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SolarEdge Error 18x20 System Boot Failure

Troubleshoot SolarEdge Error 18x20 on residential hybrid inverters. Learn causes, solutions, and safety for system boot failures after firmware updates.

Frequently Asked Questions

•What is the typical DC voltage range for SolarEdge inverters during operation?

The DC voltage range varies depending on the model, but residential SolarEdge inverters often operate between 300V and 600V DC.

•How do I access the error logs on a SolarEdge inverter?

Error logs are typically accessible through the SolarEdge monitoring portal or the SetApp commissioning tool. Consult the SolarEdge documentation for your specific model.

•What are the NEC requirements for rapid shutdown in residential solar installations?

NEC 2017/2020 mandates rapid shutdown capabilities within and outside the array boundary. This typically requires shutting down DC conductors to 30V within 30 seconds of initiating rapid shutdown.

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Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

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Technical Background:

The SolarEdge hybrid inverter integrates MPPT, DC-DC conversion for battery charging, DC-AC conversion for grid interaction, and safety features like arc fault detection and rapid shutdown. Error 18x20 indicates a critical failure during the boot sequence, often related to firmware corruption or hardware initialization issues. The error halts the inverter's internal processor, preventing normal operation and grid synchronization. Proper DC bus voltage regulation and frequency (60Hz) control are essential for grid-tie functionality.

Symptoms:

The SolarEdge hybrid inverter fails to boot after a firmware update, displaying Error 18x20. The inverter may show no display or a frozen screen, and power production ceases. Battery charging/discharging is also disabled.

Possible Causes:

Corrupted firmware during the update process due to power interruption or network instability.
Hardware failure in the inverter's processor or memory modules.
Incompatibility between the new firmware and the existing hardware version.
DC bus voltage fluctuations during the update, causing instability.
Communication errors between the inverter's components during the boot sequence.
Failed EEPROM write cycle during the firmware update.

Solution:

1

*Safety First**: Ensure the AC and DC disconnects are switched OFF before performing any troubleshooting. Verify zero voltage using a calibrated multimeter.
2

*Visual inspection**: Check for any visible signs of damage on the inverter's enclosure or internal components (e.g., bulging capacitors, burn marks).
3

*Firmware Re-Flash**: Attempt to re-flash the firmware using the SolarEdge commissioning tool (SetApp) via direct Ethernet connection. Ensure a stable internet connection and uninterrupted power supply during the process. Follow SolarEdge's official firmware update procedure.
4

*DC Bus Voltage Check**: After a successful re-flash (if possible), measure the DC bus voltage using a multimeter. Compare it to the expected value specified in the inverter's datasheet. An abnormal voltage could indicate a hardware fault.
5

*Communication Check**: Verify communication between the inverter and the monitoring portal. Check the Ethernet cable and network settings.
6

*Contact SolarEdge Support**: If the error persists after re-flashing the firmware and checking the DC bus voltage, contact SolarEdge technical support for further assistance. Provide them with the inverter's serial number and the troubleshooting steps you have already taken.
7

*Warranty Claim**: If the inverter is still under warranty, initiate a warranty claim with SolarEdge.

Safety Warning:

SolarEdge hybrid inverters operate at high DC voltages (up to 600V or higher). Improper handling can result in severe electric shock or arc flash. Always disconnect both AC and DC power sources before performing any troubleshooting or maintenance. Only qualified electricians with experience in solar PV systems should perform internal repairs. Adhere to all applicable NEC guidelines for safe work practices, including the use of appropriate personal protective equipment (PPE).

Prevention:

• Ensure a stable and reliable internet connection during firmware updates.
• Use a UPS (Uninterruptible Power Supply) to protect the inverter from power interruptions during firmware updates.
• Regularly monitor the inverter's performance and error logs through the SolarEdge monitoring portal.
• Perform periodic visual inspections of the inverter's enclosure and cooling vents.
• Keep the inverter's firmware up to date with the latest versions released by SolarEdge.

Expert Tip:

Try performing a factory reset via the SolarEdge SetApp. Look for the "Factory Reset" option in the maintenance menu. This may clear any corrupted settings and allow the inverter to boot correctly. However, note that this will erase all custom settings and require re-commissioning.