Hello everyone I am new in photovoltaics and I have just acquired an inverter, does it exist a up to date firmware for the Max II 11 kW Twin ?
Mine was shipped with the version 75.00 for the Main CPU and 39.04 for the secondary CPU.

There are some bugs like the management of the second output which does not cut off when the voltage is lower than the setpoint. There is also the clock that loses minutes...!? But not all the time, I do not understand.

it remains a little "stuck" at 90 volts, but as soon as there is a little sun the voltage rises. at the moment I only have 220 volts DC(7s) at the solar panels, shortly I will have more than 400 volts (10/11s) and the voltage should rise faster. when I'm in SUB mode, even though the panels output enough, I'm still drawing 100/150 watts from the grid. Why ?

thanks in advance any help/informations/firmware about this inverter/voltronic will be appreciated

4 hours ago, Br999 said:

does it exist a up to date firmware for the Max II 11 kW Twin ?

No, I've not seen any.

4 hours ago, Br999 said:

when I'm in SUB mode, even though the panels output enough, I'm still drawing 100/150 watts from the grid. Why ?

I think that's so that when a smallish load drops off, which happens quite often, there isn't a burp of energy back into the AC-in port, until the control system adjusts itself to the new load. I guess that when larger loads drop off, there will still be such bursts of energy pushed into the utility, but hopefully these will be less frequent.

In more up-market inverter brands, I believe that you can change the amount of this "safety buffer" with a setting. It seems to be the price to pay for the convenience of being able to blend utility and solar power.

hello thank you for these answers, I will continue to understand the operation of this inverter. for the clock I have the impression that in fact when you are in the menus it stops, last night I did not touch the inverter and this morning it is always on time!

for consumption in SUB mode it's amazing because in SBU mode I'm at less than 10 watts.

I still have the problem of the L2 output, it's a shame because I was planning to use it to operate my water heater

thank you for your help and time spent assisting users on this forum

On 30.11.2022 at 3:37, Coulomb said:

Nu, nu am văzut niciunul.

Cred că, atunci când o sarcină mică scade, ceea ce se întâmplă destul de des, nu există un eruc de energie înapoi în portul AC-in, până când sistemul de control se adaptează la noua sarcină. Bănuiesc că atunci când încărcăturile mai mari scad, vor exista în continuare astfel de explozii de energie împinse în utilitate, dar sperăm că acestea vor fi mai puțin frecvente.

În mai multe mărci de invertoare de top, cred că puteți modifica cantitatea acestui „tampon de siguranță” cu o setare. Se pare că este prețul de plătit pentru confortul de a putea combina utilitatea și energia solară.

Have u met axpert max 2 11k twin firmware yet? Can change the 90v problem ?

18 hours ago, add1c7ed55 said:

Have u met axpert max 2 11k twin firmware yet? Can change the 90v problem ?

No, sorry, I have an electric vehicle on-board charger project that is taking up a lot of time at present. [ Edit: My apologies, I meant I have no patched firmware ready as of now. ]

Edit: Though a recent charger repair is finished. It was a monster of a repair, even though the fault itself was simple. Some things really aren't designed for serviceability.

Edited March 1, 20233 yr by Coulomb

Firmware for Easun 11kw (Tested!)

MAX11K_TWIN_DSP_6407.7z Remote Panel_Reflash_MCU(38.06).rar

I note very belatedly that the above are for the

Axpert Max E 11kW '2809 Twin; the OP likely has an

Axpert Max II 11kW '28066 Twin.

So 2 out of 4 variables correct (11kW, Twin), but 2 incorrect for the OP (E versus II, '2809 versus '28066).

I have not seen any firmwares for the Axpert Max 11kW '28066 ('2809 or '28066, Twin or non-Twin).

This is patched firmware versions x65.08 for the Axpert Max II 11 kW '2809 Twin, based on factory firmware version 65.08. Do not use with any other model. Use at your own risk. They fix the premature float bug, and change the value seen by monitoring software to 00x65.08. They implement all of Georg594's MPPT patches. Both MPPTs are set to the same minimum voltage.

265.08 has a minimum MPPT voltage of 200V.

165.08 has a minimum MPPT voltage of 150V.

965.08 has a minimum MPPT voltage of 90V (no change from the original; use only if you have a very number of panels per MPPT).

The reflash tool only reads from the file dsp.hex. To use one of the variants other than the 200V MPPT minimum, delete dsp.hex; copy and paste the desired hex file; rename the resultant to dsp.hex. Start the reflash tool again.

Firmware upload instructions for models with a round display.

dsp_x65.08_patched.zip

Edit 18/Jan/2025: Added MSVCRTD.DLL to the zip file. The 1.25MB version had this file missing. Sorry for the hassle.

 

Edited January 18, 20251 yr by Coulomb

Hello everyone. I want to ask Coulomb. I have a MAX II 11000 inverter. Coulomb helped me update the firmware and make a TWIN from it. Now the question arises. I have firmware 64xxx. As far as I understand, this is from MAX E with a home display, and I have a large round display. The firmware version 65xxx, as I understand it, is specifically for MAX II 11000 TWIN for a large round display. The question is whether I can flash it to version 65xxx. So as not to get error  90.

Edited January 8, 20251 yr by YRIIY

On 2025/01/09 at 8:28 AM, YRIIY said:

As far as I understand, this is from MAX E with a home display, and I have a large round display. The firmware version 65xxx, as I understand it, is specifically for MAX II 11000 TWIN for a large round display.

Yes.

On 2025/01/09 at 8:28 AM, YRIIY said:

The question is whether I can flash it to version 65xxx. So as not to get error  90.

It sounds like you should be running a 65.xx rather than a 64.xx, yes.

But that won't fix fault code 90, as far as I know.

I have a patched firmware version 865.08, based on factory firmware version 65.08, to work around the fault code 90 issue. Did I not send it to you? I had a quick search through my private messages (there are a LOT), and didn't see your name come up other than a thank you note around Christmas eve.

It's possible that I patched it for someone else with a similar problem.

Edited January 10, 20251 yr by Coulomb

No, you didn’t give it to me. It wasn’t me. I bought my inverter with firmware 64.03. But I have a large round display. . And I just updated it to version 64.62. But this is the firmware for the MAX E TWIN. And when I found this topic, it turns out that I should have version 65..... Since I also have TWIN. And if I reflash my inverter to version 65.... I won’t get error 90. Or serial their numbers are the same. My S/N is 96342205601236 And will I lose my serial number after updating the firmware to 65.... version.

56 minutes ago, YRIIY said:

No, you didn’t give it to me. It wasn’t me.

There are so many... sorry!

Interesting that there may be a firmware or hardware fault with these units.

56 minutes ago, YRIIY said:

I bought my inverter with firmware 64.03. But I have a large round display.

My guesses are that maybe this is a clone (but it doesn't seem to be), or this is one of those resellers where Voltronic gives the reseller more freedom to assemble and customise their inverters, including the firmware. And in this case, the reseller mistakenly shipped this (batch of) inverter(s) with 64.xx instead of 65.xx.

56 minutes ago, YRIIY said:

And I just updated it to version 64.62. But this is the firmware for the MAX E TWIN. And when I found this topic, it turns out that I should have version 65.....

It turns out that 65.08 (see next post) is from about the same time as 64.62. 65.08 doesn't have what I have been calling the "presumed good" MPPT logic, but recently I've decided that I have more to learn about that subject.

56 minutes ago, YRIIY said:

Since I also have TWIN. And if I reflash my inverter to version 65.... I won’t get error 90.

That's not certain, as the EEPROM contents might be laid out differently in the two firmwares. But since they are released at about the same time (mid 2023), I think that the changes of that are slight.

If you end up with fault code 90, I can send the patched firmware to work around it, as I already have it prepared. I don't release firmwares publicly that work around fault code 90, so as not to encourage the cloners, or to be accused of helping them.

56 minutes ago, YRIIY said:

Or serial their numbers are the same. My S/N is 96342205601236 And will I lose my serial number after updating the firmware to 65.... version.

You should retain your serial number, as it's one of the first things stored in the EEPROM, so its address likely won't change.

This is factory firmware version 65.08 for the Axpert Max II 11kW '2809 Twin. Do not use with any other version.
Use at your own risk. The hex file is dated 25/7/2023.

Firmware upload instructions for models with a removable display.

dsp 65.08 Axpert Max II 11kW Twin.7z

14 hours ago, Coulomb said:

Это заводская версия прошивки 65.08 для Axpert Max II 11kW '2809 Twin. Не используйте с другими версиями.
Используйте на свой страх и риск. Hex-файл датирован 25/7/2023.

Инструкции по загрузке прошивки для моделей со съемным дисплеем.

dsp 65.08 Axpert Max II 11 кВт Twin.7z 1.01 МБ · 0 загрузок

OK. I understand you. So it's time to try. I'll keep you informed.
And if possible, give me Firmware 865.08 just in case, in my personal messages.

10 hours ago, YRIIY said:

if possible, give me Firmware 865.08 just in case, in my personal messages.

Done.

Hello everyone. I am writing a report. I flashed my inverter from 64.62 to 65.08. Everything seems to be fine. The serial number remained the same. I flashed it with the original firmware. Question for Coulomb. When I tried to reflash it with the patched firmware 965.08 from Coulomb, when I started the program, it gave me an error: the program cannot be started, MSVCRTD is missing. DLL. I took this file from the original firmware, copied it to the patched folder, and it was possible to flash it without errors. Maybe you missed something in the patched firmware.

22 hours ago, YRIIY said:

Maybe you missed something in the patched firmware.

One of the DLLs must not have selected when I copied, sorry. I usually test the reflash tools for just this sort of error, too. Sigh.

The zip file has now been corrected; the good file is 1.4 MB, the bad one 1.25MB.

Thanks for the report.

 

Edited January 18, 20251 yr by Coulomb
Added link.

Hello. I have another question. WatchPower shows the country of regulation as India. How can I change it to Ukraine? Because the control timer time does not match a little. It turns on 1 hour ahead. And another question about the power button. It needs to be redone. Now when the button is off it lights up, but when it is on it does not light up. And now it turns out that I turn off the sun. I turn off the network. Then I turn off the power button, it still works. It turns off when I disconnect the batteries.

18 hours ago, YRIIY said:

WatchPower shows the country of regulation as India.

Are you sure that you're not running SolarPower (for on-grid models)? I can't see why Watchpower would indicate a country of regulation, or where it would get this information from. In any case, this will not affect the time; check the time that the inverter thinks it is. There must be a way to set the time for your area.

18 hours ago, YRIIY said:

Then I turn off the power button, it still works.

My understanding is that with the power switch off, the inverter will remain on (display backlight, LEDs etc) if there is a power source (AC-in or PV in). The AC-out port should be unpowered immediately that the power switch is off. If there is no AC-in and no PV in, then the inverter should power down completely after a delay of some 30-60 seconds; not immediately.

Hello everyone. And so after reflashing the inverter from version 64.xxx to 65.xxx, observations over two weeks have shown. The inverter power button should be without fixation. Mine had a fixation and therefore, in order to turn it off, I had to turn the button off and on again. And there is another interesting point. For two weeks, it is unclear why it turned off the output load itself four times at different times. That is, the output to the house. There were no errors.
Does anyone have any information about the shutdown?

On firmware 64.xxx The button with a lock when turned on turns on the inverter, the time is counted and the inverter turns on the output load. When turned off, the inverter turns off the load and after some time turns off completely.

On firmware 65.xxx The same button. I press the button, the inverter starts, the load turns on as usual, it goes into working mode. But when turning off there are changes. To turn it off, you need to turn off and turn on the button. That's where the conclusion about the button without fixation comes from. It turns off the load, but does not want to turn off completely. It continues to work from batteries. And when the batteries are turned off, it turns off. But when the batteries themselves are turned on, the inverter starts only after pressing the button.
Who can tell me the correct operation of firmware 65.xx

Hi to all !! This is screen shot from a probably clone axpert max E 11K Twin

Only the display panel and his firmware is that of an axpert 7k2 non twin

Serial number 96342205601236 is the same of mine

may be this when clones?

Are you saying that you have two invrrters with the exact same serial number?

I suppose some clones might do that.

On 2025/01/10 at 10:42 AM, Coulomb said:

On 2025/01/10 at 9:30 AM, YRIIY said:

Or serial their numbers are the same. My S/N is 96342205601236 And will I lose my serial number after updating the firmware to 65.... version.

Hy Coulomb yes Serial number 96342205601236 is the same of mine

axpert max E 11K twin 2809 .... sure clone..