21Fault

Voltronic device error 21

Soft start in battery discharge fails

Fault — the unit enters fault protection and stops normal operation until the fault is cleared — how it is shown (LED pattern or display code) depends on the model.

The exact meaning depends on your model:

InfiniSolar E 5.5KW

InverterFault

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

  1. Check if the impedance between positive and negative poles to the ground is greater than 1MΩ.
  2. If the impedance is lower than 1MΩ, please contact your installer.
  3. Please disconnect AC breaker first and then disconnect DC breaker.
  4. After LCD screen is completely off, turn on DC breaker.
  5. Until it shows "No Utility" in LCD display, turn on AC breaker.
  6. After 300 seconds, the system will automatically connect to the grid.
  7. If error message remains, please contact your installer.
  8. Check if the connection between battery and inverter is good.
  9. Make sure battery condition is ok.
  10. Then, restart the inverter.
  11. If error message remains, please contact your installer.
  12. Remove exessive loads.
  13. Be sure the total power consumption of the connected loads are less than that of the maximum which this inverter can support.
  14. Then, restart the inverter.
  15. Check if battery cable is connected firmly.
  16. If error message remains, please contact your installer.
  17. Remove exessive loads.
  18. Then, restart the inverter.
  19. Turn off the inverter.
  20. Disconnect AC circuit breaker first.
  21. Then, disconnect DC circuit breaker and then disconnect the loads.
  22. Please check if load circuit is ok.
  23. After removing the error, turn on the PV DC.

Source: InfiniSolarE-5.5KW-manual.pdf, p.44

InfiniSolar 2KW/3KW

InverterFault

Also applies to:InfiniSolar 2KWInfiniSolar 3KW

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

  1. Please disconnect AC breaker first and then disconnect DC breaker
  2. 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
  3. If error message remains, please contact your installer.

Source: InfiniSolar-2KW3KW-manual.pdf, p.48

ESS510

Energy storage systemFault

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

  1. Please disconnect AC breaker first and then disconnect DC breaker.
  2. After LCD screen is completely off, turn on DC breaker.
  3. Until it shows "No Utility" in LCD display, turn on AC breaker.
  4. After 300 seconds, the system will automatically connect to the grid.
  5. If error message remains, please contact your installer.

Source: ESS510-manual.pdf, p.69

Galleon II 6K-10K

upsFault

Also applies to:Galleon II 6KGalleon II 10KGiant Elite 1P/1P 6K-10KWinner Pro 6KVAWinner Pro 10KVA

What it means

Battery SCR short circuited — Fault code 21 shown on the display; the UPS has detected a fault condition: Battery SCR short circuited.

Cause: Battery SCR short circuited.

How to fix it

  1. Restart the unit.
  2. If the fault happens again, contact your installer or the repair centre.

Source: GalleonII-6-10K-Tower-RT-manual.pdf, p.29 · Giant-Elite-1P-1P_manual.pdf, p.26 · WinnerPro-6-10KVA_manual.pdf, p.23

Galleon X9 6K-10K RT

upsFault

Also applies to:Galleon X9 6K RTGalleon X9 10K RT

What it means

Batt SCR Short — Fault code 21 shown on the display; the UPS has detected a fault condition: Batt SCR Short.

Cause: The internal battery SCR is failed and short.

How to fix it

Contact the dealer to repair.

Source: Galleon-X9-6-10K-RT_manual.pdf, p.29

Frequently asked questions

What does error 21 mean on a Voltronic device?
It depends on the model — 7 devices use code 21. On the InfiniSolar E 5.5KW it means: Soft start in battery discharge fails. The card for each model on this page gives its exact meaning and fix.
Is error 21 a fault or a warning?
21 is a fault code: the unit enters protection and stops normal operation until it is cleared.
How do I clear or fix error 21?
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. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the InfiniSolar E 5.5KW

All InfiniSolar E 5.5KW codes

Other codes on the InfiniSolar 2KW/3KW

All InfiniSolar 2KW/3KW codes

Other codes on the ESS510

All ESS510 codes

Other codes on the Galleon II 6K-10K

All Galleon II 6K-10K codes All Giant Elite 1P/1P codes All Winner Pro 6-10KVA codes

Other codes on the Galleon X9 6K-10K RT

All Galleon X9 6K-10K RT codes

Compiled from official Voltronic user manuals. Always consult your device manual and a qualified technician before performing repairs.