Free Cold Beer

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1

Who doesn’t like Free Cold Beer? (total click bait)

Running a second fridge can take around 350kwh per year. This can be around $80 per year (depending on the cost of energy in your area).

Here is a simple ESPHome configuration for a Sonoff that will only turn the device on when your house is exporting energy to the grid (750w in this example).

Note that you will need a sensor inside HomeAssistant that knows the value of what you are Exporting/Importing.

## Beer Fridge
## filename: espbeerfridge.yaml
# Sonoff POW R2
# Button toggles power on/off
# Cron'd to check Solar every 15 minutes, on if there is Solar Exporting.

substitutions:
  upper_devicename: Beer Fridge
  devicename: espbeerfridge
  
  
esphome:
  name: espbeerfridge
  platform: ESP8266
  board: esp8285
  arduino_version: 2.4.2

sun:
  latitude: !secret gps_latitude
  longitude: !secret gps_longitude

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_pass
  
# Enable logging
logger:
  baud_rate: 0

uart:
  rx_pin: RX
  baud_rate: 4800

# Enable Home Assistant API
api:
  password: !secret api_pass

ota:
  password: !secret ota_pass


status_led:
  pin: GPIO13

sensor:
  - platform: uptime
    name: $upper_devicename Uptime
    
  - platform: wifi_signal
    name: $upper_devicename WiFi Signal
    update_interval: 15s 
    
  - platform: cse7766
    current:
      name: $upper_devicename Current
    voltage:
      name: $upper_devicename Voltage
    power:
      name: $upper_devicename Power

  - platform: homeassistant
    name: "House Grid Power"
    entity_id: sensor.iotawatt_output_live_gridusage ###this is the sensor in Home Assistant that holds the value of your Solar Export
    id: gridpower  
      
switch:
  ## restart
  - platform: restart
    name: $upper_devicename Restart

  ## relay / pump / compressor
  - platform: gpio
    pin: GPIO12
    name: $upper_devicename Compressor
    id: compressor
    icon: mdi:glass-mug

binary_sensor:
  - platform: status
    name: $upper_devicename Status

  ## button - toggle relay
  - platform: gpio
    name: $upper_devicename Button
    pin:
      number: GPIO0
      inverted: true
    # Toggle pump when user presses the Sonoff Button
    on_press:
      - switch.toggle: compressor


## Use time
time:
  - platform: homeassistant
    on_time:
      - seconds: 0
        minutes: /15  ###Note that Compressors should run for at leas 15min
        then:
          - if:
              condition:
                lambda: 'return id(gridpower).state > -750;'
              then:
                - logger.log: "Low or No solar export.  Less than 750w. Turn Off"
                - switch.turn_off: compressor
                - delay: 5s
              else:
                - logger.log: "Good solar export.  More than 750w. Turn On"       
                - switch.turn_on: compressor
2

image image

3

Came here for the free beer and blueprints and got neither. :slight_smile:

You may want to remove the “Blueprints” tag from your post because it doesn’t appear to contain anything related to blueprints.

I believe this is a useful contribution to the Share Your Projects category.

4

Make it beerprints…

5

apologies, I haven’t been following HA as much… didn’t realise that ‘Blueprints’ were a new thing.

edited the original tags.

6

Probably worth mentioning that you should NOT use your fridge to store perishable items if you use this config!

Update demonstrating the fridge turning on this morning once power became available
image