In some versions, yes. Later VM III firmware reduces the no-load draw from ~50W to ~35W when in power-saving mode. Check your distributor’s release notes.
This monograph reviews the Axpert VM III firmware: its architecture, components, features, configuration, upgrade and troubleshooting procedures, customization possibilities, and operational considerations. It is written to be vendor-neutral where possible but acknowledges behavior observed in common Axpert-series inverters/UPS systems (commonly sold under names like Voltronic Power / MPP Solar variants). Use this as a technical reference for administrators, integrators, and advanced users. axpert vm iii firmware
Follow the specific method documented by your inverter’s manual. In some versions, yes
If you need help with a (e.g., writing the methodology, generating tables of register mappings, or formatting for a conference template like IEEE), just let me know and I can expand that part in detail. This monograph reviews the Axpert VM III firmware:
The Axpert VM III is not the same as the Axpert King, Axpert VM II, or Axpert MKS. Firmware for those models will brick a VM III. Always ensure the filename includes "VM III" or matches the correct hardware revision (often labeled on the side sticker).
Communities like Power Forum or DIY Solar Forum often archive firmware versions (like the popular 41.xx or 91.xx branches), but proceed with caution.