IQ Load Controller Additional Info

Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts
27 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021
Wireless
comms
IQ Combiner
Mobile
connect
`
IQ
combiner
Autotransfor
mer
Generator
Encharge
Enpower 200G
Back up load panel
Wireless
comms
N
Shed PV
Power line
Auxiliary contact wiring 12Vdc
Legend
IQ6/7 Microinverters
AC to DC
Power Supply
Power Relay
w/ 12Vdc Coil
ENVOY
N
To utility grid
120/240V single
phase service only
Contactor w/
120Vac Coil
Note:
• NC1 – Normally Closed auxiliary contacts used to control a load circuit when
system is in backup mode
• The power relay w/ 12Vdc coil is used to control a contactor (w/ 120Vac
coil) which switches the PV branch circuit (s)
• The 120Vac coil must be connected to a breaker on the backed up loads
panel via the NO and COM terminals of the power relay
• Enpower switches the 12Vdc power to the coil of the power relay to shed or
connect the loads/sub-panel
NO
COM
NC1
Figure 26: PV shedding using external contactor with 120 Vac coil
`
IQ
combiner
Autotransfor
mer
Generator
Encharge
Enpower 200G
Back up load panel
Wireless
comms
N
Note:
• NC1 – Normally Closed auxiliary contacts used to control a load circuit when
system is in backup mode
• The power relay w/ 12Vdc coil is used to control a contactor (w/ 120Vac
coil) which switches the power to the loads or sub-panel
• The 120Vac coil must be connected to a breaker on the backed up loads
panel via the NO and COM terminals of the power relay
• Enpower switches the 12Vdc power to the coil of the power relay to shed or
connect the loads/sub-panel
Power line
Auxiliary contact wiring 12Vdc
To loads or
sub-panel
AC to DC
Power Supply
Contactor w/
120Vac Coil
Power Relay
w/ 12Vdc Coil
NC1
N
G
NO
COM
Figure 27: Load shedding using external contactor with 120 Vac coil