Outback Power Systems FLEXmax 80 Owners Manual - Manual (Page 12)

Installation
10 900-0009-01-00 Rev C
Wiring
This section provides instructions on installing PV array wiring into the FLEXmax controller. See
page 98 for more notes on PV array sizing and operation.
Wire and Disconnect Sizing
IMPORTANT:
 Wire sizes must comply with local and national codes. Input conductors and circuit
breakers must be rated at 1.56 times the short-circuit current of the PV array (per
NEC). OutBack 100% duty continuous circuit breakers only need to be rated at 1.25
times the short-circuit current.
 Copper wiring must be rated at 75°C or higher.
 Use up to 2 AWG (33.6 mm
2 ) to reduce losses and ensure high performance of the
FLEXmax (smaller cables can reduce performance and possibly damage the unit).
FLEXmax 80
 The output current limit of the FLEXmax 80 is 80 amps.
 Install OutBack PNL-80-DC circuit breakers for disconnect and overcurrent protection
 Use a minimum of #4 AWG (25 mm 2 ) wire for the output between the FLEXmax 80 and the battery bus bar
conductors.
 The largest PV array must have a rated short-circuit current of 64 amps or less under STC (Standard
Test Conditions).
 Torque all the FLEXmax wire lugs and ground terminals to 4 Nm (35 in-lb).
FLEXmax 60
 The output current limit of the FLEXmax 60 is 60 amps.
 Install OutBack PNL-60-AC/DC or PNL-80-DC circuit breakers for disconnect and overcurrent protection.
 Use a minimum of #6 AWG (16 mm 2 ) wire for the output between the FLEXmax 60 and the battery bus bar
conductors.
 The largest PV array must have a rated short-circuit current of 48 amps or less under STC (Standard
Test Conditions).
 Torque all the FLEXmax wire lugs and ground terminals to 4 Nm (35 in-lb).
Please refer to the NEC and other electrical codes for recommendations on PV array cable sizing and
recommended length and ampacity.