Installation and Operation Manual (Rev B)
20
90°C copper conductors must be used for wiring. The inverter terminals are listed for 75
o
C wire;
see NEC 310.10 or the Canadian Electrical Code regarding temperature ratings of wire and
terminals. Temperature derating factors, voltage drop and other considerations may dictate that
larger than minimum wire sizes be used. Verify that any wire size choices meet local codes.
Table 5.1 Wire Sizes Associated with Integrated Fused PV Combiner
Using only one or two inputs are not recommended for best current sharing results. If needed,
DC input wires can be connected to the inverter as showed in table 5.2 below.
Warning:
DC fuses must be removed
before any of the configurations in table 5.2 are
allowed.
Warning:
Fusing at the combiner box prior of the connecting to the inverter is required
for all of the connections in table 5.2
DC wiring
connection point
Configuration
Max DC Wire Size
Conductors
Torque
(ALL)
DC terminal block
4-8 inputs
Standard use of integrated
string combiner box and
input fusing
10 AWG, 90°C Cu
10 in-lb
String combiner
box bypass
terminals, 2 inputs
Two standard inputs that
bypass integrated string
combiner box and use
separate MPPT channels
8 AWG, 90°C Cu
(Not recommended,
see details below)
10 in-lb
String combiner
box bypass
terminals, 1 input
Single input that bypasses
string combiner using a
single MPPT channel
4 AWG, 90°C Cu
(Not recommended,
see details below)
10 in-lb
