So finally I managed to upload the firmware...

A successful upload was made using a 4-wire serial cable, connected as shown in this tutorial (https://youtu.be/6F5HPOZJapI?si=UaCU8iVJOkT1-UN3) using an older laptop with a serial port. I didn't have a resistor on the cable. At first I was unable to establish a connection via the serial line, but I was able to start uploading via USB to Micro USB cable quite easily. Originally, I turned on the inverter by connecting the battery. Subsequently, I switched to switching on by connecting the grid (the battery was disconnected). And now perhaps the most important trick - procedure:
1) Connect the notebook with 2 cables, a serial line and a USB to micro USB cable - leave both cables connected at the same time.
2) Start the inverter so that the PC can see the USB device.
3) Run the upgrade utility, set the upgrade via usb.
4) Start the updating and wait until it ends with an error, but we don't mind, the circle around the display will flash red.
5) Do not close the utility, but switch it to the appropriate COM port where the serial cable is connected.
6) Turn off the inverter, the inverter goes silent but the display still flashes red.
7) Turn on the inverter and within 2 or 3 seconds start the upload via the COM port. At this point, the display was already booted up and could immediately receive commands from the serial line.

As soon as the recording over the serial line started, everything came well to end and the inverter woke up with the new firmware. Tomorrow I will test how it handles all-day fog and whether the 90V bug is really removed.

So hopefully this procedure will also help someone. I don't know if this procedure ensured the connection via the COM port or if it was just luck with the timing... Anyway, I don't want to try it again
Anyway, I can confirm that the firmware works on the inverter with the original version dsp 82.01 and 122.12. now I have 82.63 + 122.12 

 

Sliva.
 

Edited November 6, 20241 yr by Sliva

hello coulomb, could you please modify fw 82.63 because my problem with 90v was not solved, but the voltage just moved a few volts higher, see attachment

The PV production is looking OK for a dismal day, except that the current threshold seems way too high, at around 0.8 A. That's assuming that your top graph is MPPT2 voltage.

I'll see how my time goes.

Thanks for the recent firmware update files.

Hi Coulomb,

last firmware published by Danilo is ok for my Voltronic Inverter ? (see pic in attachment)
Can I use original data cable that I've found with inverter or I must use 4 wires cable with resistor ?

Thanks.

Salvo.

Nuovo Immagine bitmap.bmp

Edited November 15, 20241 yr by Kaspersky

data for a full day. thank you for your time.

 

13 hours ago, Kaspersky said:

last firmware published by Danilo is ok for my Voltronic Inverter ?

Yes. all the 82.xx firmwares should be compatible with your model that has 82.05 now. The latest and the only one with the MPPT fix is 82.63. I recommend using the RAR file from this post, that keeps all the files together, and makes it less likely that the wrong file will accidentally get used.

1 hour ago, Coulomb said:

Yes. all the 82.xx firmwares should be compatible with your model that has 82.05 now. The latest and the only one with the MPPT fix is 82.63. I recommend using the RAR file from this post, that keeps all the files together, and makes it less likely that the wrong file will accidentally get used.

Thanks a lot, Coulomb.

I've appreciate your support.

I will update this post soon.

Salvo.

3 hours ago, Coulomb said:

Yes. all the 82.xx firmwares should be compatible with your model that has 82.05 now. The latest and the only one with the MPPT fix is 82.63. I recommend using the RAR file from this post, that keeps all the files together, and makes it less likely that the wrong file will accidentally get used.

Nothing to do.

Tried all possibilities, baudrate, usb/RS232 converter, compatibility mode (Win7, 8 & XP)

Always this message.

What's wrong ?

Regards.

All is done !

Uploaded firmware by USB OTG. RS232 don't work with my laptop.

MCU upload by RS232 19200 bps.

After update firmware get error 32....was crying...:-)

With MCU updated and total restart of inverter (disconnect PV and batteries) all ok.

 

Thanks so much Coulomb !!!

I just updated today my max II 10kVA inverter to 82.63 using a direct usb-c to microusb cable between my laptop and the inverter. I did not succeed with the usb drive I got error U03. with the cable I choose the usb com port and all went good.

15 hours ago, Kripton2035 said:

I just updated today my max II 10kVA inverter to 82.63 using a direct usb-c to microusb cable between my laptop and the inverter. I did not succeed with the usb drive I got error U03.

I think that using the USB menu (pressing the appropriate keys on the display) puts the USB port into host mode, where it expects to talk to a "peripheral" such as a USB stick.

Using a standard USB cable, the USB port presumably defaults to peripheral mode, so that the PC can be the host and they can communicate. 

15 hours ago, Kripton2035 said:

With the cable I choose the USB com port and all went well.

This is probably the best way to connect between PC and inverter, since there is no USB to serial adapter required, and some adapters are not compatible. However, this only works IF the reflash tool has the USB "port" option. I think that many of the reflash tools for the '2809 chip do NOT have this option. Most if not all reflash tools for the '28066 processor use the Arena reflash tool, which seems to be more recent, and has the USB  "port" option.

Edited November 17, 20241 yr by Coulomb

6 hours ago, Coulomb said:

However, this only works IF the reflash tool has the USB "port" option. I think that many of the reflash tools for the '2809 chip do NOT have this option

yes, I will certainly also update the display firmware, and the lcd upload tool does not have the usb com port possible. so I have to find a usb to serial adapter that works...

Salve, volevo sapere se anche a voi è successo che da quando ho aggiornato il FW del Max 10kw il FW 82,63 non mi funziona più dry contact. Grazie Saluti Michele 

ciao Danilo, ho il max II 10k non riesco a comunicare in alcun modo con la porta com. ma riesco a comunicare

tramite pc con la porta microusb. cè il modo di aggiornare il firmware dalla porta microusb? 

questo della foto.

sono nuovo mi sono appena iscritto.

On 2024/12/23 at 11:34 PM, Elvis411 said:

ho il max II 10k non riesco a comunicare in alcun modo con la porta com. ma riesco a comunicare tramite pc con la porta microusb. cè il modo di aggiornare il firmware dalla porta microusb? 

[ Google translation ]

I have the max II 10k I can't communicate in any way with the com port. but I can communicate

via pc with the microusb port. is there a way to update the firmware from the microusb port?

The firmware likely won't fix a complete lack of communication via the PC (RS-232) port.

* Are you using the supplied RJ-45  (this is NOT an ethernet port) to RS-232 cable?

* Is this plugged into a known-compatible USB to RS-232 cable?

As for updating via the USB port, yes, the main firmware can be updated; you need a suitable cable and a USB stick with the firmware on it, and no other files. But only the main (U1, DSP) firmware can be updated using this port. To update the display/communications firmware, you need to use the PC/RS-232 port and cables as indicated above.

Firmware update instructions for models with a round display.

On 01/11/2023 at 15:51, Danilo said:

Questo è il nuovo firmware LCD.

importante.txt mcu.esadecimale MFC42D.DLL MFCN42D.DLL MFCO42D.DLL MSVCRTD.DLL Pannello remoto_ReflashTool.exe winmm.dll

ciao Danilo, con un portatile di ultima gen sono riuscito ad aggiornare sia il firmware che il dsp. sai percaso dove 

posso trovare l'ultima versione firmware? quelle al posto del 50/53volt quella con le percentuali 20% 80% sulla batteria?

comunque per ora grazie di tutto.

buon anno nuovo a tutti

Buenos dias, alguen tiene a mano el firmware 82.07? de un axpert max 2 de 10kw?, tengo dos inversores de este tipo, y uno tiene el firmware 82.02 y el otro el 82.07, quiero paralelizarlos y no me ha funcionado,....entiendo que es por los firmware que son distintos, alguien podrá ayudarme con esto? según veo, deberia igualar los firmware al mas nuevo....pero quiero consultar con uds, si estoy en lo correcto, y si pueden compartirme las herramientas para hacerlo sin correr riesgos de bloquear nada..... desde ya muchas gracias!

2 hours ago, salvador said:

Buenos dias,

Please post in English on this forum.

Good morning, does anyone have the 82.07 firmware for a 10kw Axpert Max 2? I have two inverters of this type, one has firmware 82.02 and the other 82.07. I want to parallelize them but it hasn't worked for me... I understand that it's because the firmware is different. Can anyone help me with this? As I see it, I should match the firmware to the newest... but I want to consult with you, if I'm correct, and if you can share the tools to do it without running the risk of blocking anything... Thank you very much!

I don't have 82.07, but there is 82.06 in this thead; don't bother downloading the tmp (temporary) files, as these are automatically generated.

https://powerforum.co.za/topic/24190-new-firmware-for-axpert-max-ii-10kw/#findComment-187125

I actually doubt that the differences between 82.02 and 82.07 would prevent paralleling; it's probably some other issue (e.g. cabling). What fault code comes up when you try to parallel?

Edit: If you have trouble with the "stuck at 90 V" issue, you are probably better off updating both inverters to firmware version 82.63, which has the "presumed good" MPPT logic, and is 6 months later than 82.06. For whatever reason, 10 kW firmwares are more rare than others.

Edited April 16, 20251 yr by Coulomb

Ciao Danilo, sai se per caso c'è un nuovo firmware per l'axpert Maxii 10KW duplex? mi pare che io ho messo la 82.06 circa 2 anni fa

ciao ho inverter axpert maxii 10kw con firmware 82.63.

c'è per caso un aggiornamento?

On 2026/01/03 at 9:40 PM, Elvis411 said:

Ciao Danilo,

Please post in English on this forum.

On 2026/01/04 at 10:46 PM, Elvis411 said:

firmware 82.63

Sadly, there are very few 82.xx firmwares about. I have not seen any new ones since 82.63.

Hola, ¿Cuál es la falla de los 90Volt?, ¿cómo se presenta?

On 2026/05/18 at 9:48 AM, Ropongi said:

Hola, ¿Cuál es la falla de los 90Volt?, ¿cómo se presenta?

Please post in English here.

Hello, what is the 90V fault? How does it manifest itself?

Most factory firmwares leave the PV voltage too low even when the PV current increases enough to allow a higher PV voltage, and hence higher PV power. So the PV voltage is "stuck" at the minimum MPPT voltage, which for Axpert Max models is 90V. Other models can be stuck as low as 60V, some at 120V.

The result is lower than normal PV production. Most days, this reduces production by up to 50% or more for the first and last hours of sunlight. On cloudy days when you often need all the PV power possible, it can be reduced almost the entire day. Other days it might make little difference.

To test if it's happening, isolate the panels momentarily. Usually, PV production will then return to where it should be, with the PV voltage near the Maximum Power Point.

User Georg594 figured out patches for an older 8kW firmware, then "ported" the patches to a few other models. I've been porting these patches to several other models since.

Part of the patching involves choosing a new minimum PV voltage. That means that there isn't a "one size fits all" patched firmware for any particular model. So each patched firmware file now comes out as a set of patched firmwares.

A few factory firmwares have what I've been calling the "presumed good" MPPT algorithm. This seems to work a lot better than standard factory firmwares, but for some reason these don't seem to last and are not common. The patched firmwares seem to perform slightly better than these presumed good factory firmwares anyway. But this means that every time a new firmware is released by Voltronic, users have to choose between updating and losing the MPPT performance, or waiting until I or someone else gets around to patching the new firmware. Each patched firmware set takes me about 2 hours of work.

Edited May 20May 20 by Coulomb

On 2024/10/21 at 6:11 PM, mdaverio said:

Hello i'm new on this forum and i'm interresting to update my Axpert II 10kWh with this files. Goal : 90V issues !
But before, i would like to be sure that they are compatible with my device.

Data :
Main CPU : Firmware Version 82.02
Secondary CPU firmware version : 122.12

Hi mdaverio,
did you succeed?

I have same inverter from SP24

Elia

On 2024/05/07 at 6:37 PM, LiFePOWER said:

Is this an update to 82.06? What's it's number?

Yes, it's 82.63, which has the "presumed good" MPPT algorithm. Sorry for the extremely late response to this.