What are the hardware and communication requirements for Enphase Energy Systems to comply with IEEE 1547-2018?
IEEE 1547-2018 adds new requirements for interoperability. IEEE 1547-2018 defines Interoperability as: The capability of two or more networks, systems, devices, applications, or components to externally exchange and readily use information securely and effectively.
The two main areas of interoperability compliance are separated into hardware requirements and communications protocol requirements.
a. Hardware requirements
IEEE 1547-2018 requires a local DER communications interface located at the DER site. The IQ Gateway provides the local DER interface in Enphase Energy Systems.
IEEE 1547-2018 requires the local communications interface to remain available whenever the DER is operating. This indirectly creates a requirement for the IQ Gateway not to reboot during and following a low voltage ride through event. The IQ Gateway hardware was redesigned to meet this requirement so installers must only choose from the list of supported hardware and be running software versions 7.3.460 or later to be fully compliant.
SKUs that include the new IQ Gateway hardware and will be available for order soon.
|IQ Combiner 4
||Combiner box with IQ Gateway
|IQ Combiner 4C
||Combiner box with IQ Gateway and cell modem
||Standalone IQ Gateway
Note: Enphase IQ7 and IQ8 Microinverters and IQ Battery 3/3T/10/10T products meet the requirements for IEEE 1547-2018, and when installed with the above supported hardware, according to the provided instructions, create a fully compliant DER System.
Installers and distributors who service New York and New England will have open POs for the existing IQ Combiner and IQ Gateway SKUs automatically transitioned over to compliant SKUs starting in December to receive compliant hardware prior to the earliest possible implementation date.
b. Communication protocols
IEEE 1547 requires the interoperability functions to support one of three communication protocols: IEEE 2030.5, Sunspec (Modbus or TCP), or DNP 3. The protocol used at a given site is specified by the utility.
i. IEEE 2030.5
IEEE 2030.5 has been selected as the interoperability protocol in CA and HI. IEEE 2030.5 appears to be emerging as the defacto national standard interoperability protocol. Enphase products support IEEE 2030.5 via the IQ Gateway.
ii. Sunspec modbus
Sunspec modbus is a legacy protocol commonly used in older equipment and some energy management systems. Enphase support for modbus is under development.
iii. DNP 3
DNP 3 is a legacy protocol commonly used by utilities in large power plants and substation automation. Because it is used in large power plants it may be required in very large, multi-MW systems. We are unaware of any utility which requires DNP 3. Enphase Energy Systems are not designed for or supported at this scale, so we do not presently plan to implement this protocol.