E5Fault

Felicity inverter error E5

Bus Volt High

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

E-CHO-SI3KS2

InverterFault

Also applies to:E-CHO-SI5KS2E-CHO-SI8KS2

What it means

Bus Volt High — DC bus voltage high.

Cause: Internal DC bus voltage has exceeded safe limits. Usually caused by PV string voltage near the inverter's maximum DC input rating, or by a transient grid disconnection that leaves the bus charged.

How to fix it

  1. Verify total PV string voltage (Voc at coldest expected ambient) is below the inverter's maximum DC input rating.
  2. Common in cold mornings when Voc spikes 15-20% above STC value.
  3. Reduce panels per string if you are near the limit.
  4. For transient faults that self-clear, no action is needed.

Source: E-CHO-SI3KS2-Operation-Manual.pdf, p.16 · E-CHO-SI5KS2-Operation-Manual.pdf · E-CHO-SI8KS2-Operation-Manual.pdf

Frequently asked questions

What does error E5 mean on a Felicity inverter?
E5 means: Bus Volt High. Internal DC bus voltage has exceeded safe limits. Usually caused by PV string voltage near the inverter's maximum DC input rating, or by a transient grid disconnection that leaves the bus charged.
Is error E5 a fault or a warning?
E5 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 E5?
Verify total PV string voltage (Voc at coldest expected ambient) is below the inverter's maximum DC input rating. Common in cold mornings when Voc spikes 15-20% above STC value.

Related error codes

Other codes on the E-CHO-SI3KS2

All E-CHO-SI3KS2 codes All E-CHO-SI5KS2 codes All E-CHO-SI8KS2 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.