SolarEdge inverter: DC isolation fault — what it means and what to do
The inverter has detected that the solar array is not properly isolated from ground, which can mean a ground fault in the DC wiring. Treat it as urgent. Switch the system off with the inverter ON/OFF switch, do not restart it repeatedly, and call a professional.
Safety: act now
What we see across our fleet
- We have seen this fault on 156 SolarEdge systems, 1.8% of the 8,871 SolarEdge systems we monitor (last 12 months).
- Once it appears, the system usually clears it in about 30 hours (median), and 9.3% clear within 24 hours.
- Replacement cases on record involve these SolarEdge models: U650-1GM4MRMU-A05 (371), USE11400H-USSKBEZ8 (365), SE7600H-USMNUBL75 (118), NX13000T-US00UCYN4 (84), SE10000H-USMNUBL75 (61).
- Source: Otovo fleet monitoring and service records, data through October 2026.
Common causes
- Damaged insulation on a panel, cable, or connector.
- Moisture or water in a connection.
- A faulty component in the solar array.
- Wiring that was pinched or damaged.
Safe steps to try
- Switch the system off Turn the inverter ON/OFF switch to OFF. Do not open the inverter or touch any wiring, panels, or optimizers.
- Do not keep restarting SolarEdge says the isolation is checked each time the inverter starts. Repeated restarts will not fix a real ground fault.
- Note the alert Write down the alert text and time, and whether it rained recently.
- Call a professional SolarEdge states that only a certified PV installer should fix the faulty string.
When to call a professional
Otovo services these systems and can diagnose this fault for you. Call as soon as possible. A qualified installer needs to find and fix the faulty string before it is reconnected. Call 911 if there is smoke, fire, or a burning smell.
Frequently asked questions
- Is this the same as a ground fault?
- SolarEdge describes it as a PV isolation fault with possible ground leakage.
- Can I reset it until it works?
- No. A real isolation problem needs an installer.
- Is it safe to touch the system?
- No. Do not touch the inverter wiring, panels, or optimizers.
Other SolarEdge faults
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- SolarEdge power optimizer: no communication — what it means
- SolarEdge inverter: production issue detected — what to do
- SolarEdge inverter: no site communication — what it means and what to do
- SolarEdge inverter: no communication with the meter — what it means
- SolarEdge inverter: no communication with the inverter — what to do
- SolarEdge inverter: grid voltage error — what it means and what to do
- SolarEdge inverter: external fan fault — what to do
- SolarEdge inverter: arc fault detected — what to do now