Technical Data; Technical Considerations; Compliance Data; Anti-Islanding Function - enphase IQ7 Installation And Operation Manual

Technical data

Technical considerations

Be sure to apply the following when installing the Enphase IQ Series Microinverter System:
WARNING: Risk of equipment damage. You must match the DC operating voltage range of the PV
module with the allowable input voltage range of the Enphase microinverter.
WARNING: Risk of equipment damage. The maximum open circuit voltage of the PV module must not
exceed the specified maximum input voltage of the Enphase microinverter.
• PV modules must have conductors labelled "PV Wire" or "PV Cable" to comply with NEC for
ungrounded PV Power Systems.
• Verify that the voltage and current specifications of the PV module match those of the microinverter.
• The maximum short circuit current rating of the PV module must be equal to or less than the
maximum input DC short circuit current rating of the microinverter.
The output voltage and current of the PV module depend on the quantity, size, and temperature of the PV
cells, as well as the insolation of each cell. The highest PV module output voltage occurs when the
temperature of the cells is the lowest and the PV module is at an open circuit (not operating).

Compliance data

Anti-islanding function

Enphase IQ7 Series Microinverters use the following anti-islanding functions:
• Rate of change of frequency (RoCoF)
• Vector Shift
• Harmonic injection (soon to be replaced by VAR injection)
Enphase IQ7 Series Microinverters listed by UL and tested in accordance with IEEE1547-2018 in accordance
with UL1741-SB.
IQ7 Series Microinverters use the Group 1 (Frequency Shift with continuous positive frequency feedback)
method of anti-islanding based on the definitions provided in the list below as defined in
July 2018:
Group 1: Frequency Shift with continuous positive frequency

PIQ capability curve

If needed, Enphase IQ7 Series Microinverters have the capability to absorb or inject reactive power, provided
that current and voltage ratings are not exceeded. The following figure shows the active power (P)
capabilities curve relative to reactive power (Q) related to the power rating in the operating voltage range for
Enphase IQ7 Series.
• Maximum power factor (pf) adjustability = -0.8 to 0.8
• Reactive power capability = ± 50% (over/under excited) provision or absorption of reactive energy
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IQ7+/IQ7X/IQ7A Microinverters Installation and Operation Manual
© 2023 Enphase Energy Inc. All rights reserved.
Sand2018-8431,
August 2023
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