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TECHNICAL BRIEF
© 2017 Enphase Energy Inc. All rights reserved. September 2017
1
Meter Installation Checklist
Use the Enphase Installer Toolkit™ and this checklist to verify that the Enphase IQ Envoy™, Enphase IQ+
Combiner™, Enphase IQ Combiner™, Enphase Envoy-S Metered™, or the Enphase AC Combiner™ is
wired and configured correctly. This checklist applies to Enphase PV systems with or without an Enphase
Storage System and guides you in configuring production CT metering and optional consumption CT
metering. This procedure requires Envoy Software 4.5 or later. Update Envoy software using the Installer
Toolkit if necessary. The update may take up to 20 minutes. Refer to https://enphase.com/en-
us/support/getting-started-guide-envoy-software-update for information on updating software.
Before You Begin
• Make sure that any Enphase AC Battery circuits, if installed, are switched OFF.
• Make sure the PV circuit is switched ON.
• Wait five minutes for the PV system to start up and make sure it is producing some power.
• Connect to the Envoy with Installer Toolkit.
Checklist
If any of the following cannot be verified, check the Envoy and CT wiring and return to this checklist.
1. Navigate to the Production Meter screen.
Power Readings on all production lines are positive.
2. Turn OFF all PV breaker(s) and wait one minute.
Power Readings on all production lines are close to zero (you may see +/- 1W).
3. Tap Enable Production Meter and confirm.
Tap Meters in bottom navigation. Green checkmark appears next to Production Meter on Meters
screen.
Continue to the next step if you installed
consumption CTs.
4. On the Meters screen, tap
Consumption Meter.
5. Select Load with solar production (if
PV circuits are installed on load side of
consumption CTs) OR Load only (if PV
circuits are installed on utility side or line
side of consumption CTs).
NOTE: Regardless of whether you
select Load only or Load with solar
production, the following steps guide
you to the correct configuration.
Meter Installation Checklist
© 2017 Enphase Energy Inc. All rights reserved. September 2017
2
6. Tap View Readings.
Load only and Load with solar production readings on all consumption lines are positive.
With solar off, the Load only and Load with solar readings should match fairly closely. If you
see either of the following, the Consumption CTS are not installed properly:
1. Negative Load Only readings, or
2. Load with solar production readings that state Exporting to Grid.
If you see either of the above, see Troubleshooting item D on page 3. Otherwise, proceed with the
next step.
NOTE: regardless of what you selected in step 5, both Load only and Load with solar production
readings are displayed.
7. Turn ON a known load, such as a heat gun on maximum setting and run for two minutes.
Under Load only, the Active Power value increases by amount of known load (e.g.,
approximately 1500W for a typical heat gun) on one phase (assuming a 120 VAC single-phase
load).
8. Turn OFF the known load.
9. Turn on the PV breaker(s) and wait five minutes for the PV system to start up.
Check that either of the following is true:
1. Load only readings are greater than Load with solar production readings, or
2. The Load with solar production readings state that the system is Exporting to Grid.
If not, change the configuration selection you made in step 5 (either to Load only or Load with
solar production).
10. Tap Enable Consumption Meter and confirm.
Green checkmark appears next to Consumption Meter.
Now that you have verified meter readings and enabled both meters, go to the Overview screen to see that
all system components are operating as expected.
NOTE: If the system contains an Enphase Storage System, make sure the following are correct:
The AC Battery circuit is NOT measured by the production CT, and
The AC Battery circuit is always interconnected on the load side of the consumption CTs.
Meter Installation Checklist
© 2017 Enphase Energy Inc. All rights reserved. September 2017
3
Troubleshooting
It is strongly recommended that you follow the preceding 10-step checklist to commission CTs. If you
encounter an error not discussed in this guide, it is recommended that you restart the CT commissioning
process from step one.
PRODUCTION METERING ISSUES
If . . .
Possible cause and corrective action
A. Readings on all
production lines are not
positive when PV breaker
is on.
The production CT may be installed with the arrow pointing in the wrong direction.
Check that the arrow is pointing in the direction of energy flow toward the load center.
Terminal block wiring is incorrect. The production CT wires may be connected to the
wrong terminal block positions.
Make sure that the blue and white wires are connected to the correct positions on the
terminal block.
Voltage and current must be measured from the same phase. Make sure that the line
running through your production CT is the same line that lands on the Envoy terminal
block line 1.
Reinstall the production CT on the conductors that correspond to Envoy power
terminal line 1.
Production CT is measuring power other than production. The circuit running through
the production CT may include batteries or loads.
Make sure that the wires running through the production CT includes only the line 1
conductor(s) of PV generation.
B. Readings on production
lines are not zero when PV
breaker is off.
Production CT is measuring power other than production. The circuit running through
the production CT may include batteries or loads.
Make sure that the wires running through the production CT includes only the line 1
conductor(s) of PV generation.
C. Green check mark does
not appear next to meter
on Meters screen.
Meter was not enabled.
Verify readings on meter detail screen and tap enable meter button.
CONSUMPTION METERING ISSUES
If . . .
Possible cause and corrective action
D. Load only or Load with
solar production readings
for consumption meter are
not positive when PV
breaker is off.
One or both of the consumption CTs may be installed with the arrow pointing in the
wrong direction.
Check that the arrow is pointing in the direction of energy flow toward the load center.
Terminal block wiring is incorrect. One or both of the consumption CT wires may be
connected to the wrong terminal block positions.
Make sure the line 1 CT wires land on C1 (position 4 -- IA on older Envoys) terminal
blocks on the Envoy and line 2 CT wires land on C2 (position 5 -- IB on older Envoys)
terminal blocks on the Envoy. Make sure that the blue and white wires are connected to
the correct positions in the terminal block.
E. Load only readings do
not increase when a
known load is added to
the system.
The consumption CTs do not include all loads.
Make sure that all home load is routed through the consumption CTs.
F. Green check mark does
not appear next to meter
on Meters screen.
Meter was not enabled.
Verify readings on meter detail screen and tap enable meter button.
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