Hello, I have noticed that my Axpert Max 8000 loads power to the grid. According to the seller, I should upgrade firmware to min. 90.11 or newer. Where can I download it?

Driver Axpert Max

Monitoring connection

Serial number 92932206100440

Firmware version 72.03

Model name MKS2-8000

Model number 44

Machine type Off Grid

On 2025/05/09 at 3:31 AM, alexisis said:

According to the seller, I should upgrade firmware to min. 90.11 or newer. Where can I download it?

Err, 90.11 is for 7.2 kW Maxs, and is very old firmware, much older than your 72.03.

The latest firmware for your model is 72.08, although 72.75 is only a little older, and has the "presumed good" MPPT logic (should get stuck at 90 V much less often).

These firmwares are available here:

On 2025/05/08 at 7:31 PM, alexisis said:

Hello, I have noticed that my Axpert Max 8000 loads power to the grid. According to the seller, I should upgrade firmware to min. 90.11 or newer. Where can I download it?

Driver Axpert Max

Monitoring connection

Serial number 92932206100440

Firmware version 72.03

Model name MKS2-8000

Model number 44

Machine type Off Grid

hi Alexisis,

IF we are talking Max II, 8oooW, then the latest firmware is 81.08 and 22.25 for the display.
I have both official versions if you want them.

They also allow to programs 12 & 13 in SOC%.

However the apps do not seem to follow this.
Is there anyone who knows of an App that will allow to change the settings in SOC% instead of Voltage? (Not WatchPower, not Energy-Mate, nor Dessminitor can do it.)

Greetings, Kurt

46 minutes ago, Kurtbe said:

Is there anyone who knows of an App that will allow to change the settings in SOC% instead of Voltage? (Not WatchPower, not Energy-Mate, nor Dessminitor can do it.)

Hi @Kurtbe You can set this via the SolarAssistant solution (this is a monitoring system based on a raspberry pi, solar-assistant.io for details) via custom rules 😉

At you disposal if required

Best Regards

On 2025/05/20 at 3:33 PM, fhocorp said:

Hi @Kurtbe You can set this via the SolarAssistant solution (this is a monitoring system based on a raspberry pi, solar-assistant.io for details) via custom rules 😉

At you disposal if required

Best Regards

Thank you for the advice, but I am afraid that taht is a little out of my leage.
Kind regards, Kurt

43 minutes ago, Kurtbe said:

Thank you for the advice, but I am afraid that taht is a little out of my leage.
Kind regards, Kurt

No problem, if you need help i am at your disposal 😄

Best Regards

On 5/8/2025 at 7:31 PM, alexisis said:

Hello, I have noticed that my Axpert Max 8000 loads power to the grid. According to the seller, I should upgrade firmware to min. 90.11 or newer. Where can I download it?

Driver Axpert Max

Monitoring connection

Serial number 92932206100440

Firmware version 72.03

Model name MKS2-8000

Model number 44

Machine type Off Grid

No firmware can solve the problem of charging the network. Unfortunately, this is a feature of the inverter when a large consumer suddenly stops. SBU mode is the only solution. :(

On 2025/05/26 at 10:31 AM, fhocorp said:

No problem, if you need help i am at your disposal 😄

Best Regards

Thank you. Very kind.

On 2025/02/03 at 3:54 PM, Coulomb said:

Alas, no. I have no 75.xx for Axpert Max II 11kW '28066 Twins, and only one Max II 11kW firmware at all (65.08, dated July 2023, older than your inverter).

One day I'll try again to make a '28066 firmware from a '2809 firmware; I tried once but I don't think it worked well. I'm suspecting a difference in clock speed now; that should be easy enough to check. But I have way too much on my plate at present, sorry.

Can i tray the 65 firmware over the 75 whitout problem, like brick the inverter.?

1 hour ago, dorin said:

Can I try the 65 firmware over the 75 without problem, like brick the inverter.?

My understanding is that it will work, but you won't call the calibrate function that is burned into your processor's Read Only Memory, and your readings may be inaccurate as a result. I don't know the consequences of that.

So I don't recommend it, but my guess is that it won't be a disaster.

Going the other way (attempting to use a '28066 firmware on an inverter with a '2809 processor) almost certainly WILL brick the inverter. It will attempt to call a calibrate function in non-existent (or at least unprogrammed) Read Only Memory, and this is very early on before even interrupts are enabled.

Please help me. I have an Axpert Max II 8kW. I updated it to version 81.63, but it gave me error 32 and I don't know what to do.

On 2025/09/20 at 11:21 PM, reza.sh said:

I have an Axpert Max II 8kW. I updated it to version 81.63, but it gave me error 32

That means that the display firmware no longer talks to the main firmware.

What was the main firmware before the update? You might be attempting to use the wrong firmware.

It might also just be a glitch due to the cheap and sometimes slow opto-couplers.

See If You Think Your Inverter is Bricked.

Edited September 25, 2025Sep 25 by Coulomb

Hi Coulomb,

after my post "Axpert Max II, 10kW" I just tried the

"dsp 281.05 Axpert Max II 8kW patched firmware.zip 281.05" on

my device "MAX II 8kW and 28066 processor, round display" with 281.02 firmware

On the USB-stick I renamed MAXII8K 281.05 patched.inv -> mks2.hex

After UPG - YES - the diyplay shows U03 in red letters and the ring changed to red

On 2025/09/20 at 4:51 PM, reza.sh said:

Please help me. I have an Axpert Max II 8kW. I updated it to version 81.63, but it gave me error 32 and I don't know what to do.

I restarted and it was solved, but now I've found another problem and I'm getting error f09.

hello there ,

you seem to know a lot about the voltronic inverters and if you could help me out i would be really grateful
i have a Axpert MAX II TWIN 8KW with firmware version 54.01
i have connected a lithium battery through BMS to the inverter ..

first problem is the WIFI no longer works

second i cant change the settings in the inverter menu on the touch screen ... and the cut off voltage is in V not in percentage and i cannot change it manually

the inverter is stuck in ad5 and cant be changed

i was thinking of upgrading the firmware ... but not sure after reading the posts here i am confused
there r multiple firmware versions? different firmwares for the CPU and the touch screen?

is there anywhere a video i can use to follow for that or a step by step guide?

i work with computers and know my way around ... but the inverters is a first for me .. so don't want to brick it
any help is appreciated

Hi @rabihhatem

23 minutes ago, rabihhatem said:

first problem is the WIFI no longer works

check the cable if it is not disconnected

28 minutes ago, rabihhatem said:

second i cant change the settings in the inverter menu on the touch screen ... and the cut off voltage is in V not in percentage and i cannot change it manually

If you use the BMS cable for your battery, the inverter battery settings are set by the battery BMS only. If you want to set it manually, you have to disconnect the BMS cable between your inverter and the battery.

30 minutes ago, rabihhatem said:

the inverter is stuck in ad5 and cant be changed

Could you send us a picture of the inverter screen ?

32 minutes ago, rabihhatem said:

i was thinking of upgrading the firmware ... but not sure after reading the posts here i am confused
there r multiple firmware versions? different firmwares for the CPU and the touch screen?

they are different firmware for the inverter and the touchscreen, depending on your model of inverter. But based on your issue, the firmware upgrade is not necessary.

33 minutes ago, rabihhatem said:

is there anywhere a video i can use to follow for that or a step by step guide?

They are toturials available on the forum if required. Use it at your own risk.

34 minutes ago, rabihhatem said:

i work with computers and know my way around ... but the inverters is a first for me .. so don't want to brick it
any help is appreciated

At your disposal ;)

Cheers

2 hours ago, fhocorp said:

Hi @rabihhatem

check the cable if it is not disconnected

If you use the BMS cable for your battery, the inverter battery settings are set by the battery BMS only. If you want to set it manually, you have to disconnect the BMS cable between your inverter and the battery.

Could you send us a picture of the inverter screen ?

they are different firmware for the inverter and the touchscreen, depending on your model of inverter. But based on your issue, the firmware upgrade is not necessary.

They are toturials available on the forum if required. Use it at your own risk.

At your disposal ;)

Cheers

hello and thanks for the quick reply

the cable is connected the 3 green lights of the wifi are on and the BMS is working correctly and communicating with the inverter.

i will attach images .

the problem is and what i found online.... is that the inverter uses the same module for bms and wifi... so only one of them can be active at a time

but even if i disconnect the bms and power cycle i can't access the menu and the inverter is stuck at the bms mode ED5 ... cant change Cut off voltage (should be percentage i think) it is stuck at 48v ... and the batteries are being completly drained ...

i have contacted the BAttery Supplier (Batteries are Dyness 14.33kw) and he said the switch from battery to utility should be done at the inverter level not the battery/bms level

the batteries are connected corretly and the DIP is 0100 on master and 0000 on slave

the inverter firmware i have is 54.01 ...

Edit. i think the correct menu number is 36 Ad5

Edited November 23, 2025Nov 23 by rabihhatem

I am willing to help, but if I read correctly this is about an Axpert MAX II TWIN 8KW, I own a Axpert MAX II (not twin) 8kW, so I guess I am of little use to you...

On 2025/11/28 at 7:36 PM, Kurtbe said:

I am willing to help, but if I read correctly this is about an Axpert MAX II TWIN 8KW, I own a Axpert MAX II (not twin) 8kW, so I guess I am of little use to you...

Hi

Hope you can help ... And no it is not twin from what I got to realize...

On 2025/11/23 at 9:23 PM, rabihhatem said:

the inverter is stuck in ad5 and cant be changed

That's "Ads" (equalisation Activation DiSabled). It's because you're not declaring a flooded battery; equalisation only makes sense for flooded batteries. So just ignore settings 30-36.

On 2025/11/23 at 9:23 PM, rabihhatem said:

i was thinking of upgrading the firmware ... but not sure after reading the posts here i am confused
there r multiple firmware versions? different firmwares for the CPU and the touch screen?

Yes, it's confusing. Yes, there are different firmwares for the main (U1, DSP) firmware and the display (U2) firmware. There is also different firmware for the touch and button removable displays, as well as the colour versus removable displays. The ability to set three settings in SoC% depends on both the main and display firmwares.

The latest 54.xx firmware I know of is 54.06, available here.

For the display firmware, I'm guessing it's 22.xx, but please post your present display (U2) firmware version to be sure. Updating both will likely fix most of your problems.

Sorry for the late response.

Edit: Oops; I assumed that the latest 54.06 firmware would support the QDOP command, but in fact on checking just now, it does not. To get that to work, you will need an even later firmware; ask whoever sold you your inverter. Sorry for the false hope.

Edited December 10, 2025Dec 10 by Coulomb

On 2025/12/08 at 9:08 AM, rabihhatem said:

Hi

Hope you can help ... And no it is not twin from what I got to realize...

Because of the difference between the TWIN an not TWIN version, I run on quite different frimware.
22.25 for the display and 81.08 for the inverter (So nothing like the 54.xx that you need.). Therefor this software is not applicable to your system.
I can however confirm that this version does allow SOC% settings. But only via the display of the converter itself. APPS like Watch Power, Energy Mate and Dessmonitor via a browser still will NOT work with SOC%.

As an example: these are my settings:

in numeric order
1	SBU= Solar, Batt, Utility (mains)
2	80: defined by Pylontech 5000. I put 50 (2400W)
3	input voltage range: UPS (tranfer =15ms, APL =20ms)
5	battery type: (PYL) 'USE' allows '13' to go below 51V
6	restart enable
7	restart enable
9	output frequency: 50
10	output voltage: 230
11	Maximum charge from grid (utility): 30Ax48V=1440W
12	sets dry-contact @30% SOC=>grid
13	sets dry-contact @50% SOC=>battery
16	Source: SNU (solar&grid) but grid only if timer 'on'.
18	alarm control: on
19	return to default screen: on
20	backlight control: on
22	beeps if source is cut off: on
23	Bypass enable=return to grid @ batt. overload
25	record faults: enable
26	bulk charging Volt: 53,2V, (by Pylontech)better=52,4
27	floating charge Volt: 53,2V (by Pylontech) Better=52,4
28	AC output mode: SIG (single phase)
29	Shut down @10% SOC '05'=PYL 47,9V when 5=USE
30-36	Not needed for Li-Ion Batteries
37	not reset data
41	Max. batt. Discharge= dds (disable)
82	12V output on/off
83	erase data log
84	data log interval:		10=6/hr=144/d=10 days
			20=3/hr=72/d=20 days
			30=2/hr=48/d=30 days
			60=1/hr=24/d=60 days
85-89	Time and date
91-98	LED's. 96:orange, 97:blu, 98: green
99	Timer for output source priority
100	Timer charge source: solar 1st (CSO):00-00,Solar+grid (SNU):00-00,only solar (OSO):00-00

On 2025/12/10 at 7:47 AM, Coulomb said:

That's "Ads" (equalisation Activation DiSabled). It's because you're not declaring a flooded battery; equalisation only makes sense for flooded batteries. So just ignore settings 30-36.

Yes, it's confusing. Yes, there are different firmwares for the main (U1, DSP) firmware and the display (U2) firmware. There is also different firmware for the touch and button removable displays, as well as the colour versus removable displays. The ability to set three settings in SoC% depends on both the main and display firmwares.

The latest 54.xx firmware I know of is 54.06, available here.

For the display firmware, I'm guessing it's 22.xx, but please post your present display (U2) firmware version to be sure. Updating both will likely fix most of your problems.

Sorry for the late response.

Edit: Oops; I assumed that the latest 54.06 firmware would support the QDOP command, but in fact on checking just now, it does not. To get that to work, you will need an even later firmware; ask whoever sold you your inverter. Sorry for the false hope.

hey thanks for getting back to me ,

i already updated the firmware to 54.06 and the MCU to 22.21.
but as you said earlier the SOC % option was not available

can i use a different firware like the 72.xx or 82.xx to solve this?
also note i found somewhere a firmware version 54.63?! .. is this ok to use?

i tried contacting voltronic through there Contact us page ... but i do not get any replies.

the company that sold me the inverter is long gone ... so that is a dead end for me.

Edited December 17, 2025Dec 17 by rabihhatem
added more info

On 2025/12/10 at 12:21 PM, Kurtbe said:

Because of the difference between the TWIN an not TWIN version, I run on quite different frimware.
22.25 for the display and 81.08 for the inverter (So nothing like the 54.xx that you need.). Therefor this software is not applicable to your system.
I can however confirm that this version does allow SOC% settings. But only via the display of the converter itself. APPS like Watch Power, Energy Mate and Dessmonitor via a browser still will NOT work with SOC%.

As an example: these are my settings:

in numeric order
1	SBU= Solar, Batt, Utility (mains)
2	80: defined by Pylontech 5000. I put 50 (2400W)
3	input voltage range: UPS (tranfer =15ms, APL =20ms)
5	battery type: (PYL) 'USE' allows '13' to go below 51V
6	restart enable
7	restart enable
9	output frequency: 50
10	output voltage: 230
11	Maximum charge from grid (utility): 30Ax48V=1440W
12	sets dry-contact @30% SOC=>grid
13	sets dry-contact @50% SOC=>battery
16	Source: SNU (solar&grid) but grid only if timer 'on'.
18	alarm control: on
19	return to default screen: on
20	backlight control: on
22	beeps if source is cut off: on
23	Bypass enable=return to grid @ batt. overload
25	record faults: enable
26	bulk charging Volt: 53,2V, (by Pylontech)better=52,4
27	floating charge Volt: 53,2V (by Pylontech) Better=52,4
28	AC output mode: SIG (single phase)
29	Shut down @10% SOC '05'=PYL 47,9V when 5=USE
30-36	Not needed for Li-Ion Batteries
37	not reset data
41	Max. batt. Discharge= dds (disable)
82	12V output on/off
83	erase data log
84	data log interval:		10=6/hr=144/d=10 days
			20=3/hr=72/d=20 days
			30=2/hr=48/d=30 days
			60=1/hr=24/d=60 days
85-89	Time and date
91-98	LED's. 96:orange, 97:blu, 98: green
99	Timer for output source priority
100	Timer charge source: solar 1st (CSO):00-00,Solar+grid (SNU):00-00,only solar (OSO):00-00

also thank you for you input

7 minutes ago, rabihhatem said:

also thank you for you input

You're welcome. But I am afraid that only Coulomb will be able to provide the answer on the firmware versions. Good Luck.

On 2025/12/17 at 8:29 PM, rabihhatem said:

can i use a different firmware like the 72.xx or 82.xx to solve this?

I assume you meant 81.xx. No, both of those are for the '28066 DSP, and yours is a '2809. They would cause instant bricking.

Unfortunately, the 8 kW models don't seem to get a lot of firmware updates.

On 2025/12/17 at 8:29 PM, rabihhatem said:

also note i found somewhere a firmware version 54.63?! .. is this ok to use?

It's OK to use, but it's a few months older than 54.06, and also doesn't have the required command support. The .6x and higher are "experimental" versions to fix a specific issue, which often does not find its way back to the "production" versions (.0x, .1x etc).

On 2025/12/17 at 8:29 PM, rabihhatem said:

i tried contacting Voltronic through there Contact us page ... but i do not get any replies.

That's probably because you forgot to mention how many units per month you want to buy. Voltronic doesn't deal with customers, except if absolutely necessary and then only via resellers.

On 2025/12/17 at 8:29 PM, rabihhatem said:

the company that sold me the inverter is long gone ... so that is a dead end for me.

Sadly, that's the only official path for support.