Outback Power Systems FLEXmax Extreme Owners Manual - Manual (Page 15)

Installation
900-0150-01-00 Rev A 13
 The largest PV array must have a rated short-circuit current of 64 amps or less under STC (Standard
Test Conditions). The output current limit of the FLEXmax Extreme is 80 amps.
 DC battery overcurrent protection must be used as part of the installation. OutBack offers both circuit
breakers and fuses for overcurrent protection.
Physical Requirements and Conduit
IMPORTANT:
Conduit hubs must connect to the conduit before connecting to the FLEXmax Extreme.
WARNING: Burn Hazard
The heat sink can become hot when the charge controller is operating. Use caution
when touching it during operation.
 All wire lugs and ground terminals are to be tightened to a torque value of 4 Nm (35 in-lb).
 Use copper wiring only. Wiring must be rated at 90°C or higher.
 If installing in a wet location, any conduit hubs must comply with the requirements of UL 514B.
 Run positive and negative cables side by side.
~ Tie or twist cables together as much as possible to allow the inductive currents to cancel.
~ Ensure paired cables pass through the same knockout and conduit fittings.
PV and Battery Terminals
WARNING: Shock Hazard
When a PV array is exposed to light, it immediately generates a voltage. Make sure all
DC circuit breakers are OFF (open) BEFORE making any wiring connections. Open both
the battery disconnect devices and the array disconnect devices to ensure isolation of
the controller. Use a DVM to check for voltage on all wires.
CAUTION: Equipment Damage
Each FLEXmax Extreme requires its own PV array. DO NOT PARALLEL PV+ and PV-
TERMINALS OF MULTIPLE CONTROLLERS ON THE SAME ARRAY!
The negative (-) PV and negative (-) BAT terminals are connected internally. Only one wire is needed to connect
to the negative (-) wire lugs if the negative (-) PV and BAT conductors are bonded at the negative bus bar.
See Figure 8, Figure 10, Figure 16 , and Figure 17 for sample wiring diagrams.
Figure 7 Wiring Compartment
DC TERMINALS
PV + PV - BAT - BAT +
DC
Terminals Ground
Bus