CCSA10

I wish you all good luck. My Narada Red batteries have different ports  2 x RS-485 and 1 x LAN, no serial, and apparently uses a different baud rate to the white batteries, 9600 baud vs 14400 baud, I have been told. Then again, during this journey I have been told a lot of things! From my understanding the battery type sets the baud rate for the communication, so I am poked. I have managed to arrange a credit for my 3 x 7.2KWh Naradas, getting them replaced by 4 x 5.1 Shoto batteries on Wednesday, ones that work on CAN bus.
 
All the best and thanks so much for all the conversations and tips. It kept me busy for a while and I had a lot of fun in the process. For anyone that maybe interested, I have 1 of each of the suggested cable configs lying around now
 
What bothers me the most is that so called experts, supply combinations of equipment that do not work correctly. That is 1 aspect. The next is the configs of the "off the grid" systems. I have a 8KWh Deye, 24 x 455 Watt panels (the max that the 8KW Deye can take), and 22KWh of battery, and i cannot run a heater in winter. Also interesting, in summer I could generate 73KWh on a sunny day, at the moment that number has dropped to 34Kwh, so even if i added more batteries, i could not charge them in winter to cater for the longest nights.... and my house is optimised, LED globes, gas stove, inverter fridges, washing machine, heat pump tumble dryer. During the day my house idles at about 135 watts and at night when we go to bed about 350 watts (lots of LED lights around the house). Then of course using appliances and running the pool pump and stuff goes on top.
My household uses 800 KWh per month in total for everything.
This has been a most interesting exercise, and my personal perception of what it means to be "off the grid" has changed completely. I have learnt a lot!!!
All the best

Some of the experts said that with my Narada Red batteries, the baud rate for Rs485 is 9600,but with the white Naradas it is 14400, and this apparently matches type 16. Maybe there is hope for the non-red ones. Apparently the battery type on the Deye is a baud rate setting more than anything else..... Good luck. I hope it works out

Update. I had both cables discussed here made up and tried them both with my 8KW. No luck :(. I did have a mishap last weekend where my batteries went down to Zero SOC. On the Narada red batteries I have, there is a display. I then sat and recorded the % SOC and the voltage at every 10% change in SOC according to the batteries  and discovered that the voltages specified in the manuals appears to be very different to reality. Previously I set the Deye inverter Battery settings to Shutdown at 42V and Low battery at 44V as this was quite close to what I saw in the manuals I read. When my batteries went to 0% SOC, the moment that batteries started charging the panel on the batteries indicated 49.3V, so Zero SOC would be around 48.7 Volts, and not 44 as I though. I also compared and recorded the voltage on the inverter vs the voltage on the batteries. This was pretty close.
Another interesting aspect, throughout the charging cycle, the voltage difference at a specific % is 0.6V higher when charging compared to discharging. I chose to use the discharging voltage for settings, as I assumed that this would be what would trigger actions. This is the list of voltages I recorded and use now for my settings.
So batteries 0% is around 48.7 volts, and batteries full is 52.5, that is 3.2 volts difference, and then the 0.6V variance depending on charging or not changes the voltage by 19%
This is the table I now use to estimate levels when i do my settings, specifically on the time of use function. I use the Inverter reading for items that must happen while charging and the "settings on Deye) calculated values when i describe a low threshold.
 
  Batteries Charging Inverter Reading Setting on Deye 10% 49.30     20% 50.06 50.4 49.8 30% 50.33 50.6 50.0 40% 50.35 60.5 59.9 50% 50.50 50.8 50.2 60% 50.77 51.1 50.5 70% 50.86 51.2 50.6 80% 50.98 51.3 50.7 90% 51.30 51.6 51.0 100% 52.50 52.5 51.9 I also changed Battery settings on the inverter to:
Shutdown 48V
Batt low 49V
I suspect this may change, i am monitoring this closely during use. I also learnt that changing these parameters does not automatically update the Time of Use settings. Over the raining weekend I had my batteries drop to 18%, and then realised that my minimum voltage was still set to 42.5V. I have now shifted this to 49V. Will see where it goes now. I really enjoy being able to see my SOC and i suspect these values are used to calculate the SOC % from volts, so I am carefull to change them. I do not want to break someting that is working.
I am working slowly with these, as one of the benefits the panic brought is that the SOC on my Solarman app is now within 2% of what is indicated on the batteries themselves and this is amazing. Prior to this exercise, the app would say 93% and on the batteries I often found them to be 28 or 18%. Now for the 1st time I have some realistic indication. I really enjoy being able to see my SOC and i suspect these battery settings values are used by the app to calculate the SOC % from volts, so I am careful to change them. I do not want to break something that is working.
This was my main reason for wanting BMS.
I am going to give the BMS story one more shot, I am going to have a cable made up with pin 2 and 3 connected both sides but crossover, old RS232 type of cable, just for the hell of it and will let you know what happens.
If anyone has success with the BMS thing, please let me know!
This has been an interesting and very time consuming exercise, but it does feel like progress
Have an awesome day!