listing of the minimum wire size to use for each model.
R
E
L
L
O
R
T
N
O
C
E
Z
I
S
E
R
I
W
M
U
M
I
N
I
M
E
C
I
V
E
D
T
N
E
R
R
U
C
-
R
E
V
O
G
N
I
T
A
R
5
3
C
G
W
A
8
#
s
p
m
a
5
4
0
4
C
G
W
A
8
#
s
p
m
a
0
5
*
0
6
C
)
e
r
i
w
C
°
0
9
(
G
W
A
6
#
)
y
t
u
d
%
0
0
1
d
e
t
s
il
(
s
p
m
a
0
6
*
*
0
6
C
)
e
r
i
w
C
°
5
7
(
G
W
A
4
#
)
y
t
u
d
%
0
0
1
d
e
t
s
il
(
s
p
m
a
0
6
Table 3
Minimum Wire Size
NOTE: *To meet UL requirements, use #6 AWG, 90 °C wire and a 60 amp LISTED
100% DUTY over-current device for the C60 controller.
** Not approved by UL for direct connection into the controller. Use a splicer
block as specified below and #6 AWG (90 °C wire) to connect to the
controller terminals.
If there is a significant distance between the PV array and the controller
and/or the controller and the battery, larger wires can be used to reduce the
voltage drop and improve performance. Refer to Table 4.
To use a larger size wire, use a splicer block (terminal block) intended for
this purpose. This allows the larger cable size from the batteries to be
spliced to the smaller wire size connected to the controller. Split-bolt kerneys
can also be used for wire splices. Follow manufactures recommendations for
torque and mounting (if required). Splicer blocks and split-bolt kerneys are
available from alternative energy suppliers.
13
3.0 INSTALLATION
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