What it means
Soft start in battery discharge fails — Fault code 21 shown on the display with the fault icon on: Soft start in battery discharge fails.
Cause: Soft start in battery discharge fails.
How to fix it
- Check if the impedance between positive and negative poles to the ground is greater than 1MΩ.
- If the impedance is lower than 1MΩ, please contact your installer.
- Please disconnect AC breaker first and then disconnect DC breaker.
- After LCD screen is completely off, turn on DC breaker.
- Until it shows "No Utility" in LCD display, turn on AC breaker.
- After 300 seconds, the system will automatically connect to the grid.
- If error message remains, please contact your installer.
- Check if the connection between battery and inverter is good.
- Make sure battery condition is ok.
- Then, restart the inverter.
- If error message remains, please contact your installer.
- Remove exessive loads.
- Be sure the total power consumption of the connected loads are less than that of the maximum which this inverter can support.
- Then, restart the inverter.
- Check if battery cable is connected firmly.
- If error message remains, please contact your installer.
- Remove exessive loads.
- Then, restart the inverter.
- Turn off the inverter.
- Disconnect AC circuit breaker first.
- Then, disconnect DC circuit breaker and then disconnect the loads.
- Please check if load circuit is ok.
- After removing the error, turn on the PV DC.
Source: Voltronic manual, p.44
