ho to use cheapest energy hours

[eqasxar]

I adapted this macro from https://github.com/TheFes/cheapest-energy-hours for my own use — currently it only controls a test relay.

My goal is to use this macro with the Solis Modbus integration, so that when summer ends, I can start charging the battery from the grid during the cheapest hours.

How can I achieve this?
Which Modbus register or switch should I use to enable grid charging on my Solis inverter?

[Pho3niX90]

Which solis do you have?

[eqasxar]

I have a Solis S6-EH3P15K-H.

[julmnk]

I am using S6-EH3P15K02-NV-L so it must be very similar. I am located in Europe Lithuania. Solis support enabled Nord pool option and I can set price when I want to charge my batteries but a second option is that you can use Home Assistant Solis Modbus integration with e.g. Waveshare RS485 to Eth (B) adapter and Home Assistant Automation. I installed in addition Nord pool integration to take Electricity prices for our region.
At HA you shall go to Settings -> Automations & scenes press + Create Automation and either you ask chatGPT for help or you can adapt my YAML config to your needs which is checking prices each 15 min and changing Self use or Feed in Priority mode in depending on price. Similar you can sent different ToU charging or also discharing slots with paramters at Solis and just switch them on of off with HA Automations & scenes.... or even set ToU charge/discharge time, current, SoC or voltage....
here is my example:

alias: Nord pool Zero export control Solis S6
description: ""
triggers:

• minutes: /15
  trigger: time_pattern
  actions:
• choose:
  • conditions:
    • condition: numeric_state
      entity_id: sensor.nordpool_kwh_lt_eur_3_50_021
      below: 17.76
      sequence:
    • action: switch.turn_on
      target:
      entity_id: switch.self_use_mode
      data: {}
    • target:
      entity_id: number.solis_s6_eh3p_s6_eh3p15k02_nv_l_backflow_power
      data:
      value: 0
      action: number.set_value
  • conditions:
    • condition: numeric_state
      entity_id: sensor.nordpool_kwh_lt_eur_3_50_021
      above: 17.77
      sequence:
    • action: switch.turn_on
      target:
      entity_id: switch.feed_in_priority_mode
      data: {}
    • target:
      entity_id: number.solis_s6_eh3p_s6_eh3p15k02_nv_l_backflow_power
      data:
      value: 9800
      action: number.set_value

[julmnk]

maybe you will be interested so sharing other two my automations :
First one, Solis ToU (also known as Charge&Discharge Slot configuration) has pre-configured "Discharge Time Slot 1" with dedicated start/end time, Discharge Current, and Volatege (SoC if CanBus to battery is used), like alias says first YAML is to switch discharge off if batt. voaltge below 52.4V, second is for switch On if above 53.5V at specific period of the day from 5:00 in the morning to 10:00

alias: Switch discharge_period_1 Off if battery_voltage <52.4V
description: ""
triggers:

• minutes: /15
  trigger: time_pattern
  conditions:
• condition: numeric_state
  entity_id: sensor.solis_s6_eh3p_s6_eh3p15k02_nv_l_battery_voltage
  below: 52.4
• condition: time
  after: "05:00:00"
  before: "10:00:00"
  actions:
• action: switch.turn_off
  target:
  entity_id: switch.grid_time_of_use_discharge_period_1
  data: {}
  mode: single

alias: Switch discharge_period_1 On if battery_voltage >53.5V
description: ""
triggers:

• minutes: /15
  trigger: time_pattern
  conditions:
• condition: numeric_state
  entity_id: sensor.solis_s6_eh3p_s6_eh3p15k02_nv_l_battery_voltage
  above: 53.5
• condition: time
  after: "05:00:00"
  before: "10:00:00"
  actions:
• action: switch.turn_on
  target:
  entity_id: switch.grid_time_of_use_discharge_period_1
  data: {}
  mode: single