Skillet

Hi. I'm struggling with my setup..
Deye5kw and 2x Volta Stage1 Pro batteries.
I turned everything off, connected battery power cables, disconnected the comms cable from the inverter, then connected the link cable into the one battery IN port, the other end into the other battery OUT port, and connected the comms cable to the PCS port on the battery where the OUT port is now occupied. Turned on the battery with the PCS one first, the leds do a good green KITT impression and settle. Then I turn on the second battery, both batteries doing a Cylon impression with the green lights switching left right and eventually settling. I turn on the inverter and it starts up after about 2 mins. 
I am not able to communicate proppperly over the canbus to read the battery states. The LCD on the inverter doesn't show two batteries. These batteries don't have dip switches and are aparently smart and can set their bus address themselves.
What am I doing wrong?
There are no instructions on how to connect the second battery of this type. The Deye and Solarman apps allow control sort of. I'm worried I'm damaging the batteries.
Please can someone advise

I had 2x Volta Stage 1 batteries in parallel since May 2023 with firmware v15.44. They were reaching 100% charge together with all cells balanced within 30mV, but the packs SoC drifted apart as the batteries drain, with pack 1 on 25% while pack 2 drops to 20%. The state of health on pack 1 was 100% and pack 2 96%, so pack 2 is now accumulating higher DoD.
The supplier suggested I need a firmware update, so last night I updated them both to v15.58 successfully (each completely isolated and dip switches off), have yet to see if the SoC drift fixes itself but at least the inverter reports the average SoC instead of alternating between the 2 like it did before. Only possible issue is the cycles count for both batteries went up 10x and I'm not sure if that is just the new scaling factor is 0.1 instead of 1? Over a period of about 10 minutes pack 1 went from 260 to 2600 and pack 2 from 249 to 2498 and then they stayed there since, will give it a couple more days and see.

I have the stage 4 firmware but it is too large to post here. Please sent me a email adress so I can sent it to anybody that need it. I have version 13.8A

I hope this will help if there are still some people on this threat. I bought a 14.3kwh Volta stage 4 battery from Leading Lithuim beginning 2024. They have sent me the attach firmware upgrades and I hope this will help. They only blind spot I have is will I need to take the battery offline before upgrade the software?
stage 3 updater.zip Volta firmware updater stage 1 & 2 new.zip

More progress on this Project...a very interesting PV DC combiner box that has most ppl scratching their heads. It's a 5 in & 1 out. De rated to 125A. Will need a larger DC MCB if more PV is added. However, this plant will not grow that large. All our AC Protection is in place now it's just to terminate into the Inverter & run the Earth. Our hold up has been the FreedomWon HV 40/32 Lithium Batteries. Looks like FreedomWon can't get them out quickly enough. Some delays on the 15/12 LV units also. 

I do not have the Stage4 firmware, but will see if I can at least communicate with the BMS using the BMS software that work on the others and report back here.
Have you had any reports of the Stage4 having the SOC drift issue as well? 

I have tried updating a Stage 1 today but although I could connect to the BMS using the BMS tools beforehand, the Update tool did not want to connect.
I have tried connecting using the BMS Tools again after trying but was not able to connect since. I then noticed that the battery is displaying LED1 (Red) and LED2, 3 and 4 running green. Now not able to switch off the BMS at all as the battery power switch has no effect.
Now what!!? 

My night time load is about 8.5kwh and off-grid discharge cut off SOC - 15, on- grid EOD Voltage (v) 42, in grid EOD soc(%) 15