Technical Data; Technical Considerations; Module Requirements; Bifacial Modules - enphase IQ7 Installation And Operation Manual

5 Technical data

5.1 Technical considerations

5.1.1

Module requirements

Apply the following considerations when installing the Enphase IQ7 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 labeled "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).

5.1.2 Bifacial modules

Enphase microinverters are compatible with bifacial PV modules. Bifacial solar modules produce
power from both sides of a bifacial module, increasing total energy generation. The power gained from
the rear side (bifacial gain) is highly influenced by various design factors such as albedo, module
elevation, pitch, temperature, and shading. The bifacial gain can be anywhere between 0% to 30% of
the nominal rating (front-side power rating) of the module. Since the bifacial gain is highly influenced
by various design considerations, pairing the bifacial module with the right microinverter depends on
the electrical characteristics of a given module.
The temperature-adjusted electrical parameters (maximum power, voltage, and current) of the bifacial
modules, considering the front-side electrical parameters (i.e., 0% back-side gain), must be within the
microinverter input parameters range.
See Step 3: Mount the Microinverters
31
IQ7/IQ7+/IQ7X/IQ7A Microinverters Installation and Operation Manual
for tips on vertical mounting of bifacial modules.
© 2023 Enphase Energy Inc. All rights reserved. September 2023
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