BYD Battery Overvoltage Alarm – Troubleshooting &... | solardiagnostics.org

Technical Background:

The inverter monitors battery voltage to ensure it remains within safe operational limits. If the voltage exceeds the threshold, the inverter triggers an alarm to protect the battery and associated equipment. This can occur due to several factors including excessive solar array output during peak sunlight, misconfigured inverter settings, or faulty battery cells. The inverter’s internal logic is designed to prevent overcharging, which can lead to thermal runaway or permanent battery damage.

Symptoms:

When a BYD battery triggers an overvoltage alarm, users may observe a flashing LED indicator on the battery unit, accompanied by alerts on the monitoring app indicating a fault condition. Additionally, there may be a noticeable drop in energy production, as the inverter may automatically disconnect from the battery to prevent damage.

Possible Causes:

Overvoltage due to excessive solar array output, especially during peak sunlight hours.
Faulty or degraded battery cells leading to incorrect voltage readings.
Improperly configured inverter settings that do not align with battery specifications.
Connection issues such as loose or corroded terminals at the junction box or battery terminals.
External factors such as temperature fluctuations affecting battery performance.
Ground faults or insulation failures that cause voltage spikes.

Solution:

1

Use a multimeter to measure the voltage across the battery terminals to verify if it exceeds the manufacturer's specified limits.
2

Inspect all connections in the junction box and at the battery terminals for corrosion or looseness; tighten or clean as necessary.
3

Check the inverter settings to ensure they match the battery's voltage characteristics and adjust parameters if needed.
4

Conduct insulation resistance testing to identify any ground faults or insulation failures that may be causing voltage spikes.
5

If overvoltage persists, consider testing individual battery cells for degradation or failure using a battery analyzer.
6

Document findings and, if needed, consult the manufacturer's technical support for further guidance.
7

Reassess the solar array configuration to ensure it is within the voltage limits for the battery system.

Safety Warning:

Always consult a licensed electrician or certified solar installer when troubleshooting electrical systems to ensure compliance with safety regulations and standards.

Prevention:

To prevent future overvoltage alarms, regularly maintain the battery system by performing periodic checks on connections, ensuring proper inverter settings, and monitoring environmental conditions. Implementing a weather station to track temperature and irradiance can also help in adjusting the system dynamically to avoid overvoltage scenarios.

Frequently Asked Questions

•What causes a BYD Battery Overvoltage alarm?

A BYD Battery Overvoltage alarm can be triggered by excessive voltage levels due to overcharging or a malfunctioning battery management system. It's crucial to check the battery's voltage readings and system settings.

•How can I reset the alarm?

To reset the alarm, first ensure the battery voltage is within the recommended range. Then, follow the manufacturer's instructions to clear the alarm through the monitoring system or inverter interface.

BYD Battery Overvoltage Alarm – Troubleshooting & Technical Fix Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What causes a BYD Battery Overvoltage alarm?

•How can I reset the alarm?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: