Installation
900-0113-01-00 Rev A 19
DC Wiring CAUTION: Equipment Damage
Never reverse the polarity of the battery cables. Always use correct polarity.
CAUTION: Fire Hazard
Always install a breaker, fuse, or protective device to protect the DC system.
Table 4 DC Conductor Size and Torque Requirements
Inverter Nominal DC Amps
(Derated 125%)
Conductor Size
(Minimum)
Breaker Size
GFX1312 130 2/0 AWG or 0.105 in2 (70 mm2) 175 Adc
GFX1424 70 1/0 AWG or 0.083 in2 (70 mm2) 125 Adc
GFX1548 37.5 #1 AWG or 0.066 in2 (50 mm2) 100 Adc
Terminal Location Torque Requirements
Inverter DC Terminals 35 in-lb (4.0 Nm)
Battery Terminals See battery manufacturer’s recommendations
When installing DC cables:
Note minimum sizes in Table 4, but refer to local codes for absolute cable size recommendations.
Battery positive and negative cables should be no longer than 10 feet (3 meters) each, to minimize voltage
loss and other effects.
Always install breakers or fuses on the positive cable.
The cables listed above are for each inverter in a system. In a system with multiple inverters, each inverter
requires its own cables and breakers of the size indicated.
The inverter’s battery terminal is a threaded stud which accepts a ring terminal lug. Use crimped and sealed
copper ring lugs with 5/16 in (0.79 cm) holes, or use compression lugs.
Tie, tape, or twist cables together to reduce self-inductance. Run positive and negative cables through the
same knockouts and conduit.
Make certain the DC breaker is turned to the off position, or the fuse is removed, before proceeding.
If present, remove the battery
terminal covers. These are made of
stiff plastic with a snap-on design.
Remove carefully using a flat
screwdriver inserted into the slots
on the sides of each cover.
Figure 8 Battery Terminal Covers