@siedrosat, as I'm pretty sure the problem is caused by incorrect battery addresses. Would you please try the following:

1- Keep the Master battery address as 1, which is DIP 1 is ON and the rest are OFF

2- Change the Slave battery address to 3, which is DIP 1 and 2 are ON and the rest are OFF.

Then test your setup with the new addresses. You might need to restart your inverter and batteries for all changes to take effect.

You can find the exact same process I'm telling you for connecting your Pylontech BMS to your inverter in your inverter's user manual (in the Appendix).

Edited August 18, 20241 yr by Tarek Yag
Corrections and attached the instructions from the manual

@Tarek YagOk I will try this configuration in the next few days. But I'm not convinced. I only have a battery pack made up of 2 batteries, a master and a slave. With your setup it's as if there were 2 groups with a master drum each. The current configuration is attached. The L0 cable goes into the BMS port of the inverter.

I see! You have a decent point too.

Actually, the sentence "slave batteries are unrestricted" written in the Voltronic User Manual is so confusing. I'd recommend you do more research about your issue as I can't provide any more knowledge on this matter. Good luck!

One last suggestion I'd provide, give the slave battery an address of zero (all DIP switches OFF), as parallel communication between packs might not be at baud rate 9600, just like my own JK BMS. Refer to your battery's user manual to see how to connect slave batteries to a master.

On 2024/08/18 at 6:23 AM, Coulomb said:

That's from February 2024, so it's later than anything else I have, including 60.89, 60.90, and 60.95.

It's also later than 70.00.

However, 39.16 is not the latest VM IV round display firmware; that's 39.26 here.

 

I tried it (DSP only) for VM3 6kW Twin but got error 32.

I was a little scared but reverted back to 60.95 using  reflash tool  and usb port.

Edited August 21, 20241 yr by bratpit

1 hour ago, bratpit said:

I tried it (DSP only) for VM3 6kW Twin but got error 32.

I was a little scared but reverted back to 60.95 using  reflash tool  and usb port.

Did you mean that you tried DSP 60.87 firmware on your VM III Twin 6kW? This may mean that DSP 60.87 firmware might be specifically for VM IV Twin, we can't confirm it yet.

1 hour ago, Tarek Yag said:

Did you mean that you tried DSP 60.87 firmware on your VM III Twin 6kW? This may mean that DSP 60.87 firmware might be specifically for VM IV Twin, we can't confirm it yet.

Yes I tried.I'm not sure for 100% that is FW but I will not try the second time.

On 2024/08/21 at 7:04 PM, bratpit said:

I tried it (DSP only) for VM3 6kW Twin but got error 32.

I was a little scared but reverted back to 60.95 using  reflash tool  and usb port.

As you tried 3 versions ( your old one , 60.87. 60.95 ) what what the fans behavior in those 

as I didn’t manage to find quite and smart fan control except in 60.76 

@Tarek Yag I will test 60.87 and feedback you regarding its solar performance ( according to ur advice so we can see if my early morning solar production solved ) but anyway I am still forced to ho back to 60.76 ( after the test) as fans is in 60.87 very loud 

On 2024/01/06 at 10:56 PM, Coulomb said:

60.87 is the latest; in order latest to oldest: 60.87, 60.95, 60.89, 60.06, 60.76, 60.05, 60.74, 60.04, 60.66, 60.90.

[ Edit Sep 2024: Added more versions. 60.87 is now the latest; was 60.89. ]

Where does 68.04 land? 

On 2024/09/23 at 10:29 AM, nahventure said:

Where does 68.04 land? 

Between 60.95 and  60.89. It's slightly different; if the hardware identifies as the lower power model, the rating is 4.2 kW instead of the standard 4.0 kW. There may be other changes that I've not located, to justify the change of major version number (60 to 68). 

What about the version 84.03

VMIV 84.03.hex

1 minute ago, salmoallemi said:

What about the version 84.03

VMIV 84.03.hex

On 2026/01/07 at 6:43 AM, salmoallemi said:

What about the version 84.03

Presuming that you mean where does it fit in the recentness of release, the 84.03 hex file is dated 10/July/2025. So it's later than 60.10, the latest of the 60.xx series that I'm aware of (60.10 is dated 14/Jun/2024).

I mean is it compatible with my inverter

On 2026/01/08 at 11:21 AM, salmoallemi said:

I mean is it compatible with my inverter

It's not compatible with a 3 kVA inverter.

For a 4 kVA Twin, it will probably work, as VM IV and VM III firmware seems to be interchangeable these days. But I like to use the same major version number, e.g. if you inverter's existing main firmware was 84.xx, that would be fine.