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SolarEdge•Energy Hub

Analysis by Marcus & Team

SolarEdge Energy Hub Error 3x9B: Rapid Shutdown Active

Troubleshoot SolarEdge Energy Hub Error 3x9B. Rapid shutdown issues, diagnostics, and solutions for residential SolarEdge hybrid inverter systems.

Frequently Asked Questions

•What are the NEC requirements for Rapid Shutdown?

NEC Article 690.12 outlines the requirements for rapid shutdown of PV systems, focusing on de-energizing conductors outside the array within a specified timeframe.

•How do I reset the SolarEdge Energy Hub inverter?

Consult the SolarEdge installation manual for the specific reset procedure for the Energy Hub. Typically involves cycling the AC and DC disconnects in a specific sequence.

•What is the warranty on the SolarEdge Energy Hub?

Refer to the SolarEdge warranty documentation for the Energy Hub. The warranty period and coverage vary depending on the model and installation date.

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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 Overview:

The SolarEdge Energy Hub is a hybrid inverter managing DC power from PV arrays and battery storage, converting it to AC for grid export or home consumption. Error 3x9B signifies the inverter has received a signal to initiate rapid shutdown, a safety feature mandated by NEC 2017/2020 (690.12) to de-energize PV conductors during emergencies. This signal can originate internally (inverter fault) or externally (RSD initiator device). Accurate diagnostics require understanding of the RSD circuit topology. The inverter’s MPPT function is disabled during RSD events.

Observed Symptoms:

SolarEdge Energy Hub displays Error 3x9B, indicating that the Rapid Shutdown System (RSD) is active. This may occur during normal operation or unexpectedly, preventing power generation and/or battery charging/discharging.

Pro Tip:

Disconnect the RSD initiator wiring at the inverter terminals. If the error clears, the fault lies in the external RSD circuit. Use a wire tracer to identify the specific wire run.

Common Causes:

Faulty Rapid Shutdown initiator device (e.g., emergency switch).
Communication failure between the inverter and RSD devices.
Internal inverter fault triggering false RSD activation.
Ground fault in the PV array conductors.
Improper wiring of the RSD system.
Voltage drop in the RSD control circuit.

Important Warnings:

High DC voltage (up to 600V+) is present in PV circuits. Only qualified personnel with appropriate PPE should perform electrical testing. Always follow NEC guidelines for safe work practices and arc flash prevention. Ensure proper grounding of the PV system components.

Step-by-Step Fix:

1

*Safety First**: Verify AC disconnect is open and engage the DC disconnect switch per SolarEdge safety procedures. Wait 5 minutes for capacitor discharge before proceeding.
2

*Visual inspection**: Check all RSD initiator devices (switches, buttons) are in the normal (non-active) position. Inspect wiring for damage or loose connections.
3

*RSD Initiator Testing**: Use a multimeter to verify the voltage at the RSD initiator device. Confirm the correct voltage level to release the RSD per manufacturer specifications.
4

*String Voltage Measurement**: With DC disconnect closed momentarily (qualified electrician only!), use a multimeter to measure PV string voltages at the inverter DC input. Compare to expected values based on array configuration and irradiance. Record voltage and current.
5

*Inverter Diagnostics**: Access the SolarEdge monitoring portal or inverter display for detailed error logs and system status. Check for other fault codes that may indicate a root cause.
6

*Firmware Update**: If available, update the inverter firmware to the latest version through the SolarEdge monitoring portal. This may resolve software-related RSD triggers.
7

*licensed technician Consultation**: If the problem persists, contact a qualified solar installer or SolarEdge technical support for further assistance. A site visit may be required to pinpoint the failure.

Maintenance Tips:

Schedule annual system inspections by a qualified electrician
Regularly monitor the SolarEdge monitoring portal for performance anomalies and error messages
Keep the inverter firmware up to date
Inspect RSD initiator devices and wiring for damage