Outback Power GS4048A and GS8048A QuickStart Guide
Installation
900-0162-01-00 Rev A.vsd\Page-2\2014-01-24
©2014 OutBack Power Technologies. All Rights Reserved.
RADIAN Series
16" (40.6 cm)
Plywood (Optional)
Wall Board
Wall 
Stud
Wall Bracket
Wall 
Stud
4.1" 
(10.4 cm)
5.0" 
(12.7 cm)
6.0" 
(15.2 cm)
8.0" 
(20.3 cm)
AC Circuit Breakers
1
GFDI
2
3
4
DC Terminals - Inverter
AC Terminals - Inverter
5
DC Circuit Breakers
6
PV Circuit Breakers
Charge Controller Terminals
7
8
Mechanical Interlock (Bypass)
9
10
Communication Ports
Auxiliary Terminals
11
12
13
14
15
AC OUT Bus Bar L1
16
17
18
19
AC OUT Bus Bar L2
GRID IN Bus Bar L1
GRID IN Bus Bar L2
GEN IN Bus Bar L1
GEN IN Bus Bar L2
AC Neutral
Ground
20
DC Positive (+) Plate (not used 
on GSLC175PV1-120/240)
PV Negative (–) Terminals
21
22
PV Positive (+) Bus Bars
DC Negative (–) Plate (GS-SBUS)
N
E
U
L1 L2
GRID
L1 L2
GEN
N
E
U
N
E
U
L1 L2
OUT
RELAY
AUX
+ -
12V 
AUX
Switch
INV
Remote
Battery 
Temp
FM80 #1 FM80 #2
MATE3
HUB 
10.3
GS8048A
GSLC175-PV-120/240
1
2 2
3
4
5
7
8
8
9
9
9
9
9
10
10
10
6
ON/OFF
INV
11
12
13
14
15
16
17
18
19
20
21
21
22
20
AC Wire Sizes and Torque Values
OutBack recommends that conductors be 
#6 AWG THHN copper, or larger, rated to 75°C 
(minimum) unless local code requires otherwise.
AWG In-lb
#14 to #10 20
#8 25
#6 to #4 35
#3 35
#2 40
#1 50
1/0 50
mm
2
2.5 to 6
10
16 to 25
35
35
50
70
Nm
2.3
2.8
4.0
4.0
4.5
5.6
5.6
Wire Size Torque
Torque Requirements
Plywood 
(Optional)
Wall Board
Wall 
Bracket
Wall Stud
N
E
U
L1 L2
GRID
L1 L2
GEN
N
E
U
N
E
U
L1 L2
OUT
RELAY
AUX
+ -
12V 
AUX
Switch
INV
Remote
Batter y 
Temp
ON/OFF
INV
28.0" 
(71.1 cm)
16" (40.6 cm)
0.5" (1.3 cm)0.5" (1.3 cm)
29.1" 
(74.0 cm)
45.0" 
(114.3 
cm)
13.7" 
(34.8 cm)
Inverter 
Bracket
8.75" 
(22 cm)
Circuit Breaker 
Stud
Torque
In-lb Nm
M8 20 2.3
¼ - 20 35 4.0
5/16 - 18 50 5.6
3/8 - 16 225 25.4
DC Plates
Torque
In-lb Nm
Upper holes (+)
Shunt Bolts (–) 
and GS-SBUS
Lower holes (+)
60
6.8
5.6
6.8
60
50
60
Minimum DC Cable based on 
the DC Circuit Breaker
Torque
In-lb Nm
50 5.6
225 25.4
225 25.4
Circuit 
Breaker
Cable Size
125 1/0 (70 mm
2
)
175 2/0 (70 mm
2
)
250 4/0 (120 mm
2
)
35 4.080 #4 AWG (25 mm
2
)
35 4.060 #6 AWG (16 mm
2
)
Positive Battery Cable Connections
CAUTION: 
Equipment Damage 
When connecting cables 
from the Radian inverter 
to the battery terminals, 
make sure to observe 
the proper polarity. 
Connecting the cables 
incorrectly can damage 
or destroy the equipment 
and void the product 
warranty.
Ensure the mounting surface is strong enough to handle 3 times the total weight of all the components. Add plywood or other 
reinforcing material as necessary to strengthen the surface.
Attach the wall bracket. Center the mounting holes on the wall studs. Use all 6 mounting screws to secure the bracket.
Lift the inverter so that the inverter bracket is above the wall bracket.
Lower the inverter so that the inverter bracket slips into the wall bracket. 
If GSLC is not used:  Secure the inverter to the surface using a minimum of 1 wall screw (or appropriate hardware). 
If GSLC is used: Unscrew the inverter bottom screws approximately ¼” (0.6 cm) to 3/16" (0.5 cm).
Align the GSLC along the bottom of the inverter.  Slide the bottom screws into the keyhole slots.
Mark the spots for the GSLC mounting feet.  (If necessary, remove the GSLC to install wall anchors.) Install screws to secure the feet. 
Follow the appropriate instructions for installing other components. Different mounting locations are available.
1
3
4
2
5
6
7
8
9
Keyhole Slots
1
2
3
4
5
6
7
The FLEXmax charge 
controller is mounted 
with the FW-CCB bracket. 
The FW-CCB2 allows two 
controllers side by side (using 
the forward holes to allow for 
conduit.)
The Radian has two sets of 
bracket positions. The GSLC 
has one set.
NOTE: The FLEXmax 
Extreme charge controller 
attaches directly to the wall, 
not the Radian system. 
It does not use 
OutBack brackets.
14.0" 
(35.6 cm)
12.0" 
(31.8 cm)
8
9
FN-DC
The Radian allows two locations 
for the MATE3 mounting bracket 
(FW-MB3). 
The Radian has one 
mounting location for the 
HUB product. The GSLC 
also has one location. 
Left Side:
Right Side:
For GSLC door 
clearance, space 
systems 0.9" 
(3.2 cm) apart. 
When 
stacking 
multiple 
inverters:
N
E
U
L1 L2
GRID
L1 L2
GEN
N
E
U
N
E
U
L1 L2
OUT
1
Wiring to AC terminals is 
displayed on the Wiring page.
FN-DC wiring is displayed 
on the Wiring page.
Bottom 
Screws
19
Negative Battery Cable 
Connections 
Green
> 90% (blinks if charge parameters 
are met)
Color
Red
Yellow
Yellow
Yellow ≥ 80%
≥ 70% 
≥ 60% 
≥ 60% off, < 60% solid, < 50% blinks
Battery State of Charge
FN-DC LED Indicators
Bolt 3/8"
DC 
Positive 
(+) Plate
Battery 
Positive 
(+) Lug
Flat 
Washer
Nut
Lock 
Washer
Flat 
Washer
Shunt
Bolt 3/8"
Lock 
Washer
Flat 
Washer
Battery 
Negative 
(–) Lug
DC 
Negative (-) 
Plate 
(GS-SBUS)
GSLC175-PV-120/240 GSLC175PV1-120/240
DC Disconnect 
Stud
Battery 
Positive 
(+) Lug
FM80 
Positive (+) 
Terminal
Flat 
Washer
Nut
Lock 
Washer
FN-DC 
Positive (+) 
Sense 
Terminal
4
22
20
20
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