Installation Guide

Installation
20 900-0168-01-00 Rev C
DC Wiring
WARNING: Shock Hazard
Use caution when working in the vicinity of the inverter’s battery terminals.
CAUTION: Equipment Damage
Never reverse the polarity of the battery cables. Always ensure correct polarity.
CAUTION: Fire Hazard
 The installer is responsible for providing overcurrent protection. Install a
circuit breaker or overcurrent device on each DC positive (+) conductor to
protect the DC system.
 Never install extra washers or hardware between the mounting surface
and the battery cable lug. The decreased surface area can build up heat.
See the hardware diagram on page 21.
IMPORTANT:
 The DC terminals must be encased in an enclosure to meet the requirements
of some local or national codes.
 Table 5 contains OutBack’s recommendations for minimum safe cable sizes.
Other codes may supersede OutBack’s recommendations. Consult applicable
codes for final size requirements.
Table 5 DC Conductor Size and Torque Requirements
Inverter
(Wattage/Voltage)
Nominal DC Amps
(Derated 125%)
Conductor Size
3
(Minimum)
Breaker Size
(Minimum)
FXR2012E 200 120 mm (4/0 AWG) or 0.186 in 250 Adc
VFXR2612E 260 120 mm (4/0 AWG) or 0.186 in 250 Adc
FXR2024E 100 70 mm (2/0 AWG) or 0.109 in 175 Adc
VFXR3024E 150 120 mm (4/0 AWG) or 0.186 in 250 Adc
FXR2348E 57.5 70 mm (1/0 AWG) or 0.109 in 125 Adc
VFXR3048E 75 70 mm (1/0 AWG) or 0.109 in 125 Adc
Terminal Location Torque Requirements
Inverter DC Terminals 6.9 Nm (60 in-lb)
Battery Terminals See battery manufacturer’s recommendations
When installing DC cables:

Battery positive and negative cables should be no longer than 3 meters (10 feet) each, to minimize voltage
loss and other possible effects.

Turn off DC circuit breakers or remove fuses before proceeding.

Tie, tape, or twist cables together to reduce self-inductance. Run positive and negative cables through the
same knockouts and conduit.

The inverter’s battery terminal is a threaded stud which accepts a ring terminal lug. Use crimped and sealed
copper ring lugs with 0.79 cm (5/16 inch) holes, or use compression lugs.

Install all overcurrent devices on the positive cable.
3
Cable sizes are for each inverter in a system. In a system with multiple inverters, each inverter requires its own cables and overcurrent
devices of the size indicated.