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INSTALLATION — Part 1
It is best to complete installation Part 1 BEFORE installing Enphase
microinverters, IQ Battery 5P , and/or IQ System Controller.
1
Choose a location for the IQ Combiner
A ) Install the IQ Combiner 5/5C in a readily accessible location, at least three
feet (91 cm) off the ground.
B ) Consider the dimensions of the IQ Combiner, easy access, box height, and
length of cable when selecting the location. The IQ Combiner is rainproof
but not watertight.
C ) Mount the IQ Combiner 5/5C on a vertical surface.
NOTE: You must mount the IQ Combiner within 15° of vertical.
2
Install circuit breaker(s)
The combiner includes one two-pole 10 A or 15 A circuit breaker that feeds
the IQ Gateway and an AC outlet (if XA-PLUG-120-3 is present). You can
install additional breakers if needed. You must follow all NEC and local elec-
trical codes.
NOTE: For IQ8 grid-forming systems, this breaker must not be used to
power the IQ Gateway and the procedure described in steps C and D must
be followed. For IQ6/IQ7 and IQ8 grid-tied systems, skip the steps C and
D.
A ) Open the enclosure door. Pinch the top of the hinge rod using a pair of
needle-nosed pliers. Slide the door up and remove it. Set the door aside for
later reattachment.
NOTE: a) Risk of equipment damage. Do not remove the pre-installed heat
shield attached to the enclosure door.
b) Risk of equipment damage. Always unplug the USB cable from the
IQ Gateway USB port prior to removing the deadfront.
B ) Remove the plastic deadfront with the integrated cell modem on the
deadfront. It is not necessary to completely remove the screws.
Warning! Risk of electric shock. To maintain the warranty,
do not modify the dead front other than to remove or replace
filler plates, as needed.
C ) For IQ8 grid-forming systems, connect IQ Gateway L1 and L2 to the 20 A
L1 and L2 terminals, respectively, of the pre-installed quad breaker on the
autotransformer position in the IQ System Control ler 3/3G.
NOTE: The IQ Gateway L2 terminal is shorted to L3 terminal using a
jumper. While powering the L2 of the IQ Gateway, loosen the jumper
from the L2 terminal, insert the wire, and then tighten to ensure both
the wire and jumper are properly installed. Do not loosen the jumper
connection on the L3 terminal.
D ) Remove the filler plate on the deadfront for each breaker position you will
use. To remove the filler plate, press the single latch inward while gently
pushing the filler plate out.
E ) Snap the breaker onto the busbar, using only the breaker positions indicat-
ed in the diagram on the door of the unit.
Drill holes to accept conduit
3
A ) The bottom and sides of the IQ Combiner 5/5C are the best locations
to drill holes for conduit fittings. Rear conduit entry below the busbar
assembly is also supported.
Warning! Risk of equipment damage. Do not drill conduit
holes on the top of the box or at any location that allows
moisture ingress.
NOTE: When drilling, consider the internal parts of the combiner. Make
sure that the holes do not interfere with the internal workings, mechan-
ics, or the deadfront legs in the corners of the combiner.
Best practice: Use a stepped drill bit to make the conduit holes. Using a
hole saw may crack the plastic housing. As an alternative, use a sharp
chassis punch with caution.
B ) Use a snap punch or other type of center punch to prevent the drill
from wandering. Drill a pilot hole with a smaller drill before using a step
drill bit.
C ) Use only UL-listed rain-tight conduit fitting for wire entry into the enclo-
sure.
Wire the output connections
4
Warning! Risk of equipment damage. Observe bend radius
requirements when routing wires.
Refer to the diagram on the door of the IQ Combiner 5/5C and do the follow-
ing:
A ) Use conductors sized per local code requirements taking into consid-
eration the voltage drop/rise and upstream breaker or fuse.
B ) The two terminals below the circuit breaker(s) are the output connec-
tions. Install L1 into the left terminal and L2 into the right terminal.
NOTE: IQ Series Microinverters use a two-wire system and do not use a
Neutral. However, the IQ Gateway in the combiner still requires a Neutral
from the load center.
C ) Connect the neutral (white) to the neutral busbar.
D ) Connect the ground (green or green/yellow) to the Ground busbar.
E ) Torque all connections as indicated in the table below.
5
Wire inputs from the AC branch circuits
You can install AC branch circuit breakers up to 80 A total (sum of breaker
ratings, excluding the 10 A/15 A IQ Gateway breaker). With individual branch
circuits, you will typically use up to four 20 A breakers. Refer to the diagram
on the door of the IQ Combiner and do the following:
A ) Use copper conductors sized to meet local code requirements and
voltage drop/rise considerations.
B ) Bring in the wires from each AC branch circuit.
C ) Connect the ground (green or green/yellow) to the ground busbar.
D ) Pass the L1 conductors from each PV branch circuit through the Produc-
tion CT in the same direction as the arrow on the side of the CT.
E ) If you use the fourth (Battery/PV) breaker position for PV, you must route
the L1 conductor through the Production CT.
NOTE: Do not pass conductors from IQ Battery 5P branch circuits through
the Production CT. This will distort production readings.
F ) Connect L1 and L2 (usually one black and one red) from each AC branch
circuit (PV and/or battery) to the circuit breaker(s). Observe the L1 and
L2 polarity marking at each breaker position.
G ) Torque all connections as indicated in the following table.
H) For IQ8 grid-forming installations (i.e., with an IQ System Controller
3/3G), you must install hold-down kits for the breakers for PV branch
circuits as per the NEC code. Refer to the installation instructions of the
hold-down kit for installing the hold-down kit for IQ8 systems.
CONNECTION
DG breaker (1, 2, 3, 4)
60 A circuit breaker only
IQ Gateway breaker
IQ Gateway power terminals
Neutral and Ground
Large screw
Small screw
Main lug
CTRL connectors
CTRL cables (C1, C2)
Drain cables
Copper conductors only, rated min. 75°C. Follow NFPA 70 (NEC), or CSA C22.1 part
1, and all local codes. For DG breakers larger than 20 A, use wire insulated for 90°C
based on 75°C ampacities.
WIRE SIZES
TORQUE
14-10 AWG
2.2 N m (20 lb-in)
8 AWG
2.8 N m (25 lb-in)
6-4 AWG
3.0 N m (27 lb-in)
4-1/0 AWG
5.0 N m (45 lb-in)
14-10 AWG
2.26 N m (20 lb-in)
14-10 AWG
1.4 N m (12.4 lb-in)
2-1/0 AWG
5.6 N m (50 lb-in)
14-3 AWG
5.1 N m (45 lb-in)
6 AWG
3.6 N m (32 lb-in)
8 AWG
2.6 N m (23 lb-in)
10-14 AWG
2.3 N m (20 lb-in)
10-4 AWG
5.0 N m (45 lb-in)
3-2/0 AWG
5.6 N m (50 lb-in)
18 AWG
0.2 N m (1.77 lb-in)
18 AWG
0.2 N m (1.77 lb-in)
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