Troubleshooting Of Iq8 Commercial Microinverter; Led Operation; Dc Resistance Low-Power Off Condition - enphase IQ8 Design Manual

7 Troubleshooting of IQ8 Commercial Microinverter

Follow all the safety measures described in this guide. Qualified personnel can use the following
troubleshooting steps if the PV system does not operate correctly.
WARNING: Risk of electric shock. Do not attempt to repair the Enphase microinverter; it
contains no user-serviceable parts. If it fails, contact Enphase Support to obtain an RMA
(return merchandise authorization) number and start the replacement process.

7.1 LED Operation

The following section describes LED indications.
LED color
Flashing green
Flashing orange
Flashing red
Solid red
Rapid red/Flashing orange
The status LED on each microinverter glows green about six seconds after DC power is applied. It
remains lit solid for two minutes, followed by six green blinks. After that, red blinks indicate that no grid
is present if the system is not yet energized.
Any short red blinks after DC power is first applied to the microinverter indicate a failure during
microinverter startup.
7.2 DC Resistance Low—Power Off condition
For all IQ Series models, a solid red status LED when DC power has been cycled indicates the
microinverter has detected a DC Resistance Low—Power Off event. The LED will remain red, and the
fault will continue to be reported by the gateway until the error has been cleared.
An insulation resistance (IR) sensor in the microinverter measures the resistance between the positive
and negative PV inputs to the ground. If either resistance drops below a threshold, the microinverter
stops power production and raises this condition. This may indicate defective module insulation,
defective wiring or connectors, moisture ingress, or a similar problem. Although the cause may be
temporary, this microinverter condition persists until the sensor is manually reset.
An IQ Gateway Commercial 2 is required to clear this condition. The condition clears on
operator command unless its cause is still present. If a microinverter registers a "DC Resistance
Low - Power Off" condition, you can attempt to clear this condition. If the condition does not
clear after you perform the following procedure, contact
There are two ways to send a clear message to the microinverter. Note that the condition will not clear
after the sensor reset if the cause of the failure is still present. If the condition persists, contact your
installer.
60
IQ8 Commercial Microinverter grid-tied PV system
Table 18: Microinverter LED status
Description
Normal operation. AC grid function is normal. There is communication with the
gateway.
The AC grid is normal, but there is no communication with the gateway.
The AC grid is either not present or not within specification.
There is an active "DC Resistance Low, Power Off Condition." To reset, see "DC
Resistance Low – Power Off Condition."
IQ8 Commercial Microinverter has detected a PV panel that is operating
outside the arc in the safe region.
© 2023 Enphase Energy Inc. All rights reserved.
Enphase Support.
November 2023
USG-00026-1.0