I bought a Voltronic 11kw twin with round display, main CPU Firmware Version 00075.04 and Second CPU Firmware Version 00039.09 and it seems that it has the 90V issue.

Is there another firmware compatible with this version?

On 2024/04/20 at 4:20 AM, Dany said:

Is there another firmware compatible with this version?

Voltronic doesn't know how to fix this issue properly.

Unfortunately, I've not seen any 75.xx firmwares for the Axpert Max II 11 kW Twin, so I'm not able to patch it for the MPPT issues.

thank you for your answer ! I wish you all the best! 

On 21.04.2024 at 18:12, Coulomb said:

Voltronic не знає, як правильно вирішити цю проблему.

На жаль, я не бачив жодної прошивки 75.xx для Axpert Max II 11 kW Twin, тому я не можу виправити проблеми з MPPT.

On 4/21/2024 at 6:12 PM, Coulomb said:

Voltronic doesn't know how to fix this issue properly.

Unfortunately, I've not seen any 75.xx firmwares for the Axpert Max II 11 kW Twin, so I'm not able to patch it for the MPPT issues.

Hi everyone,

I am facing the notorious MPPT stuck bug on my Voltronic Axpert Max II inverter and am looking for a firmware update or a patched version to fix it.

My current system specifications:

• Inverter: Axpert Max II

• Main CPU Firmware: 75.01

• Secondary CPU (HMI) Firmware: 39.06

• PV Array: 11 panels in a single series string (Vmp is around 37V per panel, total Vmp under load is approx. 407V).

The Problem:

Even though my total string voltage under load should ideally sit around 400V, the MPPT tracker regularly drops down and gets stuck at exactly 90V (the absolute minimum PV threshold). When this happens, PV production drops to almost zero (10-50W).

A manual PV disconnect/reconnect via the circuit breaker forces a rescan and brings the voltage back to normal, but it gets stuck at 90V again as soon as there is a passing cloud or a shift in solar irradiance.

Could anyone please share a newer factory firmware or a stable patched firmware for the 75.XX series that resolves this MPPT scanning/freezing issue?

Any help, links, or advice would be greatly appreciated. Thank you!

Patched firmware version x75.85:

https://forums.aeva.asn.au/viewtopic.php?p=106587#p106587