Microinverter Troubleshooting¶

EXPANDING

Diagnostic Approach¶

1. CHECK MONITORING → How many units offline? Pattern?
   - One unit → localized failure
   - One branch → branch circuit issue  
   - All units → gateway, main breaker, or grid issue

2. VERIFY PRODUCTION → Is the system actually down or just monitoring?
   - Check AC disconnect and sub-panels
   - Measure AC output at branch circuits if accessible

3. PHYSICAL INSPECTION → Roof inspection of affected area
   - LED state on microinverters (if visible)
   - Wiring connections at AC trunk/branch cables

4. GATEWAY CHECK → Is this a monitoring-only issue?
   - Gateway online? Last sync timestamp?
   - System may be producing but data is not reaching cloud

Common Failure Scenarios¶

Scenario: One Panel Offline in Monitoring¶

Likely cause: Individual microinverter failure

Action: 1. Verify other panels in that branch are reporting normally 2. Inspect physical AC connector at the unit 3. Replace unit if connector is good and unit confirmed failed

Scenario: One AC Branch Offline¶

Likely cause: Tripped breaker, loose AC connector at junction, branch circuit fault

Action: 1. Check breaker panel — is the branch breaker tripped? 2. Reset and monitor 3. If trips again: inspect wiring on that branch 4. If breaker is good: trace trunk cable for loose connection

Scenario: All Units Offline¶

Likely cause: Gateway offline, main AC breaker tripped, grid outage

Action: 1. Is there an active grid outage? 2. Check main AC disconnect and breaker 3. Check gateway — is it online? 4. If gateway offline: restore gateway connectivity

Scenario: System Producing but No Monitoring¶

Likely cause: Gateway lost internet connectivity

Action: 1. Power cycle gateway 2. Check network connection 3. Re-enter Wi-Fi credentials if needed

Related¶

• Enphase Systems
• Gateway Systems