Sunsynk, HA / Predbat integration issues and help with parallel inverter setup

[gregbingham1-cyber]

Hello community,

Hope everyone is doing well.

Firstly, I am new to home assistant and can only ask for a patience with me as i have hit a brick wall after spending days/hours trying to get it working properly. All advise say with Sunsynk/deye systems, HA is the best way to go. My battery and inverter have been commissioned last week and i was hoping to get HA setup with predbat for Octopus agile tariff as soon as my SEG / export MPAN is released hence the need for an error free setup.

My system:

1. 2x Sunsynk 8kw inverters in parallel
2. Battery is a 16.1kwh fogstar (hopefully upgrade in future once the shillings are acquired)
3. MiniPC with HA connected to master inverter via a waveshare usb/RS485 plugged sharing the battery CAN port. i have followed guidance to reduce noise on the port and removed the wires irrelevant RJ45 wires from the respective battery comms and waveshare cable and both are working ok.

Current status:

I was able to get predbat going over exposed MQTT in HA via the Sunsynk / Deye Inverter add-on but i noticed the data was halved in MQTT discovered sensors and i tried to specify dual inverter in the add-on config then all sorts of issues started popping up and i felt i may need to restart my configuration but the actual issue i have is lack of experience/knowledge of predbat and there seem not to be a guide for a parallel inverter setup with predbat as far as i have searched.

Any help or steer would be greatly appreciated as my sensors seem not right and i have a strong suspicion i have omitted key configurations to get the setup working properly.

Current Config Files:

Sunsynk or Deye Inverter Add-on (multi)

DRIVER: pymodbus
INVERTERS:

• SERIAL_NR: 'xxxxxxxxx'
  HA_PREFIX: ss_slave
  MODBUS_ID: 2
  DONGLE_SERIAL_NUMBER: '0'
  PORT: /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_B0049SRV-if00-port0
• SERIAL_NR: 'yyyyyyyy'
  HA_PREFIX: ss
  MODBUS_ID: 1
  DONGLE_SERIAL_NUMBER: '0'
  PORT: /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_B0049SRV-if00-port0
  SENSOR_DEFINITIONS: single-phase
  SENSORS:
• energy_management
• power_flow_card
• battery
• settings
  SENSORS_FIRST_INVERTER:
• settings
  MANUFACTURER: Sunsynk
  READ_ALLOW_GAP: 4
  READ_SENSORS_BATCH_SIZE: 8
  SCHEDULES:
• KEY: W
  READ_EVERY: 2
  REPORT_EVERY: 5
  CHANGE_ANY: true
  CHANGE_BY: 20
  CHANGE_PERCENT: 1
  NUMBER_ENTITY_MODE: auto
  PROG_TIME_INTERVAL: '15'
  DEBUG_DEVICE: /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_B0049SRV-if00-port0

PredBat:

pred_bat:
module: predbat
class: PredBat
prefix: predbat
timezone: Europe/London

currency_symbols:
- '£'
- 'p'

battery_scaling:
- 1.0
pv_scaling:
- 1.0
load_scaling: 1.0
import_export_scaling: 1.0

num_inverters: 1
inverter_type: SK
sunsynk_has_prog: true
sunsynk_prog_time_interval: 15

battery_rate_max:
- 16000

inverter_limit:
- 12000

rates_import: 24.5p
rates_export: 15p

inverter_limit_charge:
- sensor.ss_battery_power

inverter_limit_discharge:
- sensor.ss_battery_power

soc_max:
- 16.1

load_today:
- sensor.ss_day_load_energy
pv_today:
- sensor.ss_day_pv_energy
import_today:
- sensor.ss_day_pv_energy
export_today:
- sensor.ss_day_pv_energy

soc_percent: sensor.ss_battery_soc

battery_power:
- sensor.ss_battery_power
pv_power:
- sensor.total_solar_power
grid_power:
- sensor.ss_grid_power
load_power:
- sensor.ss_load_power

charge_start_service:
- service: select.select_option
entity_id: "select.ss_prog1_charge"
option: "Allow Grid & Gen"
- service: select.select_option
entity_id: "select.ss_prog2_charge"
option: "Allow Grid & Gen"
- service: select.select_option
entity_id: "select.ss_prog3_charge"
option: "Allow Grid & Gen"
charge_stop_service:
- service: select.select_option
entity_id: "select.ss_prog1_charge"
option: "Allow Gen"
- service: select.select_option
entity_id: "select.ss_prog2_charge"
option: "Allow Gen"
- service: select.select_option
entity_id: "select.ss_prog3_charge"
option: "Allow Gen"

timed_charge_current:
- number.ss_prog1_capacity
charge_limit:
- number.ss_prog1_capacity

prog_time_start_1: select.ss_prog1_time
prog_time_charge_1: select.ss_prog1_charge
prog_time_capacity_1: number.ss_prog1_capacity
prog_time_start_2: select.ss_prog2_time
prog_time_charge_2: select.ss_prog2_charge
prog_time_capacity_2: number.ss_prog2_capacity
prog_time_start_3: select.ss_prog3_time
prog_time_charge_3: select.ss_prog3_charge
prog_time_capacity_3: number.ss_prog3_capacity

set_read_only: true
validate_configuration: true
days_previous:
- 7
forecast_hours: 48

[gcoan]

The first thing you need to get working is your inverter with Home Assistant. Be able to read the inverter data and control it by manipulating HA controls.

Predbat needs this as a prerequisite and it doesn't sound like you have achieved that yet.
Can only really suggest reaching out to the community who develop the inverter integration and engage them for help.

Once you are confident with the inverter working with home assistant you can look at predbat. There are some invalid entries in your apps.yaml, presumably AI "helped" - chdck the documentation.
But first get the inverter working

[gregbingham1-cyber]

Hi,

many thanks for giving my post a review.

yes been trying to figure it out with AI to be fair in the absence of experience or knowledge with what's going on. I have had to start from scratch and got it back to a cleaner state but the readings don't seem right even though it is much closer to the inverter readings:

Is this a sunsynk scaling issue within predbat?

I shall indeed get some help with the HA sunsynk integration but could you kindly help with the parallel inverter configuration support within predbat? this is my consolidated predbat file that generated the flow above

Current Predbat:

pred_bat:
module: predbat
class: PredBat
prefix: predbat
timezone: Europe/London

currency_symbols:
- '£'
- 'p'

battery_scaling:
- 1.0
pv_scaling:
- 1.0
load_scaling: 1.0
import_export_scaling: 1.0

num_inverters: 1
inverter_type: SK
sunsynk_has_prog: true
sunsynk_prog_time_interval: 15

battery_rate_max:
- 16000

inverter_limit:
- 12000

rates_import:

• start: "00:00:00"
  end: "23:59:59"
  rates_import: 24.5
  rates_export: 15

  --- SOLAR FORECASTING ---

open_meteo_forecast:
- kwp: 5.4
declination: 5
azimuth: 180
efficiency: 0.95

inverter_limit_charge:
- sensor.ss_battery_power

inverter_limit_discharge:
- sensor.ss_battery_power

soc_max:
- 16.1

load_today:
- sensor.ss_day_load_energy
pv_today:
- sensor.ss_day_pv_energy
import_today:
- sensor.ss_day_grid_import
export_today:
- sensor.ss_day_grid_export

soc_percent: sensor.ss_battery_soc

battery_power:
- sensor.ss_battery_power
pv_power:
- sensor.total_solar_power
grid_power:
- sensor.ss_grid_power
load_power:
- sensor.ss_load_power

charge_start_service:
- service: select.select_option
entity_id: "select.ss_prog1_charge"
option: "Allow Grid & Gen"
- service: select.select_option
entity_id: "select.ss_prog2_charge"
option: "Allow Grid & Gen"
- service: select.select_option
entity_id: "select.ss_prog3_charge"
option: "Allow Grid & Gen"
charge_stop_service:
- service: select.select_option
entity_id: "select.ss_prog1_charge"
option: "Allow Gen"
- service: select.select_option
entity_id: "select.ss_prog2_charge"
option: "Allow Gen"
- service: select.select_option
entity_id: "select.ss_prog3_charge"
option: "Allow Gen"

timed_charge_current:
- number.ss_prog1_capacity
charge_limit:
- number.ss_prog1_capacity

prog_time_start_1: select.ss_prog1_time
prog_time_charge_1: select.ss_prog1_charge
prog_time_capacity_1: number.ss_prog1_capacity
prog_time_start_2: select.ss_prog2_time
prog_time_charge_2: select.ss_prog2_charge
prog_time_capacity_2: number.ss_prog2_capacity
prog_time_start_3: select.ss_prog3_time
prog_time_charge_3: select.ss_prog3_charge
prog_time_capacity_3: number.ss_prog3_capacity

set_read_only: true
validate_configuration: true
days_previous:
- 7
forecast_hours: 48

[gregbingham1-cyber]

Hi Geoff,

Update: I have been able to control the inverter successfully using HA via MQTT switches and the sensors are pulling through data from the inverter with no issues.

Also, all of predbat switches work ok and the config show green. I know i still have the octopus api / account to setup hence why i have the fixed rate placeholder to do some testing before going live.

The plan is to be on dynamic tariff as we do not have an EV yet hence the reach out to get this working ok.

Thanks again for your help.

[gregbingham1-cyber]

For what it is worth: My main issue was with the custom CAN BMS and RS485 cable sharing the same port, on the waveshare i did use pins 1,2 & 3(ground) but i needed to discard ground on the CAN battery cable (Fogstar) as CAN did not require a ground (green) so only, pins 4 & 5 was used and i cut-off the rest of the other cables to get everything working as required on the same port. Hope it helps someone in future to avoid battery comms lock-out issues causing the inverter to discard the battery and use grid only when you are making your own custom cable.