h1771t

Is difficult to know whether what you are seeing on your inverter is correct or not without knowing what you are seeing.
Perhaps post the display screen from the BMS info part of the menu
It shouldn't look like this:


It should look like this:

@h1771t and others,
I notice that on most, if not all, the Deye/SS inverters all now utilise a combo port, i.e. RS485 & CAN shares 1 port.
So that port should be occupied by the CAN bus cable for the Battery comms.
So you need to combine the two cables with a splitter. All good.
I recently worked on a 12kW Deye 3ph, and the only splitter I had required a short Eth cable between the splitter and the Inverter.
But the resulting RS485 data got scrambled every now and again, so the data was of no use. I suspect that the cable I used for the link was UTP, and should have been STP, as that is what the solar-assistant splitter cable used. As I was working away from home, I had to make another plan.
The only way was to cut the two end of the CAN & RS485 cable, and crimp a new RJ45 connector onto the 2 cable combo.

I connected according to  https://kellerza.github.io/sunsynk/guide/wiring and I'm getting data now, thx everyone

Hi Cristian,
Here are photos of my setup. As you can see I did change my Modbus SN to 01 (It did not break anything on my side  ). You can also see I plugged the network cable in the top left port. I use a RS485 to USB adaptor and I use a Raspberry Pi 4. I'm not familiar with the ESP so I cannot assist with that.
This is my full SunSynk YAML config if that will help you:

DRIVER: pymodbus INVERTERS: - SERIAL_NR: "2209236579" HA_PREFIX: SS MODBUS_ID: 1 DONGLE_SERIAL_NUMBER: "2727046969" PORT: "" SENSOR_DEFINITIONS: single-phase SENSORS: - energy_management - power_flow_card - pv2_power - pv2_current - pv2_voltage SENSORS_FIRST_INVERTER: - settings MANUFACTURER: Sunsynk READ_ALLOW_GAP: 2 READ_SENSORS_BATCH_SIZE: 20 SCHEDULES: - KEY: W READ_EVERY: 5 REPORT_EVERY: 60 CHANGE_ANY: false CHANGE_BY: 80 CHANGE_PERCENT: 0 NUMBER_ENTITY_MODE: auto MQTT_HOST: core-mosquitto MQTT_PORT: 1883 MQTT_USERNAME: mqtt_user MQTT_PASSWORD: Tulbach10 DEBUG: 0 DEBUG_DEVICE: /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0  

You're right. I'm getting confused seeing the circuit diagrams of basic series circuits with batteries, which are constant voltage, and assuming the zone circuit is constant voltage, which it isn't.
I measured the voltage on some closed zones at 2V, and an open zone at 5V. I guess these zone circuits are then constant current circuits?
Also the interface developer confirmed what you said in a nice and short summary here: https://community.konnected.io/t/how-does-the-konnected-alarm-panel-interface-module-work-electrically/39881/2
Thanks again for the info

Normally Closed (NC) sensors are closed in standby. Alarm panels usually use End-of-Line Resistors to monitor zone resistance normall ~ 2k ohm. When alarm sensor is open = infinite resistance.Tamper, short or wire-cut the resistance is outside of the expected range.
The panel constantly measures voltage across the zone via pull-up/down resistors or internal ADCs(analog to digital converters) to decide the zone state.
Here's how these interfaces typically avoid interfering with the panel. High Impedance Voltage Sensing. The interface doesn't draw any meaningful current it behaves like a voltmeter across the zone input. Since the voltage across the zone changes depending on whether the circuit is intact, open, or shorted, the interface can just observe the voltage level and because it has very high impedance >100kohm input resistance it doesn’t affect the total resistance the panel sees which is usually around 2k ohm.
So yes, the interface reads voltage, not current. This avoids all the resistance-parallel concerns.

Just go for 50mm2. You really do not want to have the insulation melt and catch fire.
For 2 x 25mm to equally share the load, they need to be exact in all aspects. Don't chance it for a couple hundred R.

you need 2 batteries for 12kw inverter
Recommended Charge/Discharge Current (A) 140 for your battery
200amp its max. for short time

2x35mm2 to be safe

Other threads recommend 35mm² cable for 100A. The shorter the cable is, the smaller you can get away with.