Battery SOC Low Alarm
Also displayed as F20 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:
Also applies to:IVGM6KL-P1G1IVGM7K6L-P1G1IVGM8KL-P1G1
Battery SOC Low Alarm — Battery SOC is too low, battery should be recharged.
Cause: The battery's reported state of charge has dropped to the low-SOC alarm threshold, so there is little usable energy left in the pack.
Recharge the battery.
Source: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.51
Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01
Input output reverse
Cause: The AC input and output wiring are swapped — the inverter detects source voltage on its output terminals, so it refuses to run until the connections are corrected.
Confirm that the input and output wiring is correct.
Source: T-REX-3_3.6_4_4.6_5_6KLP1G01-hybrid-inverter-user-guide-English.pdf, p.38
Also applies to:IVEM6048
Over temperature happen at inverter circuit
Cause: The temperature of internal inverter component is over the limitation.
Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.
Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.37
Also applies to:IVEM12048-IIIVEM 8K-12K Series IIIVEM8048-LVIVEM8048
Over temperature happen at INV circuit
Cause: The temperature of internal INV component is over the limitation.
Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.
Source: IVEM8K-12K-II_compressed.pdf, p.43 · FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.38
Input output reverse — Input and output wiring is reversed.
Cause: The AC input and output wiring are swapped — the inverter detects source voltage on its output terminals, so it refuses to run until the connections are corrected.
Confirm that the input and output wiring is correct.
Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.28
Battery 1 software overcurrent fault — Battery 1 current is too large, check the battery charge and discharge power.
Cause: The control firmware measured battery 1 current above the protection limit — charge or discharge power beyond what that battery channel is rated for.
Source: T-REX-50KHP3G01-user-manual-.pdf, p.46
Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2
Input output reverse — Input and output wiring reversed.
Cause: Input output reverse.
Confirm that the input and output wiring is correct.
Source: Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf, p.43
Output overcurrent — Fault event: total output overcurrent condition.
Cause: Total output current exceeded the protection limit — the connected loads exceed the unit's rating, or the output wiring has a short.
Source: LUX-S-1600LG01.pdf, p.22
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.