How to solve Error Code 25

Fault code:

【25】Short Circuit Fault

Reason:

Line installation issues: DC bus wiring errors or insulation layer damage may cause exposed wires to come into contact, which may accelerate the risk of short circuit due to humid environments.  ‌

Component failure: The edge of the photovoltaic module is burned or the connector is short circuited internally, causing ground leakage.  ‌

Equipment quality defects: Poor quality DC connectors or internal components of inverters (such as IGBT modules) have insufficient voltage resistance, which can easily cause short circuits.  ‌

External interference: Voltage fluctuations or lightning strikes in the power grid may cause system protection mechanisms to malfunction.  ‌‌

Solution:

Troubleshooting the circuit: Disconnect all input lines, use a megohmmeter to detect the resistance value of each bus to ground, and locate the short-circuit circuit.  ‌

Check the components: Focus on observing whether there are black burn marks on the edges of the photovoltaic components, and replace damaged components or connectors.  ‌

Replace parts: Use a DC connector with a higher voltage rating to repair the internally burnt IGBT module.  ‌

Insulation treatment: Insulate the exposed wires to ensure that the installation height of the equipment meets the requirements for rain and moisture resistance.  ‌

System upgrade: Update the firmware version of the inverter and optimize the overvoltage/undervoltage protection logic.  ‌

Note: Please do not dismantle the machine without permission, otherwise it will be out of the warranty of Ktech.