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6
Install CTs for Consumption Metering (optional)
The IQ Envoy printed circuit board inside the IQ Combiner 3 is pre-wired at the terminal blocks for power and production metering connections. One solid-core cur-
rent transformer (CT) is provided for revenue grade production metering. You can install two optional split-core CTs to provide consumption metering. To do this,
you must create a protected route using conduit for the CT wires from the main load center to the IQ Envoy. If you need to extend the wires, refer to the Enphase IQ
Envoy 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 ) For the marked CT wires, connect the white and blue wires to the white
and blue "C1" terminals.
D ) For the unmarked CT wires, connect the white and blue wires to the
white and blue "C2" terminals.
E ) Tighten all connections to 5 in-lbs.
F ) Clamp the marked CT on the load center feed wire Line 1 (matching the
Envoy's "L1" voltage terminal) with the CT arrow pointing toward the
load (away from the grid).
G ) Clamp the unmarked CT on the load center feed wire Line 2 (matching
the Envoy's "L2" voltage terminal) with the CT arrow pointing toward
the load (away from the grid).
Load Center
From IQ Combiner
Consumption CTs
The arrows must point
toward the load — away
from the grid.
UP TO 250 Vac.
100A 0.5V
45-66Hz
To Grid
Energize and Update the IQ Envoy
7
A ) Re-install the plastic deadfront. Start all of the screws, but do not
completely tighten them.
B ) Once all screws are partially tightened, go back and tighten each one
completely.
C ) Turn off the DG breaker(s).
D ) Reinstall the IQ Combiner 3 door.
E ) Turn on the circuit feeding the combiner.
F ) On the IQ Envoy (inside the Combiner), if the AP Mode LED is not lit,
press the AP Mode button.
G ) On your mobile device, go to Settings and join the Wi-Fi network "Envoy_
nnnnnn" (where "nnnnnn" equals the final six digits of the Envoy serial
number).
enphase.com/support.
IQ Envoy Terminal Block
CU, 75C, 14AWG MIN
MEAS CAT III
OVC III
N
DANGER! Risk of electric shock. Always de-energize the load
center before beginning wiring.
DANGER! Risk of electrocution! Do not install CTs when cur-
rent is flowing in the sensed circuit. Always install CT wires
in the terminal blocks before energizing the sensed circuit.
Notes: It is important to match CT and sense voltage phases. To proper-
ly 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 Envoy. Wire colors
(typically black and red) may not always consistently identify Lines 1
and 2. If in doubt, use a multimeter to check.
Production | Consumption
P1
L1
L2
H ) The app informs you if the software on the Envoy is not the latest version
by displaying the Envoy Software Update message. If the app displays
this message, follow the on-screen instructions to update the Envoy.
I ) 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 update may take up to 20 minutes. The Envoy reboots several times
during the update and the LEDs light up in varied sequences until the update
is complete.
Once the update is finished and the PV system is installed, the Envoy is
ready for Installation Part 2.
All four LEDs flash amber during boot up (approximately 3 minutes).
When boot up is complete, the Device Communications LED
solid amber, indicating that devices are not yet detected.
Digital Input
C1 C2
1
2
3
4
Ref
Common
Not used
Relay contacts
(if needed)
PD, B300
OVC II
Relay
NO
C
lights
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