45Fault

Felicity inverter error 45 (F45)

AC output current unbalance

Also displayed as F45 on some models.

Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.

The exact meaning depends on your model:

IVPS3524P1G1-LV

InverterFault

Also applies to:IVPS5048P1G1-LVIVPS7548P2G1IVPS10048P2G1IVPS3.5~10kVA-USIVPS3-5-10KVA

What it means

AC output current unbalance — The AC output current differs too much between inverters in the parallel system.

Cause: Excessive loads, or AC input and output cables of different length or material type between inverters.

How to fix it

  1. Restart the inverter.
  2. Remove some excessive loads and re-check the load information from the LCD of the inverters.
  3. If the values are different, check that the AC input and output cables are the same length and material type.
  4. If the problem remains, contact your installer.

Source: ivps3524p1g1-lv-ivps5048p1g1-lv-ivps7548p2g1-ivps10048p2g1-manual.pdf, p.25

T-REX-3KLP1G01

InverterFault

Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01

What it means

Parallel Synchronisation Signal Abnormal

Cause: The synchronization signal shared across the parallel communication line is abnormal or missing, so the units can no longer lock their outputs together.

How to fix it

Test the parallel communication line, restart still have problems please contact the after-sales service.

Source: t-rex-3-3.6-4.6-5-6klp1g01-user-guide-english.pdf, p.39

IVEM 6048

InverterFault

Also applies to:IVEM6048

What it means

The output current of each inverter is different

Cause: Sharing cables not connected well between paralleled inverters.

How to fix it

  1. Check if sharing cables are connected well and restart the inverter
  2. If the problem remains, please contact your installer.

Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.39

IVEM8048-II

InverterFault

Also applies to:IVEM12048-IIIVEM 8K-12K Series II

What it means

The output current of each inverter is different

Cause: Output current imbalance between parallel inverters.

How to fix it

  1. Check if sharing cables are connected well and restart the inverter
  2. If the problem remains, please contact your installer.

Source: IVEM8K-12K-II_compressed.pdf, p.45

IVEM8048-LV

InverterFault

Also applies to:IVEM8048

What it means

The output current of each inverter is different

Cause: Sharing cable connection issue between paralleled inverters.

How to fix it

  1. Check if sharing cables are connected well and restart the inverter
  2. If the problem remains, please contact your installer.

Source: FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.39

T-REX-10KHP3G01

InverterFault

What it means

Synchronization data loss — Synchronization data loss between paralleled units.

Cause: Communication cables not connected well.

How to fix it

  1. Check if communication cables are connected well and restart the inverter.
  2. If the problem remains, please contact your installer.

Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.29

T-REX-10KLP3G01

InverterFault

What it means

Synchronization data loss

Cause: Communication cables not connected well.

How to fix it

  1. Check if communication cables are connected well and restart the inverter
  2. If the problem remains, please contact your installer.

Source: t-rex-10klp3g01-inverter-user-guide-english.pdf, p.29

T-REX-50KHP3G01

InverterFault

What it means

Inverter voltage fault — Inverter voltage is too high, shutdown and restart.

Cause: The inverter stage's output voltage ran above the permitted range — an internal regulation fault rather than a wiring issue.

How to fix it

  1. Power down the inverter, wait 5 minutes for capacitors to discharge, then restart.
  2. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.

Source: t-rex-25-50khp3g01-user-guide-en.pdf, p.47

Apollo-5KLP1G01-MX

Energy storage systemFault

Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2

What it means

Parallel Synchronisation Signal Abnormal

Cause: Parallel Synchronisation Signal Abnormal.

How to fix it

Test the parallel communication line, restart still have problems please contact the after-sales service.

Source: t-rex-5klp1g01-t-rex-6klp1g01-datasheet-en.pdf, p.44

Frequently asked questions

What does error 45 mean on a Felicity inverter?

It depends on the model — 9 devices use code 45. On the IVPS3524P1G1-LV it means: AC output current unbalance. The card for each model on this page gives its exact meaning and fix.

Is error 45 a fault or a warning?

45 is a fault code: the inverter cuts its output and the red LED stays solid until it is cleared.

How do I clear or fix error 45?

Restart the inverter. Remove some excessive loads and re-check the load information from the LCD of the inverters. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the IVPS3524P1G1-LV

All IVPS3524P1G1-LV codes

Other codes on the T-REX-3KLP1G01

All T-REX-3KLP1G01 codes

Other codes on the IVEM 6048

All IVEM 6048 codes

Other codes on the IVEM8048-II

All IVEM8048-II codes

Other codes on the IVEM8048-LV

All IVEM8048-LV codes

Other codes on the T-REX-10KHP3G01

All T-REX-10KHP3G01 codes

Prefer the full written guide? Read the complete Felicity inverter error-code guide

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