storagefaults.comstoragefaults.com

Generac•PWRview

Analysis by Marcus & Team

Generac PWRview: Solar Output Not Dropping During Clouds

Troubleshoot Generac PWRview solar system maintaining output during cloudy conditions. Identify possible causes and solutions. NEC compliant diagnostics.

Frequently Asked Questions

•How do I safely disconnect my Generac PWRview system?

Consult the Generac PWRview manual for the specific DC disconnect procedure. Typically, it involves switching off the DC disconnect located near the inverter and/or PV array. Verify voltage is zero using a calibrated meter.

•Where can I find the latest firmware updates for my Generac PWRview inverter?

Firmware updates are typically available on the Generac website under the support section for your specific inverter model. You may also be able to update the firmware through the PWRview monitoring app.

•What are the common causes of MPPT failure in solar inverters?

Common causes include component failure (e.g., capacitors, MOSFETs), software bugs, incorrect configuration, and overheating. Environmental factors and improper maintenance can also contribute.

Related questions

Loading related questions...

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.

← Back to list

Critical Safety Precautions:

Solar PV systems operate at high DC voltages, posing a significant electrical shock hazard. Always disconnect the DC disconnect switch before performing any maintenance or troubleshooting. Ensure rapid shutdown (RSD) is activated and verified. Only qualified electricians with experience working on solar PV systems should perform these tasks. Arc flash hazards are also present. Follow all NEC guidelines and manufacturer-specific safety procedures.

Common Causes:

Faulty irradiance sensor or algorithm: The system might not be accurately detecting cloud cover due to sensor malfunction or software error.
Inverter MPPT malfunction: The MPPT algorithm may be stuck at a high power operating point, failing to respond to changes in solar irradiance.
Communication error between PV array sensors and the inverter: Data from sensors indicating cloud cover may not be reaching the inverter's control system.
DC offset or leakage current: A DC offset in the PV array can cause current to flow even with limited light, resulting in erroneous power readings.
Metering or reporting error: The PWRview monitoring system may be misinterpreting the actual power output or displaying incorrect data.
Firmware or software bug: A software issue within the inverter's control system could prevent accurate power tracking.

Technical Overview:

The Generac PWRview system utilizes Maximum Power Point Tracking (MPPT) algorithms to optimize DC power extraction from the PV array. This DC power is then converted to AC power via a grid-tie inverter and potentially used to charge battery storage. The system monitors string voltages and currents, DC bus voltage, and AC grid parameters (voltage, frequency, current) to regulate power flow. In normal operation, irradiance sensors (or inferred irradiance) inform the MPPT algorithm to reduce the operating point (voltage and current) of the PV array during periods of low light, thus decreasing overall power output. Failure of this reduction mechanism results in the described symptom. The inverter's anti-islanding protection should also function correctly, shutting down the inverter if grid power is lost and preventing backfeeding. Rapid shutdown (RSD) should also activate during emergency situations to reduce DC voltage to safe levels.

Pro Tip:

Access the Generac PWRview service menu (consult Generac documentation for key combination). Monitor the real-time irradiance sensor data directly from the inverter. Compare this value with the inverter's MPPT target voltage/current. If the irradiance is low, but the MPPT target is still high, suspect a faulty MPPT algorithm or sensor calibration issue.

What to Look For:

Solar production, as reported by the Generac PWRview monitoring system, fails to decrease proportionally with reduced solar irradiance (cloud cover). This is observed as a sustained high power output despite visibly overcast skies.

Recommended Action:

1

Verify irradiance sensor functionality: Use a calibrated pyranometer to measure solar irradiance and compare it to the PWRview system's reported values. If there's a significant discrepancy, the sensor may need replacement.
2

Check inverter firmware: Ensure the inverter's firmware is up to date. Outdated firmware can contain bugs that affect MPPT performance. Refer to the Generac website for the latest firmware version and update instructions.
3

Monitor string voltages and currents: Use a DC clamp meter and multimeter to measure the voltage and current of each PV string. Look for any anomalies, such as excessively high current readings or unusual voltage drops. (NEC 690)
4

Inspect DC wiring: Examine all DC wiring connections for corrosion, loose connections, or damage. Clean and tighten connections as needed.
5

Review inverter error logs: Check the PWRview interface or inverter display for any error codes related to MPPT, irradiance sensors, or communication. Refer to the Generac troubleshooting guide for error code definitions and recommended actions.
6

Perform a system reset: Try resetting the PWRview system and inverter to their factory settings. This can sometimes resolve software glitches or configuration errors. Refer to the Generac manual for the proper reset procedure.
7

Contact Generac support: If the issue persists after attempting the above steps, contact Generac's technical support for further assistance. Provide them with detailed information about the symptoms, error codes, and troubleshooting steps taken.

Maintenance Tips:

Regular firmware updates: Keep the PWRview system and inverter firmware up to date to benefit from bug fixes and performance improvements.
Periodic system monitoring: Monitor the system's performance regularly, paying attention to power output, string voltages, and irradiance readings. This can help identify potential problems early on.
licensed technician inspection: Schedule a licensed technician inspection of the solar system and inverter at least once every two years. A qualified technician can identify and address potential issues before they escalate.
Cleaning of PV modules: Regularly clean the PV modules to remove dirt and debris, which can reduce their efficiency and affect power output.