enphase IQ System Controller 1 Technical Brief page 15

WARNING: This procedure involves multiple high-voltage sources of power. To ensure the
installer/electrician's safety, perform the following steps in sequence.
1. Turn off the grid supply to the IQ System Controller.
Disconnect the utility supply from the IQ System Controller to de-energize the conductors
entering its utility input.
•
If there is a utility system disconnect (outside the IQ System Controller and connected
to the utility input of the IQ System Controller), turn off the utility disconnect.
•
If there is a panel on the utility side of the IQ System Controller, turn off the breaker
feeding the IQ System Controller in the panel.
•
If the IQ System Controller is being used as service equipment, with a utility breaker
inside it acting as the service disconnect, ensure that the service conductors cannot be
energized and turn off the CSR breaker within the IQ System Controller.
2. Turn off the DC switches in all IQ Batteries.
•
For IQ Battery 3T (ENCHARGE-3T-1P-NA) and IQ Battery 10T (ENCHARGE-10T-1P-NA),
turn off the DC switch on all batteries by opening the cover.
•
The battery's power activates the IQ Battery 5P's LED-based DC switch. If the battery
SoC is less than 2%, one may be unable to turn it off. Also, the IQ Battery 5P
automatically turns off when the battery's state of charge is deficient (less than 2%
SoC), which prevents the battery from further discharging and helps to avoid the
battery entering a non-recoverable mode.
3. Turn off all PV branch circuit breakers in the AC/IQ Combiner or sub-panel used to aggregate
solar. Failing to do so will damage Enphase equipment and the generator.
•
Ensure that all PV branch circuit breakers are turned OFF.
•
Ensure that the Gateway breaker is turned ON if the Gateway is powered from the load
center in the AC/IQ Combiner.
4. Confirm the state of the following breakers inside the IQ System Controller.
•
Ensure that the AC Combiner breaker (PV breaker) is turned on.
•
Ensure that the NFT breaker is turned on.
•
Ensure that the Gateway breaker is turned on if the IQ Gateway is powered from the
load center in the IQ System Controller.
•
Ensure that the IQ Battery breaker is turned off.
•
Ensure that the backup loads breaker, if present, is turned off. If there is no backup loads
breaker, turn off the main supply breaker in the backed-up loads panel.
5. If there is an Enphase RSD switch, make sure it is turned off. Measure the voltage of the load
center, PV, and battery lugs in the IQ System Controller.
•
Remove the IQ System Controller dead front.
•
The measured voltage of the load center, IQ Combiner lugs, and battery lugs should be
zero volts AC. If the voltage is not zero, check that the voltage sources to the
IQ System Controller are disconnected before continuing.
6. Prepare the generator for connection to the IQ System Controller.
•
Ensure that the generator is turned off.
•
Ensure that the generator is filled with fuel and oil.
15
State of charge recovery for an Enphase Energy System
NOTE: Ensure that the generator fulfills the criteria.
© 2024 Enphase Energy Inc. All rights reserved. June 2024
TEB-00084-2.0