| COMMUNICATION ISSUE Microinverters are still producing power, but data is not reaching the EMA portal. The ECU and the microinverters have lost their Zigbee link. |
PRODUCTION ISSUE Microinverters are genuinely not generating power. The Module View shows 0W or very low output compared to other panels. |
A. Check the ECU Heartbeat first
In the EMA portal go to Diagnose > Diagnose and check "Last Heartbeat Time." If the heartbeat is
within the last 30-60 minutes, the ECU is online — focus troubleshooting on the Zigbee link
between the ECU and microinverters. If there is no recent heartbeat, start with ECU connectivity
(see section 2).
B. Wait and re-check after a couple of hours
Occasional NC status can result from a momentary internet signal drop or heavy EMA server traffic.
If only some microinverters show NC and the issue is recent, give the system up to 2 hours to
recover before taking further action.
C. Verify microinverters are registered in the ECU
In the EMA portal go to Remote Control > ECU Settings and confirm each microinverter has an
active "link." If any unit shows no link, select it, click "Add," and press "Send." The link should
become visible within 20 minutes.
D. Check ECU antenna placement and Zigbee signal strength
Ensure the ECU antennas are fully screwed in and positioned outside any metal AC box or cabinet.
Large concrete walls or metallic roofing between the ECU and inverters can also weaken the
Zigbee link. Try relocating the ECU closer to the array if possible.
E. Update ECU firmware
Ensure the ECU is powered on and connected to the internet — it will automatically download and
apply the latest firmware within about 5 minutes. Firmware mismatches (especially after adding
newer DS3 microinverters to an older ECU) can prevent communication.
Tip: You can confirm ECU server connectivity by checking the cloud LED on the ECU unit. LED on =
connected to EMA server. LED off = disconnected.