F23 When Using Low Power Mode < Low Batt

When using Low Power Mode you might receive a fault code F23 during start-up of the inverter as PV production commences. 

F23 Tz_GFCI_OC_Fault occurs when either a transient current or AC leakage is detected. When the inverter starts-up each day  there may be brief surges or spikes as the system stabilizes. During startup, the inverter might briefly draw or output more current than normal as it synchronizes with the grid or connected loads.

To reduce transients and their effects the following can be implemented:

1. Install Surge Protection Devices (SPDs):

Purpose: SPDs protect against voltage spikes and transient currents caused by lightning strikes, switching operations, or other disturbances.

Placement: Install SPDs on both the DC side (solar panel to inverter) and the AC side (inverter to load/grid). Make sure the SPD is rated appropriately for your system.

2. Use a Line Reactor (Inductor):

Purpose: A line reactor helps filter out transient currents by adding impedance to the circuit, which smooths out the current flow and limits rapid changes in current.

Placement: Line reactors should be installed between the inverter and the AC load (or grid connection).

3. Install a Filter (LC or LCL Filter):

Purpose: Filters are used to eliminate high-frequency components, which are often associated with transient currents.

Placement: Install an LC or LCL filter on the output side of the inverter (AC side) to reduce ripple and smooth out transients.

4. Check Grounding System:

Purpose: A proper grounding system reduces the impact of electrical transients and ensures that the inverter operates safely.

Action: Ensure your inverter and solar panel system are correctly grounded. This can also help in dissipating any transient currents.

5. Upgrade Cabling and Connections:

Purpose: Poor-quality or undersized cables can introduce more noise and transients into the system.

Action: Ensure all cables, especially between the solar panels, inverters, and grid connections, are of high quality and appropriate sizing.

6. Maintain the Inverter’s Firmware:

Purpose: Inverter firmware often contains improvements to handle transient conditions more effectively.

Action: Ensure your inverter’s firmware is up to date to benefit from the latest control algorithms that reduce transients.