- Outback Power Systems, Inc. Battery Charger User Manual

31. WIRING COMPARTMENT

The wiring terminals and compartment of the FLEXmax 80 Charge Controller are fully compliant with

all NEC and UL requirements. The following summary is specic for North American applications where

NEC and UL standards govern installations.

Recommended Conductor and Breaker Sizes for the FLEXmax 80

Output Rating at 80 amps

If the output current of the Flexmax 80 is expected to reach the maximum output level of 80 amps:

• #3 or #2 AWG conductor must be used with an 80 amp breaker (100% continuous duty rated breaker)

• The minimum recommended battery conductor is #3* AWG

• The maximum recommended battery conductor is #2** AWG

* #3 AWG conductor can be installed through the side, back or bottom knockouts

** #2 AWG conductor must be installed on the side or back knockout to meet the specic UL

requirements for wire bending room standards

- 1” conduit knockout is approved for up to three #2 AWG conductors

- For short conduit runs (less than 24”), a higher conduit ll is acceptable* —three #2 AWG wires

Please reference the NEC Appendix “C” in the back of the book. You must refer to the table representing

the type of conduit you will be using to nd the maximum number of conductors allowed within the

conduit you will be using.

Output Rating less than 64 amps

If the output current of the FLEXmax 80 is expected to be less than 64 amps:

• An 80 amp breaker and #4 AWG conductors can be used on the battery side.

• The PV array short circuit current must be less than 48 amps and the #4 conductor will be acceptable

with an 80 amp breaker.

METRIC

#4…21.15mm

#3…26.7mm

#2…33.6mm