Pylontech Error Code 85 – Meaning, Causes & Solution -... | solardiagnostics.org

Technical Background:

Error 85 is triggered when the inverter detects a current imbalance across the battery strings. This can occur due to various factors affecting the electrical logic within the system, such as unequal states of charge among the battery cells, which can lead to different voltage outputs. The inverter continuously monitors the current flowing from the battery bank to ensure it aligns with the expected parameters. If the current readings deviate beyond acceptable thresholds, the inverter will initiate a fault to protect the system from potential damage. Ground fault detection and RISO (insulation resistance) measurements are also critical in this context, as they help identify underlying issues that could contribute to current asymmetry.

Symptoms:

Homeowners may notice that the inverter's LED indicator is flashing a specific pattern associated with Error 85. In addition, monitoring apps may display alerts indicating current asymmetry. There can also be a drop in overall system performance, reflected in reduced energy production metrics.

Possible Causes:

Current imbalance in the battery strings due to unequal state of charge.
Faulty battery cell or module causing inconsistent voltage output.
Improper wiring connections leading to resistance differences.
Inadequate temperature management affecting battery performance.
Issues with the inverter's current sensing mechanisms or firmware bugs.

Solution:

1

Use a multimeter to measure the voltage of each battery string to identify discrepancies in voltage levels.
2

Inspect all wiring connections for signs of corrosion or loose connections, ensuring all terminals are secure.
3

Check the battery management system (BMS) settings for any misconfigurations.
4

If necessary, reset the inverter by disconnecting it from the power source for a few minutes before reconnecting.
5

Monitor the system through the manufacturer’s monitoring app to observe if the error persists after corrective actions.
6

If the error remains, consult the manufacturer's technical support for firmware updates or specific troubleshooting protocols.
7

Document all findings and actions taken for future reference.

Safety Warning:

Always consult a licensed electrician or certified solar installer when troubleshooting electrical issues. Working with high-voltage systems poses significant risks, and licensed technician assistance ensures compliance with safety standards.

Prevention:

To prevent future occurrences of Error 85, ensure regular maintenance of the battery system, including periodic voltage checks of each string and confirming that all connections remain tight and corrosion-free. Implement a routine inspection of the battery management system to verify that all settings are correct and that firmware is up to date. Additionally, maintain optimal temperature conditions for battery operation to enhance performance and longevity.

Frequently Asked Questions

•What does Error Code 85 indicate?

Error Code 85 indicates a current asymmetry issue within the battery system, which can affect performance. It's essential to diagnose the cause to ensure optimal operation.

•How can I troubleshoot current asymmetry?

To troubleshoot current asymmetry, check the connections and balance of the battery cells. Ensure that all components are functioning correctly and that there are no loose connections.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What does Error Code 85 indicate?

•How can I troubleshoot current asymmetry?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: