IQ Load Controller Additional Info

Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts

The above PV shedding wiring diagram is placed along with the QIG inside the enclosure of the IQ Load

Controller. If setting up PV shedding on a site, it would be useful to stick this label over the load shedding

wiring diagram stuck on the inner door of the enclosure. Follow all the instructions in the QIG provided

with the product to setup PV shedding on a site.

Using Load control in a Sunlight Backup system

A critical use case of the load control feature is for a Sunlight Backup system. This is a system with grid

forming IQ8 microinverters on the room, and an IQ System Controller but without a IQ battery on site.

Such a system can remain powered during sunlight hours even in the absence of the grid. For optimal

energy utilisation in such a system, Enphase recommends connecting the 4 most critical loads on the

backup panel and controlled by 2 IQ Load Controllers (each IQ Load Controller controlling 2 loads). This

provides the homeowner complete control over the 4 loads enabling the homeowner to shed one or more

of these loads if required to ensure the other loads can remain powered for longer.

In sunlight backup mode, the system uses granular control of every load to try each load individually

when it restarts post a collapse. Loads that repeatedly cause collapse are shed automatically after a few

tries so that the homeowner gets the microgrid back with the loads that can be supported. The

homeowner can manually reconnect the load when they believer power available has increased.

Load control modes in the Enphase Installer App

The Ensemble system can change the state of the auxiliary contact based on grid state, generator

availability, and battery state of charge. This section describes the different control modes that are

supported for solar and load circuits using auxiliary contacts.

The load control modes available are as follows:

• Basic Mode: Shed load when off-grid

• Scheduled Mode: When off-grid, shed loads at a certain time of the day.

• Advanced Mode: Shed load when off-grid based on battery state of charge or generator availability.

• Manual Mode: Keep the load permanently on or off irrespective of grid availability.

Load or solar circuits connected to IQ System Controller Auxiliary contacts can be configured to any of the

modes above using the Enphase Installer App.

Note: Generator Mode available for systems with a standby generator. Generator support being released

soon for Enphase Storage system.