Perfo

@Sc00bs I've studied your videos Sc00bs and they are very good. It was my back up plan to use an esp32 and follow your instructions if I couldn't get my ModBus adapter to work.  I'm not really totally sure why I wanted to use the WaveShare adapter and not go straight for the Esp32 anyway. I liked the look of the solution plus I can connect multiple inverters to the same module just using dumb RJ45 T's they are a couple of £ (like one below). I like the idea that there is no remote intelligence. The WaveShare has a bit of inbuilt firmware but those and T's don't have any bespoke firmware they are off the shelf plug and play (nearly as you have to set some parameters on the WaveShare) . I know this moves the processing load on to the Home Assistant server but I rather it this end if possible.  But never say never, I may be back to rethink in the future. 

I have not manage to do it 
I will have a look at it tomorrow 

Lets first see if two will work...

I'll have to try and dig out the connection details for mine as they look different to yours and the CT's go in to terminals 3 and 4 on the strip not 5 and 6 like yours but as I say the lay out of mine is different. 
 
 
It is well documented that different size inverters connect on different terminals for the CT. It also caters for single and split phase. 
 

Yes, Centurion South Africa 
I was using the 8KW manual...
Yes the Chint meter is using RS485 comms but if you read the Deye manual u will see Eastron is also compatible
 
You need the Deye manual to get the meter_RS485 connection  
 
I will test for you this weekend If it is possible to read the meter from 2 different devices simultaneous  
 
this is the Eastron meter I am using and where I got it 
https://www.aliexpress.com/i/32845403260.html
 
Yes the main supply to the house will feed through the power meter
 

I'm not sure if I understand your situation entirely, but here's some of my comments:
There should be nothing stopping you from having a bank of batteries connected to the 8kw inverter and another bank of batteries connected to the 5kw inverter. I don't think you should have the same bank of batteries connected to two inverters though. Yes, you might have a situation where there's extra solar capacity on eg. the 8kw inverter when its bank of batteries is fully charged and the 5kw bank is not charged yet, but it could always provide that extra power on the AC side to run the house.
The DC cables between batteries should be as close as possible to the same length/resistance if you're using a battery bus-bar. If you're not using a bus-bar, you should connect the positive cable to the one end of the bank of batteries and the negative to the other end of the bank, but you will need thicker cables for that since cables in a daisy chain setup will carry more current.
The only limit to communication cables are whatever that protocol's limit is, eg. CAN and RS485 limits, depending on how you handle inter-battery and battery-inverter communication. I'm using CAN between inverter and battery and RS485 between the batteries, but mine are all close by and not in different buildings like yours. However, I have no idea whether communication between different model inverters can work and whether they can run in parallel. Sunsynk should be able to answer that. My two are the same unit and hence they run in parallel but even then I see some odd behaviour at times.

Thanks Tim and Scorp.
single phase. All feeding one house.  Very simple really.    One house with a cable T’d off the incoming grid supply between the incoming fuse and the house consumer unit. This cable then goes off to one building where two of the inverters (3.6kW and 5.5kW) are then off to another building (shed) with the 8kW in.  There are various isolators and fuses etc etc but electrically all the inverters are on the same conductor connected directly to the incoming supply. All three CTs are on the incoming supply grid side of this connection point.  I’m a newb to this but worked many years in power stations and the power industry.  My closing comment about CT placements was in line with what Scorp mentioned but I had to ponder it.  The only difference between me having two system or me having one and my neighbour having one (on the same phase) is the CT placement. To the grid there is no difference. If I only charged between certain times from the grid and these times where the same for both batteries then neither could discharge (fight) during this time. Then if I set the inverters to only charge on their own solar output outside of these times they shouldn’t fight at all.   The only downside would be once one battery was full the excess solar from that system couldn’t be used to charge the other nor could the solar output from the other 3.6kW inverter but the house loads absorbs this anyway..

https://github.com/slipx06/Sunsynk-Home-Assistant-Dash/blob/main/ESPHome-1P-Sunsynk-Deye.yaml
This is the single phase inverter yaml
I was using it with this  
 
 
Here is examples of integration 
 https://www.home-assistant.io/integrations/modbus/

I have played with this converter that is working and cheap from micro robotics 
https://www.robotics.org.za/communication-wireless-Industrial/serial-to-ethernet-converters/USR-DR302
You can use Slipx's yaml file for the ESP32 to read the registers used...
 

I'm new on this Forum but thought I pop in to this thread to say thanks to you Martin for this excellent project. I'm using it for three SunSynk inverts and it works great.  
The only problems I have are mainly internet related. Thanks for sharing this ....

It seems there are issues with that module
https://kellerza.github.io/sunsynk/guide/wiring
 

Hey! I'm new to Home Assistant. I have messed with it before in a VM but never took it serious because I didn't really bother to check it out properly. Now I'm shocked with what can be done with it!
I wanted to connect my HA installation HP600 Mini PC (8GB Ram , 512 SSD and some i3 CPU) After searching a little I and being a bit new to this I couldn't've really find a  quick and easy way to connect to my Sunsynk inverter in the cloud. I dont really care having updates by the second the refresh rate offered by sunsynk.net is good enough for me.
I'm not sure if the following will be helpful to anyone. But it works well for me. 
I created a simple HA add-on that will allow you to connect your Sunsynk.net account with your HA instance quick and easy without having to install any additional components.
Just add the repository to your HA Add-on store and install. 

All it its is a simple bash script making use of curl to fetch values from sunsynk.net and then those values are posted to some entities in HA. It doesn't come with any thing other than that. You can then add those entities to cards on your dashboard or even map them to the all so awesome card created by SlipX06

And it only supports 1 single inverter, and sunsynk.net region2
Full installation instructions here --> https://github.com/martinville/solarsynk/blob/main/DOCS.md
But if you are like me and you first want to try it and then read the manual 🙂  Here's the link to the repository https://github.com/martinville/solarsynk just add it to your HA store and install.
 

 
See working example in action.

For the sake of ease i named the entities exactly as shown in SlipX06's documentation to configure the card. Just substitute "Sunsynk" with "SolarSynk" or just copy the below setup config.
Lastly if you feel i missed some important data points let me know and I will add them.
type: custom:sunsynk-power-flow-card cardstyle: lite show_solar: true battery: energy: 0 shutdown_soc: 20 show_daily: true solar: show_daily: true mppts: 2 load: show_daily: true grid: show_daily_buy: true show_daily_sell: false show_nonessential: true entities: use_timer_248: switch.sunsynk_toggle_system_timer priority_load_243: switch.sunsynk_toggle_priority_load inverter_voltage_154: sensor.solarsynk_inverter_voltage load_frequency_192: sensor.solarsynk_load_frequency inverter_current_164: sensor.solarsynk_inverter_current inverter_power_175: sensor.solarsynk_inverter_power grid_connected_status_194: binary_sensor.solarsynk_grid_connected_status inverter_status_59: sensor.solarsynk_overall_state day_battery_charge_70: sensor.solarsynk_day_battery_charge day_battery_discharge_71: sensor.solarsynk_day_battery_discharge battery_voltage_183: sensor.solarsynk_battery_voltage battery_soc_184: sensor.solarsynk_battery_soc battery_power_190: sensor.solarsynk_battery_power battery_current_191: sensor.solarsynk_battery_current grid_power_169: sensor.solarsynk_grid_power day_grid_import_76: sensor.solarsynk_day_grid_import day_grid_export_77: sensor.solarsynk_day_grid_export grid_ct_power_172: sensor.solarsynk_grid_power day_load_energy_84: sensor.solarsynk_day_load_energy essential_power: none nonessential_power: none aux_power_166: sensor.sunsynk_aux_power day_pv_energy_108: sensor.solarsynk_day_pv_energy pv1_power_186: sensor.solarsynk_pv1_power pv2_power_187: sensor.solarsynk_pv2_power pv1_voltage_109: sensor.solarsynk_pv1_voltage pv1_current_110: sensor.solarsynk_pv1_current pv2_voltage_111: sensor.solarsynk_pv2_voltage pv2_current_112: sensor.solarsynk_pv2_current Below is a full list of entities which will be populated. Note that these entities are created via the HA API and will be "Read-Only" you also cannot delete them. But dont be alarmed.
If you ever wish to remove them, you can just uninstall this addon and then gibe HA a reboot and they should go away on their own.
battery_capacity battery_chargevolt battery_current battery_dischargevolt battery_power battery_soc battery_temperature battery_type battery_voltage day_battery_charge day_battery_discharge day_grid_export day_grid_import day_load_energy day_pv_energy grid_connected_status grid_frequency grid_power inverter_current inverter_frequency inverter_power inverter_voltage load_current load_frequency load_power load_totalpower load_voltage pv1_current pv1_power pv1_voltage pv2_current pv2_power pv2_voltage overall_state  
 
 
 
 
 
 
 

At my house. it is a small holding with a few out buildings and luckily three are south facing so I've utilised all available space.   I didn't realise at the time I'd have difficulty getting the inverters to talk to each other. I was intending to share the batteries out but have been told by sunsynk I can't. I have to put all the batterys on one inverter which is a bit pants. So just including this snippet incase you are thinking of going for something similar and thus the question you asked... 

Hello all, 
I've been trawling around this site for a few days now and thanks to all those that take the time to post some pretty interesting content.   A bit about me. Worked in power industry , electronic design (low level stuff) and write a bit of software every now and then. So definitely an eternal fiddler with nothing but a shortage of time thwarting my efforts to learn everything.. 
My new set up :-
1 x 3.6 kwp Sunsynk solar PV array and inverter 
1 x 5.5 kwp solar PV array and inverter 
1 x 8.8 Kwp solar PV array , inverter and 40 kwh Sunsynk battery.
1 x Old sunny boy 4 kwp  solar PV array and inverter. 
I have a couple of EV cars (and a couple of chargers Zappi, Ohme) and an Airsoruce heat pump.
New (to me as just set it up) Home Assistant  running on an RPI4 with SSD.
So many learning curves here but hoping to end up running the integrations and control through HA for the whole house.
I have so many questions that I'll probably bore/annoy you 🙂 but I hope to reach a point where my project maybe able to help others if I get it working. 
See you on the forum dudes....