PV Input Current Asymmetry

What does 205 mean?

This status code indicates an asymmetry in the PV input currents, specifically relevant for the Fronius Primo GEN24 208-240 inverter when multiple parallel strings are connected to a single MPPT. This can result from differing string characteristics, partial shading, or issues with individual modules.

• Different lengths or types of solar module strings connected in parallel.
• Partial shading affecting one or more parallel strings, leading to reduced current output.
• Malfunction of individual solar modules or entire strings, causing imbalanced current contribution.

Click steps to track your progress.

1. 1

   Check the configuration of all solar module strings for consistent module types, number of modules, and equal string lengths.

2. 2

   Inspect the PV array for partial shading that might be affecting one or more parallel strings.

3. 3

   Measure the DC input currents of each individual string at the inverter's DC input terminals to identify the imbalanced string.

4. 4

   De-energize the inverter (switch off AC and DC disconnects), wait for 5 minutes, then re-energize to reset. If the message persists, the inverter may require service.