Hi. First time I switched on MAX II 11kW and can't really believe how loud (fans noise) is that model. Is it normal? Also what means H5 indicated on a screen?

VIDEO

 

Edited November 10, 20241 yr by Bocian

OK I found what HS/H5 issue is all about. Whether output 230V is turned on or off from the button, I cannot change it from PAL to SIG with #28 (tried with only 48V DC connected, only AC in, both connected still I cannot change).

Edited November 8, 20241 yr by Bocian

On 2024/11/08 at 11:41 PM, Bocian said:

I cannot change it from PAL to SIG with #28 (tried with only 48V DC connected, only AC in, both connected still I cannot change).

All I can suggest is that this is a poor clone that somehow isn't sending the right commands from the display processor to the main processor.

However, what little I could see from the video suggested it is a genuine Voltronic. Can you post a photo of the sticker on the side?

Also, what is the main (U1, DSP) firmware version? There is a small chance that this is fixed in later firmwares.

Hi Coulomb. Thanks for reply. Here are photos already taken. I will add photos of control board and main processor soon.

6 hours ago, Coulomb said:

All I can suggest is that this is a poor clone that somehow isn't sending the right commands from the display processor to the main processor.

However, what little I could see from the video suggested it is a genuine Voltronic. Can you post a photo of the sticker on the side?

Also, what is the main (U1, DSP) firmware version? There is a small chance that this is fixed in later firmwares.

 

 

 

 

 

 

 

 

 

 

Edited November 10, 20241 yr by Bocian

Also I will try to change original very loud fans with better quality Sunon Maglev 92x92x25mm fans.

https://www.digikey.com/en/products/detail/sunon-fans/PF92251V1-1000U-G99/7927803

BTW. You may think that 0,37A fan as a replacement to 1A will have not enough power to cool the components inside but You need to know that current declared on a sticker is twice to the real one. This one was measured 0,51A at 12V DC voltage.

Edited November 10, 20241 yr by Bocian

6 hours ago, Coulomb said:

All I can suggest is that this is a poor clone that somehow isn't sending the right commands from the display processor to the main processor.

However, what little I could see from the video suggested it is a genuine Voltronic. Can you post a photo of the sticker on the side?

Also, what is the main (U1, DSP) firmware version? There is a small chance that this is fixed in later firmwares.

Photos attached.

14 hours ago, Bocian said:

Photos attached.

Thanks.

Interesting that  it uses a '28069, I'm not familiar with that variant. It seems to be a two core version of the '28066. It's not clear if they just could not obtain the single core chip, or if they are using both cores.

Unfortunately, I've not seen any 75.xx Axpert Max II 11kW '2806x Twin firmwares at all.

The label strongly suggests that it's a clone, so it's compatibility with Voltronic firmware is unknown.

So the quieter fans sounds like the only option until a suitable firmware turns up.

3 hours ago, Coulomb said:

Thanks.

Interesting that  it uses a '28069, I'm not familiar with that variant. It seems to be a two core version of the '28066. It's not clear if they just could not obtain the single core chip, or if they are using both cores.

Unfortunately, I've not seen any 75.xx Axpert Max II 11kW '2806x Twin firmwares at all.

The label strongly suggests that it's a clone, so it's compatibility with Voltronic firmware is unknown.

So the quieter fans sounds like the only option until a suitable firmware turns up.

Thanks

On 2024/11/11 at 3:17 PM, Coulomb said:

Unfortunately, I've not seen any 75.xx Axpert Max II 11kW '2806x Twin firmwares at all.

I have recently come across firmware version 75.85.

This is main (U1) factory firmware version 75.85 for the Axpert Max II 11kW '28066 Twin. Do not use with any other model or version.

Use at your own risk. The hex file is dated 02/Jun/2025.

Firmware upload instructions for models with a removable or colour display.

This firmware processes the QDOP command, so with suitably recent display firmware, it should support SoC% for settings 12,13, and 29 when connected to a suitable battery's BMS.

MAXII11K_TWIN_DSP75.85.7z

[ Edit: Added "or colour" before "display" ]

Edited 12 hours ago12 hr by Coulomb

On 7/15/2025 at 7:30 AM, Coulomb said:

I have recently come across firmware version 75.85.

This is main (U1) factory firmware version 75.85 for the Axpert Max II 11kW '28066 Twin. Do not use with any other model or version.

Use at your own risk. The hex file is dated 02/Jun/2025.

Firmware upload instructions for models with a removable display.

This firmware processes the QDOP command, so with suitably recent display firmware, it should support SoC% for settings 12,13, and 29 when connected to a suitable battery's BMS.

MAXII11K_TWIN_DSP75.85.7z

What specific firmware version is this, and will it work with the Max 2 11kW inverter model?