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Install CTs for consumption and battery metering
NOTE: Consumption metering is mandatory for IQ Battery and Sunlight Backup systems. Battery metering is mandatory for battery systems.
The IQ Gateway printed circuit board inside the IQ Combiner 5/5C is pre-wired at the terminal blocks for power and production metering connections. One solid-core
Current Transformer (CT) is provided for revenue-grade production metering. Three clamp-style CTs are provided. Two for consumption metering and one for battery
metering. To install them, create a protected route using conduit for the CT wires from the main load center to the IQ Gateway. If you need to extend the wires, refer
to the IQ Gateway Installation and Operation Manual at:
NOTE: Because of variance in load center design and main power feed, there may not always be enough space to install consumption metering CTs.
A ) Make sure that the main load center wires are de-energized until you
have secured the CT wires in the terminal blocks.
B ) Before running the CT wires through the conduit, use colored tape to
mark one of the CTs and the free end of its wires.
C ) Connect the CT with the red and black wire to the red and black "C1"
terminals.
D ) Connect the CT with the purple and brown wire to the purple and brown
"C2" terminals .
E ) Tighten all connections to 5 in-lbs .
F ) Clamp the red and black C1 CT on the load center feed wire Line 1
(matching the IQ Gateway's "L1" voltage terminal) with the CT arrow
pointing toward the load (away from the grid) .
G ) Clamp the purple and brown C2 CT on the load center feed wire Line
2 (matching the IQ Gateway's "L2" voltage terminal) with the CT arrow
pointing toward the load (away from the grid).
H) If IQ Battery 5P is present, clamp the blue and white C3 CT on the line 2
power wire for all branches of IQ Battery 5P (matching the IQ Gateway's
"L2" voltage terminal) with the CT arrow pointing toward the load (away
from the battery).
Energize and update the IQ Gateway
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A ) Re-install the plastic deadfront with the LTE-M1 cell modem in-
stalled on the deadfront. Do not completely tighten all of the screws.
B ) Once all screws are partially tightened, go back and tighten each
one completely.
C) Plug in Mobile Connect USB cable into an IQ Gateway USB port
D ) Turn off the DG breaker(s).
E ) Reinstall the IQ Combiner door.
F ) Turn on the circuit feeding the combiner.
G ) Log into the Enphase Installer App on your mobile device and down-
load the latest version of IQ Gateway software.
H ) On the IQ Gateway (inside the combiner), if the AP mode LED is not lit,
press the AP mode button.
I ) On your mobile device, go to "Settings" and join the Wi-Fi network "IQ
Gateway_nnnnnn" (where "nnnnnn" equals the final six digits of the IQ
Gateway serial number).
enphase.com/support.
NOTE: It is important to match CT and sense voltage phases.
To properly measure power and energy, CT inputs must align with the
respective voltage inputs. Be sure to consistently identify and match the
two AC lines at two points: the main load center feed and the IQ Gate-
way. Wire colors (typically black and red) may not always consistently
identify Lines 1 and 2. If in doubt, use a multimeter to check.
DANGER! Risk of electric shock. Always de-energize the load
center before beginning wiring.
DANGER! Risk of electrocution and equipment damage! Do
not install CTs when current is flowing in the sensed circuit.
Always install CT wires in the terminal blocks before ener-
gizing the sensed circuit.
J ) Login to the Enphase Installer App on your mobile device and update the
latest version of IQ Gateway software.
K ) For a short period (5-10 minutes), you must keep your mobile device
near the combiner. Follow the on-screen instructions while the
update takes place.
The IQ Gateway software update process may take up to 25 minutes.
During the software update, the LEDs on the IQ Gateway flash green one
at a time from right to left. During this time, the IQ Gateway will reboot
multiple times. All four LEDs flash red when the IQ Gateway reboots.
Once the update is finished and the PV system is installed, the IQ Gate-
way is ready for Installation Part 2.
All four LEDs flash red during boot-up (approximately 3 minutes). When
boot-up is complete, the Device Communications LED
red, indicating that devices are not yet detected.
lights solid
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