SolarEdge Error Code 18xB – Meaning, Causes & Solution -... | solardiagnostics.org

Technical Background:

The SolarEdge inverter monitors the AC voltage supplied by the utility grid. When the voltage exceeds the predefined threshold, the inverter triggers fault code 18xB to protect itself and the connected solar array. This safeguard is crucial as prolonged exposure to high voltage can damage the inverter's internal components. The inverter continuously checks the grid voltage, and any anomalies, such as spikes or sustained high voltage, will result in a shutdown to ensure safety and compliance with electrical standards.

Symptoms:

Users will typically observe the inverter's LED indicator flashing a specific fault code pattern associated with error 18xB. The monitoring app may display a grid voltage alert, and there may be a noticeable drop in solar energy production, indicating that the inverter is unable to feed power into the grid due to high voltage conditions.

Possible Causes:

AC voltage from the utility grid exceeds the inverter's operational limits.
Faulty voltage sensing circuitry within the inverter.
Incorrectly configured grid settings in the inverter.
External factors such as nearby lightning strikes causing transient voltage spikes.
Issues related to the utility grid, such as poor voltage regulation or fluctuations.
Damaged or corroded wiring in the AC output circuit.

Solution:

1

Use a multimeter to measure the AC voltage at the inverter's output terminals. Ensure it is within the acceptable range specified in the SolarEdge system manual.
2

Inspect the inverter's grid settings via the monitoring app or web portal. Confirm that the grid voltage limits are configured correctly.
3

Check for any visible damage or corrosion in the AC wiring, especially at junction boxes and connections.
4

If the voltage readings are consistently high, contact the utility provider to investigate grid conditions and voltage regulation.
5

If internal circuitry is suspected, perform a reset of the inverter by disconnecting it from the AC supply and waiting for a few minutes before reconnecting.
6

If the fault persists, consult the inverter’s service manual for advanced diagnostics or contact SolarEdge support for further assistance.

Safety Warning:

Always consult a licensed electrician or certified solar installer before performing any troubleshooting or repair tasks on the inverter or associated electrical systems.

Prevention:

To prevent future occurrences of the 18xB error, ensure regular maintenance checks on the inverter and associated wiring. Install surge protection devices to mitigate the risk of voltage spikes from external sources. Regularly monitor grid voltage conditions and collaborate with the utility provider to address any ongoing voltage regulation issues.

Frequently Asked Questions

•What causes the AC Voltage Too High error?

The AC Voltage Too High error can occur due to grid voltage fluctuations or incorrect inverter settings. It's essential to check the grid voltage and ensure it is within the acceptable range.

•How can I reset the inverter after an error?

To reset the inverter, turn off the AC disconnect switch and wait for a few minutes before turning it back on. This can help clear temporary faults.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What causes the AC Voltage Too High error?

•How can I reset the inverter after an error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: