Pylontech Error Code 72 – Meaning, Causes & Solution -... | solardiagnostics.org

Technical Background:

The Error 72 is triggered when the inverter detects an imbalance in current sharing among the battery modules. This can occur when the battery management system (BMS) identifies that one or more modules are not contributing equally to the overall system output, potentially due to differences in state of charge (SOC) or faulty communication signals. The inverter relies on precise readings from the BMS to ensure safe operation and efficiency; a significant deviation in current flow can lead to overheating, over-discharge, or damage to the battery modules.

Symptoms:

When experiencing a Pylontech Error 72, users may observe a combination of visual and system alerts. The LED indicators on the battery modules may flash in a specific pattern, typically indicating a fault condition. Additionally, monitoring apps may display alerts regarding current sharing issues, and there may be a noticeable drop in system performance or energy production as the inverter reduces output to protect the system.

Possible Causes:

Imbalance in current sharing between battery modules due to unequal state of charge (SOC).
Faulty communication between the battery management system (BMS) and the inverter.
Poor connections at the junction box or terminal connections leading to increased resistance.
Overheating of battery modules causing thermal protection to activate.
Firmware issues in the BMS that may require updates or resets.

Solution:

1

Inspect all battery connections at the junction box and ensure they are tight and corrosion-free using a multimeter to check for resistance.
2

Verify the SOC of each battery module using the monitoring app or BMS interface and equalize them if necessary.
3

Check for any firmware updates available for the BMS and apply them as needed to address potential software issues.
4

Monitor the temperature of the battery modules to ensure they are within operational limits and not overheating.
5

If communication issues are suspected, perform a reset of the BMS and reconnect it to the inverter to re-establish communication.
6

Conduct a full inspection of the inverter settings to ensure proper configuration for the battery system.

Safety Warning:

Always consult a licensed electrician or certified solar installer when troubleshooting electrical components to ensure safety and compliance with local codes.

Prevention:

To prevent Error 72 in the future, regularly maintain the battery system by checking connections, ensuring modules are balanced in SOC, and keeping the firmware updated. Regular thermal checks can help identify potential overheating issues before they trigger faults. Additionally, consider implementing a routine inspection schedule to catch any early signs of wear or communication issues.

Frequently Asked Questions

•What does Pylontech Error Code 72 indicate?

Pylontech Error Code 72 indicates a current sharing fault, which can affect battery performance. It is essential to diagnose the underlying issue to ensure optimal operation.

•How can I troubleshoot a current sharing fault?

To troubleshoot a current sharing fault, check the connections and settings of the battery system. Ensure that all batteries are functioning correctly and are properly balanced.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What does Pylontech Error Code 72 indicate?

•How can I troubleshoot a current sharing fault?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: