Using solar over-production to heat boiler

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For the next one who searches for a similar solution I’ll post my final solution.

I got a Itho Daalderop Close-up boiler, 15 liters. This is sufficient for a 7 minute shower session. It’s connected to my Intergas boiler in a way that if the electric boiler is empty the gas boiler will take over. As a fall-back.

These are the two automations I’ve used. I’m using my smart meter and the production data.

IMG_9427
IMG_94271920×1440 127 KB

It’s a 2kW boiler and my solar setup has a maximum production of 3.5kW. Currently I can use the grid a battery, meaning my energy company creates a bill based on net usage.

- id: '1665000372764'
  alias: Boiler solar on < -1250
  description: ''
  trigger:
  - platform: numeric_state
    entity_id: sensor.power_consumption_net
    for:
      hours: 0
      minutes: 2
      seconds: 0
    below: -1250
  condition:
  - condition: numeric_state
    entity_id: sensor.envoy_122138022567_current_power_production
    above: 1
  - condition: state
    entity_id: sensor.power_tariff
    state: normal
  - condition: numeric_state
    entity_id: sensor.energy_day_net
    below: 0
  action:
  - service: switch.turn_on
    data: {}
    target:
      entity_id: switch.ac_13bc0cfe_9
  mode: single
- id: '1665000420150'
  alias: Boiler solar off > 1200
  description: ''
  trigger:
  - platform: numeric_state
    entity_id: sensor.envoy_122138022567_current_power_production
    below: 200
    enabled: true
    for:
      hours: 0
      minutes: 3
      seconds: 0
  - platform: numeric_state
    entity_id: sensor.power_consumption_net
    for:
      hours: 0
      minutes: 6
      seconds: 0
    above: 1200
  condition: []
  action:
  - service: switch.turn_off
    data: {}
    target:
      entity_id: switch.ac_13bc0cfe_9
  mode: single
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