Outback FX-R Series Installation Manual

Installation
20 900-0166-01-01 Rev A
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 Nominal DC Amps
(Minimum, per breaker) (Derated 125%)
Conductor Size
2
(Minimum)
Breaker Size
(Minimum)
FXR2012A 200 4/0 AWG (120 mm²) or 0.186 in² 250 Adc
VFXR2812A 280 4/0 AWG (120 mm²) or 0.186 in² 250 Adc
FXR2524A 125 2/0 AWG (70 mm²) or 0.109 in² 175 Adc
VFXR3524A 175 4/0 AWG (120 mm²) or 0.186 in² 250 Adc
FXR3048A 75 1/0 AWG (70 mm²) or 0.109 in² 125 Adc
VFXR3648A 90 1/0 AWG (70 mm²) or 0.109 in² 125 Adc
Terminal Location Torque Requirements
Inverter DC Terminals 60 in-lb (6.9 Nm)
Battery Terminals See battery manufacturer’s recommendations
When installing DC cables:

Battery positive (+) and negative (–) cables should be no longer than 10 feet (3 meters) each. This helps
to minimize voltage loss and other possible effects.

Turn off DC circuit breakers 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 5/16 inch (0.79 cm) holes, or use compression lugs.

Install all overcurrent devices on the positive cable.
2
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.