Installation Guide
Additional Information
900-0254-01-00 REV A
©2019 OutBack Power. All Rights Reserved.
FLEXmax 100
Quick Start Guide
Mounting
o The FLEXmax 100 must be mounted upright at least 36" (91.4 cm) above the
ground or floor. Shade is recommended when installing outdoors.
o Conduit hubs must be connected to the conduit before connecting to the
FLEXmax 100.
o Conduit should be 1" size (1⅜” actual diameter).
o Clearance requirements are a minimum of 6" (15.2 cm) above and below the controller.
o The unit can be mounted using either brackets (see steps 1 through 4 in A) or
keyhole slots (see steps 1 and 2 in B) on a secure mounting surface. Follow the
numbered steps.
Included in Package
o FLEXmax 100 Charge Controller
o 2 x Mounting Bracket
o Silicone Grease Package
o Cooling Fan (outdoor-rated)
o MicroSD Card (already installed)
NOTES:
Unit output is derated above 25°C (77°F)
Terminals
1
2 3 4
5 6
7 8
IMPORTANT:
Not intended for use with
life support equipment.
Symbol Indicator Pattern Controller Status Voltage
Off = less than 10 W PV available Battery rest
Bulk, Equalize, or GT Mode
Absorption
Float Float
Bulk or Absorption 1.91 Vpc
GT Mode
Battery Discharge < 1.91 Vpc
Critical Battery Discharge < 1.75 Vpc
Equalize EQ
AUX Active
Ground Fault Shutdown or other fault
Arc Fault Shutdown
Charging
Status
Auxiliary
Fault
LED Indicators and FLEXmax 100 Symbols
(See A in wiring section)
All flash twice, then turn off (with PV power available) = Rapid Shutdown
Terminal Functions
o 1 through 4: Rapid Shutdown terminals.
Terminals 1 and 3 connect to normally-closed
contacts on the RSI (Rapid Shutdown Initiator),
which is part of the OutBack ICS Plus system.
NOTE: A factory-installed jumper wire
connects these terminals. It may need to be
removed before installing a rapid shutdown.
Otherwise it should be left in place. If the
terminals are left open, the controller shuts down.
Terminals 2 and 4 are parallel connections.
They can connect to additional FLEXmax 100
controllers to perform the same function with a
single RSI.
o 5 and 6: Auxiliary (A
UX) terminals.
Used for diversion control and other functions.
o 7 and 8: Battery Sense terminals.
See Wiring section.
Date and Revision
June 2019, Revision A
Environmental / Safety Specifications
Float
Dimensions
Height: 23.0" (58.4 cm)
Width: 8.8" (22.4 cm)
Depth to Wall: 6.0" (15.2 cm)
Bracket hole spacing: 5.13” (13.0 mm)
Vertical space between upper and lower bracket holes:
Approximately 20" when mounted
A
¼” hex
head lag
screws
1
2
4
3
B
Keyhole Slots
(#14 slotted wood screws,
7.9" or 20.1 cm spacing)
Securing Holes
(¼” hex head lag screws)
1
2