SOFAR (Shenzhen SOFARSOLAR) · PV inverters · SOFAR 3.3–12KTLX-G3 (three-phase grid inverter)
ID114Frequency derating
Name in the manufacturer's documentation (fault list): Frequency derating
[1]
In plain words (editorial)
The inverter reduces its output because of the grid frequency (frequency derating). If it occurs frequently, the manual says to check whether the grid voltage and frequency are within the inverter's allowable range and whether the AC-side breaker and output cable are connected properly.
When to call a service technician: If the grid is out of range, contact Sofar customer service via your installer.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Steps given by the manufacturer (source text)
- If it occurs frequently, please check whether the grid voltage and grid frequency are within the allowable range of the inverter[2]
- If not, please contact the customer service of SOFARSOLAR[3]
- If yes, please check whether the connection between the circuit breaker at the AC side and the output cable is normal[4]
- If the grid voltage and grid frequency are within the allowable range of the inverter, and the AC side wiring is confirmed to be correct, the alarm still appears frequently With the approval of the local power operator, please contact the customer service of SOFARSOLAR to modify the protection points of over / under voltage and over / under frequency of inverter grid[5]
⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.
The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →
Sources
Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.
- [1] SOFAR 3.3~12KTLX-G3 – User Manual (2024-10) , p. 73 official manufacturer document quote verified
Frequency derating
- [2] SOFAR 3.3~12KTLX-G3 – User Manual (2024-10) , p. 73 official manufacturer document quote verified
If it occurs frequently, please check whether the grid voltage and grid frequency are within the allowable range of the inverter
- [3] SOFAR 3.3~12KTLX-G3 – User Manual (2024-10) , p. 73 official manufacturer document quote verified
if not, please contact the customer service of SOFARSOLAR
- [4] SOFAR 3.3~12KTLX-G3 – User Manual (2024-10) , p. 73 official manufacturer document quote verified
if yes, please check whether the connection between the circuit breaker at the AC side and the output cable is normal
- [5] SOFAR 3.3~12KTLX-G3 – User Manual (2024-10) , p. 73 official manufacturer document quote verified
if the grid voltage and grid frequency are within the allowable range of the inverter, and the AC side wiring is confirmed to be correct, the alarm still appears frequently With the approval of the local power operator, …