Brain trust- I’ve installed an 11kW RCT MX2 for a long time customer and mate of mine. 
I’ve carefully gone through documentation and even went to point of contacting Dyness who indicated it is compatible with several models (VMIiI and Axpert King). 
The manual refers to the use of RS485 as the communication protocol and requires the setting in the menu to be selected as PYL (#5). Despite going through all the settings there is an error code 60 which flashes on the unit front panel. 
Secondly- with the unit in battery mode - I noted that it will only run for a short period and then shutdown by itself. Is there a specific setting which one has to make? There were no circumstances which caused it do this? Will the inverter shut off if there are no comms to the battery? 
Vaughan 

 

18 hours ago, VaughanT said:

even went to point of contacting Dyness who indicated it is compatible with several models (VMIiI and Axpert King).

Then although the Axpert MAX 11 kW is a relatively new model, I would certainly expect that it would support the latest variants of the Pylontech protocol, and presumably hence this battery and its BMS.

18 hours ago, VaughanT said:

there is an error code 60 which flashes on the unit front panel. 

I presume you've looked this up and found:

"If battery status is not allowed to charge and
discharge after the communication between
the inverter and battery is successful, it will
show code 60 to stop charging and discharging
battery."

So: you seem to be talking to the battery's BMS, but the BMS seems to be saying that thins are so bad that you can't charge OR discharge it.

It's almost like the battery voltage is incompatible with the inverter, or something similarly blatant. B4850 does suggest that it's nominally 48 V. And the Axpert MAX 11 kW does seem to be 48 V as well, at least per MPPSolar.com. Perhaps there is a problem with the battery wiring, fuse, etc?

18 hours ago, VaughanT said:

Secondly- with the unit in battery mode - I noted that it will only run for a short period and then shutdown by itself.

That could be because the power switch is off: when off, it will shut down after about half a minute IF there are no charging sources (AC-in or either PV-in).

But I suspect it will also shut down if there is a non-recoverable fault code condition. Some fault codes are recoverable, others not. I can't remember if warnings can be non-recoverable; that would seem silly. My guess is that warning code 60 would not qualify as non-recoverable. Though maybe the combination of being in battery mode, and a severe warning being in effect for the battery is enough to cause eventual shutdown. Sorry I can't be less vague.

Maybe in this condition the BMS disconnects entirely from the inverter. Can you measure the battery voltage with a multimeter at the inverter battery terminals? If it's disconnecting, that might cause the shutdown.

I have seen pylontech and dyness batteries on the forum that don't work with the supplied cable due to having a different bms and therefore different pins on the battery port.

I would suggest trying USE instead of PYL and enter settings for your battery manually and see if the inverter works and charges the battery. If this works then you know it's the bms cable that is incorrect.

I am quite perplexed by the Error code 60 which is ‘vague’  for all intensive purposes in that it doesn’t adequately describe where the fault may lie.

I’ve not physically watched the instance where the inverter shuts down in battery but can indicate that this happened after about 10-15 minutes of runtime. There was no overload condition present. 

The Voltronic product page mentions only the MaxIi. What I do note however is the differences in information on the dip switch settings between manuals - some mention that DIP1 should be on. On the master (Ie 1000). The BMS manual from Dyness states it should be 0100 and the rest of the slaves are 0000. Not sure who I must believe? In terms of cabling it’s RS485A/B - this can’t change? 
Vaughan 

14 hours ago, VaughanT said:

I’ve not physically watched the instance where the inverter shuts down in battery but can indicate that this happened after about 10-15 minutes of runtime

I found this interesting as error 61 will cause the battery to stop charging due to communication error after 10 mins which is about the same time.

There is also a lot of confusion around dip switches and rs485 pins as they seem to change and apparently a lack of chips cause some manufacturers to switch bms modules mid production leading to more confusion and supplied cables not working with certain batteries. This is why I suggested trying USE mode and entering settings manually to see if the inverter works and charges the battery for more than 15mins...that way you'll know it's a comms error and not a problem with the battery.

Hi all - my humble apologies. It is one error 60. I’ve the dreaded error 61. Have tried everything as has been suggested so far. 

On 2022/08/08 at 9:34 PM, VaughanT said:

What I do note however is the differences in information on the dip switch settings between manuals - some mention that DIP1 should be on. On the master (Ie 1000). The BMS manual from Dyness states it should be 0100 and the rest of the slaves are 0000. Not sure who I must believe?

It looks like the dip switch needs to be set according to the inverter brand which should be 0010 for voltronic:

 

Have a read through the source for this as it has loads of info on your battery and some manual settings in case you don't get the comms working (not sure if you tried USE mode yet): https://www.solar-europe.co.za/wp-content/uploads/2021/08/Dyness-Technical-Training.pdf

 

Thank you @jumper - this is the most comprehensive information I’ve seen to date on Dyness. The DIP switch settings are different to all other literature seen! What concerns me is that the Axpert is running RS485 comms - yet the protocol applied is different. 
Will share feedback 

Is there a ‘central’ place on this forum where valuable information such as this can be kept? 

Not sure if there is, but I've attached it here now (I thought it was too big) so it will be on the forum server in case that link breaks in future. Anyone searching for Dyness B4850 should find it quite easily as powerforum shows up at the top of google most of the time.

Hopefully this sorted things out for you.

Dyness-Technical-Training.pdf

On 2022/08/09 at 12:03 PM, jumper said:

There is also a lot of confusion around dip switches and rs485 pins as they seem to change and apparently a lack of chips cause some manufacturers to switch bms modules mid production leading to more confusion and supplied cables not working with certain batteries.

Just so nobody thinks I'm telling absolute fairy tales, I have attached a release from Segen Solar regarding the chip shortage and the affected Kodak and pylontech batteries. It's not a stretch to imagine this has affected other brands and manufacturers, so it is a possibility if nothing works with bms comms. Dyness and Pylontech are basically the same and Kodak is an "Axpert". I have seen a post where a forum user (SolarConvert?) has a Narada (German) battery with a different BMS even though Narada had ensured him everything should work fine. Communication in global corporations is not great, even at the best of times.

Kodak User settings.pdf

On 2022/08/14 at 4:12 PM, VaughanT said:

Is there a ‘central’ place on this forum where valuable information such as this can be kept? 

Yes, the files section:

https://powerforum.co.za/files

Thank you 

@jumper - some feedback on this installation for you. The inverter ‘dies’ when going to battery mode. Constantly displays either Error 60/61. I tried the setup you’ve proposed in the training notes and for some reason the inverter displays Error 71. When we selected the USE mode (in Menu 5) - the inverter switches seamlessly between mains and battery modes. No errors are displayed. I really cannot find anything else that is wrong with this system. All I can think is it’s a firmware conflict between the inverter and/or batteries. 

1 hour ago, VaughanT said:

@jumper - some feedback on this installation for you. The inverter ‘dies’ when going to battery mode. Constantly displays either Error 60/61. I tried the setup you’ve proposed in the training notes and for some reason the inverter displays Error 71. When we selected the USE mode (in Menu 5) - the inverter switches seamlessly between mains and battery modes. No errors are displayed. I really cannot find anything else that is wrong with this system. All I can think is it’s a firmware conflict between the inverter and/or batteries. 

My Mecer Axpert MKS IV 5600 - same thing out of the box - cable (Axpert-King) supplied with Dyness battery would sync for 30 seconds then error 61. Then after another 30 sec it would sync again and so on.  I had it back at mustek for a faulty display - the repair note said "replaced remote board" which I assume is the MCU.  Anyway since it has been back i perfectly sync with the Dyness with the cable that was marked Axpert-King.

Pretty sure the new MCU board had a different or later firmware that now works.

Edited August 16, 20223 yr by Douw Gerber

11 hours ago, VaughanT said:

When we selected the USE mode (in Menu 5) - the inverter switches seamlessly between mains and battery modes.

That's good news at least that means there isn't a problem with the battery, it must just be a communication error.

 

11 hours ago, VaughanT said:

All I can think is it’s a firmware conflict between the inverter and/or batteries

Yes, I think this might be it as it mentions firmware in the doc I posted about the chip shortage and also from what @Douw Gerberposted above. I would suggest contacting your supplier for updated firmware before doing it yourself just so you don't void any warranties.

11 hours ago, VaughanT said:

inverter displays Error 71

This is a strange one because (fault) 71 as far as I can see has to do with parallel operation, but is about firmware versions.

The only other thing I could suggest trying before reflashing firmware would be to try the dip switch to 1010, as I've read that dip 1 sets the baud rate for the comms to 9600. @Douw Gerberwhat are your dip settings on your battery and perhaps your new firmware version of the inverter if possible?

Edit: just remember to always restart the battery when changing dip settings

Edited August 17, 20223 yr by jumper

Gents - are the settings for the Dyness 4850 operating in USE mode recorded anywhere? i took some recommended settings and had these entered. The Inverter is shutting off much sooner that would be expected with a very moderate load (800W). It cannot of course determine the SOC in this mode. 
would appreciate your assistance 
 

@jumper - some feedback on this installation for you. The inverter ‘dies’ when going to battery mode. Constantly displays either Error 60/61. I tried the setup you’ve proposed in the training notes and for some reason the inverter displays Error 71. When we selected the USE mode (in Menu 5) - the inverter switches seamlessly between mains and battery modes. No errors are displayed. I really cannot find anything else that is wrong with this system. All I can think is it’s a firmware conflict between the inverter and/or batteries.