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Generac•PWRcell

Analysis by Marcus & Team

Generac PWRcell Clicking Noise at Sunset

Diagnosing a clicking noise in a Generac PWRcell system at sunset. Learn potential causes, solutions, and safety measures for your home energy storage.

Frequently Asked Questions

•What is the expected lifespan of the relays in the Generac PWRcell inverter?

Relay lifespan depends on switching frequency and current levels. Consult Generac's specifications for the specific relays used. Regular monitoring can help detect early signs of failure.

•How does temperature affect the PWRcell battery performance and relay operation?

Extreme temperatures can degrade battery capacity and increase relay contact resistance. Ensure the inverter and battery are installed in a temperature-controlled environment within Generac's recommended range.

•What are the recommended surge protection devices for a PWRcell system in a lightning-prone area?

Install surge protection devices (SPDs) on both the AC and DC sides of the inverter. Follow NEC 690.15 and Generac's recommendations for SPD selection and placement.

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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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Why This Happens:

Relay chatter due to low or fluctuating PV input voltage near the minimum MPPT voltage threshold.
Battery State of Charge (SOC) reaching a pre-defined level, triggering a charging/discharging cycle.
Grid voltage or frequency fluctuations causing the inverter to attempt synchronization.
Internal contactor wear or degradation, leading to increased resistance and arcing.
Firmware glitch or software bug causing erratic relay operation.
DC bus voltage instability due to component aging in the power conversion stage.

Pro Tip:

Access the Generac PWRcell service menu (refer to the service manual for the key combination) to view real-time relay status and diagnostic codes. This can provide valuable insights into the cause of the clicking noise. Alternatively, a clamp meter around the PV input conductors can help determine if the clicking coincides with changes in current flow.

How It Works:

The Generac PWRcell is a hybrid inverter system integrating solar PV input, battery storage, and grid interconnection. The 'clicking' sound is likely originating from internal relays responsible for switching between different operating modes (e.g., grid-tied, off-grid, battery charging/discharging). Sunset signifies a drop in PV power, triggering the inverter to shift its power source and/or charging strategy. The inverter's control system (firmware) dictates the relay operation based on voltage/current thresholds and pre-programmed logic. Internal contactors manage high-current DC and AC switching. Proper MPPT is essential for optimal PV energy harvesting.

Safety Warning:

The Generac PWRcell system operates with high DC voltages (up to 600V+). Improper handling can result in severe electric shock or arc flash. Only qualified electricians should perform internal inspections or repairs. Always follow NEC 690 guidelines and Generac's safety procedures for disconnecting and isolating the system before any work is performed. Verify rapid shutdown functionality per NEC 2017/2020 requirements.

What to Look For:

The Generac PWRcell hybrid inverter emits a clicking sound approximately every 30 seconds, primarily occurring around sunset. This symptom is observed in residential systems.

Step-by-Step Fix:

1

Using a multimeter, measure the PV string voltage and current during sunset to confirm adequate input power. Record values every 10 seconds for 5 minutes.
2

Monitor the battery SOC using the Generac PWRcell monitoring app to determine if the clicking correlates with charging or discharging events.
3

Check the AC grid voltage and frequency with a multimeter during sunset to identify any fluctuations that may be triggering the inverter.
4

Inspect the inverter's internal components (relays, contactors) for signs of wear, corrosion, or loose connections. This task MUST be performed by a qualified electrician after properly disconnecting the system per NEC 690 and Generac's safety guidelines.
5

Update the inverter's firmware to the latest version to address potential software bugs. This can typically be done through the monitoring app or a service technician.
6

Perform a battery capacity test (if supported by the inverter) to assess the battery's State of Health (SOH). A significantly degraded battery may cause frequent switching.
7

Consult Generac's technical support for further troubleshooting and diagnostics if the problem persists. Reference all recorded voltage, current, and SOC data.

Maintenance Tips:

Schedule regular firmware updates for the PWRcell inverter to ensure optimal performance and bug fixes.
Periodically monitor PV string voltages and currents to identify potential degradation or shading issues.
Check battery SOC and SOH on a quarterly basis using the monitoring app.
Inspect the inverter's cooling system (fans, vents) to ensure proper ventilation and prevent overheating.
Annually, have a qualified electrician inspect all electrical connections for tightness and corrosion per NEC 690.