IQ system Controller 2 Installation
6
Device Supported SKU’s
1) PCS Controller(IQ
Gate way)
• IQ Gateway i.e., ENV-IQ-AM1-240
• Envoy S metered i.e., ENV-S-AM1-120*
• IQ Combiner boxes containing the IQ Gateway:
IQ Gateway is included in X-IQ-AM1-240-3C,
X-IQ-M1-240-3,
X-IQ-AM1-240-3-ES, X-IQ-AM1-240-3C-ES,
X-IQ-AM1-240-2, X-IQ-AM1-240-B, X-IQ-AM1-240-4,
X-IQ-AM1-240-4C
2) Curr e nt Tra n s fo r m e r s
• CT-200-SPLIT(needs 2 units)
• CT-200-SOLID(included with the IQ Gateway)
3) I Q S yste m Co ntro ll er 2 EP200G101-M240US01
4) IQ Battery • ENCHARGE-3-1P-NA, ENCHARGE-10-1P-NA,
• ENCHARGE-3T-1P-NA, ENCHARGE-10T-1P-NA
5) Microinverters • IQ6 series (IQ6, IQ6Plus), IQ7 series(IQ7, IQ7A, IQ7Plus, IQ7X,
IQ7PD)
• M215 and M250 series*
* Envoy S metered and M-series inverters do not support PV curtailment for MPU avoidance.
Enphase, through its Enphase mobile app, also provides grid proles
that comply with PEL limits for various jurisdictions. In a situation where
both the PCS limit and a PEL prole are being used, the maximum
current backfed from the IQ System Controller 2 to the main panel is
always the lower of the PEL limit and the PCS limit.
NOTE: Import Only Mode for Energy Storage System is xed in
software and cannot be changed in the eld.
Conguring PCS In the Enphase Storage System
A ) Check that you have the following items. You must use the listed CTs
and Enphase IQ Gateway or the Envoy-S Metered with the IQ System
Controller 2 and IQ Battery for Power Control System functionality.
• Two current transformers (CT-200-SPLIT) for consumption/PCS
monitoring
• One current transformer (CT-200-SOLID) for production metering
(included with IQ Gateway)
• IQ Gateway (ENV-IQ-AM1-240) or Envoy-S Metered (ENV-S-AM1-120):
The IQ Gateway can be standalone or integrated in an IQ Combine box.
B ) Follow all instructions in the IQ Gateway or IQ Combiner Quick Install
Guide to ensure that CTs are installed and wired correctly with correct
polarity. Refer to the following diagram for the locations and polarity (arrow
on top of CT) on the CTs.
For whole home backup conguration, the CTs should be placed in the
same location (Production CT in IQ Combiner; PCS CT in IQ System
Controller 2) as shown in the diagram PCS CT installation within IQ System
Controller 2.
C ) When being used for PCS, you must install the CT-200-SPLIT current
transformer inside the system controller on the conductors near the service
entrance of the the system controller. The arrows on the Consumption/PCS
CT must point towards the loads, towards the busbar inside the IQ System
Controller 2. Refer to the image on the next page for the Consumption/PCS
CT location and wiring to the IQ Gateway.
D ) You must protect all PCS controlled busbars and/or conductors with
suitably rated overcurrent devices that are appropriately sized for the busbar
rating or conductor ampacity. Refer to the IQ Gateway/IQ Combiner QIG to
see wiring details for CTs.
E) You must indicate, with a label, the maximum current setting for back-
feed from IQ System Controller 2 that is controlled by PCS. Apply a label on
the IQ System Controller deadfront indicating the maximum current setting
for back-feed from IQ System Controller 2 that is controlled by PCS. An
example of the required label is shown as follows. Record the maximum
operating amps value on the label.
THE MAXIMUM CURRENT BACKFED BY THIS SYSTEM TO THE MAIN
PANEL MAY BE CONTROLLED ELECTRONICALLY. REFER TO MANU-
FACTURER’S INSTRUCTIONS FOR MORE INFORMATION
PCS CONTROLLED CURRENT SETTING: ___________ AMPS
Set Up the Power Control System
The IQ System Controller 2 device, when used with IQ Gateway and Produc-
tion as well as Consumption/PCS CTs, enables the Power Control System
(PCS) functionality in the Enphase Storage System.
The Enphase Storage System supports 2 PCS use cases:
• Import Only mode for Energy Storage System (ESS): Enphase Storage
System can import power from the Area Electric Power System (EPS)
for charging purposes but does not export active power from the ESS
to the Area EPS. The ESS mode of Import Only applies irrespective
of the congured battery smart prole, i.e., Self-Consumption, Full
Backup, or Savings (Time of Use) with optimization.
• Main Panel Upgrade (MPU) avoidance: In the partial home backup
scenario, the PCS limit the currents backfed into the main panel as
allowed by 2020 NEC article 705.13. This ensures that the main panel
complies with the NEC article 705.12.
NOTE: This use case is only supported with IQ Gateway and
IQ6/7/8 series inverters.
This mode is applicable when the system is congured as in
Scenario 2 as described on page 1 of this QIG.
The National Electric Code(NEC) 2017 NEC 705.12(B)(2)(3)(b) allows
backfeed of current from solar/storage into the main panel subject to
the following limit
Backfeed allowed <= ((120% of busbar rating) – Ampacity of
the overcurrent protection device protecting the busbar )/
125%