電量監測可以幫你做什麼：從電鍋防空燒到電費預估

alias: 洗衣機洗好通知
mode: single
triggers:
  - trigger: numeric_state          # 開始洗：功率高於 10 W 持續 1 分鐘
    id: start
    entity_id: sensor.washer_power
    above: 10
    for: "00:01:00"
  - trigger: numeric_state          # 洗好：功率低於 3.5 W 持續 3 分鐘
    id: done
    entity_id: sensor.washer_power
    below: 3.5
    for: "00:03:00"
actions:
  - choose:
      - conditions:
          - condition: trigger
            id: start
        sequence:
          - action: input_boolean.turn_on
            target:
              entity_id: input_boolean.washer_running
      - conditions:
          - condition: trigger
            id: done
          - condition: state          # 剛剛真的在洗，才算洗好
            entity_id: input_boolean.washer_running
            state: "on"
        sequence:
          - action: input_boolean.turn_off
            target:
              entity_id: input_boolean.washer_running
          - action: notify.notify
            data:
              message: "洗衣機洗好了"

# 一、累積用電：整套系統裡唯一會歸零的地方
utility_meter:
  power_cycle_energy:
    source: sensor.your_total_energy_kwh     # 電表總累積度數（kWh，total_increasing）
    name: Power cycle energy
    cron: "0 0 13 1,3,5,7,9,11 *"            # 例：奇數月 13 日 00:00 歸零，改成你的抄表日

template:
  - sensor:
      # 二、分母：週期已過天數，做成看得到的 sensor
      - name: Power cycle days
        unique_id: power_cycle_days
        unit_of_measurement: d
        state: >-
          {% set reset = state_attr('sensor.power_cycle_energy', 'last_reset') %}
          {% if reset is none %}unknown{% else %}
          {{ ((now() - (reset | as_datetime)).total_seconds() / 86400) | round(2) }}
          {% endif %}

      # 三、外推：分母不到 3 天就不給數字，附可信度
      - name: Power cycle estimate
        unique_id: power_cycle_estimate
        unit_of_measurement: kWh
        availability: "{{ states('sensor.power_cycle_days') | float(0) >= 3 }}"
        state: >-
          {% set kwh = states('sensor.power_cycle_energy') | float(0) %}
          {% set days = states('sensor.power_cycle_days') | float(1) %}
          {{ (kwh / days * 60) | round(0) }}
        attributes:
          confidence: >-
            {% set d = states('sensor.power_cycle_days') | float(0) %}
            {{ 'low' if d < 7 else 'medium' if d < 21 else 'high' }}

      # 四、級距電價：表燈非時間電價，兩個月級距＝月級距 ×2，2025-10-01 版
      - name: Power tier price
        unique_id: power_tier_price
        unit_of_measurement: "TWD/kWh"
        availability: "{{ has_value('sensor.power_cycle_estimate') }}"
        state: >-
          {% set kwh = states('sensor.power_cycle_estimate') | float(0) %}
          {% set reset = state_attr('sensor.power_cycle_energy', 'last_reset') | as_datetime %}
          {% set ns = namespace(summer=0, price=none) %}
          {% for i in range(60) %}
            {% if (reset + timedelta(days=i)).month in [6, 7, 8, 9] %}
              {% set ns.summer = ns.summer + 1 %}
            {% endif %}
          {% endfor %}
          {% set r = ns.summer / 60 %}
          {% set tiers = [(240, 1.78, 1.78), (660, 2.55, 2.26), (1000, 3.80, 3.13),
                          (1400, 5.14, 4.24), (2000, 6.44, 5.27), (999999, 8.86, 7.03)] %}
          {% for t in tiers if ns.price is none %}
            {% if kwh <= t[0] %}{% set ns.price = t[1] * r + t[2] * (1 - r) %}{% endif %}
          {% endfor %}
          {{ ns.price | round(2) }}

      # 五、預估電費：逐級累進加總
      - name: Power cycle bill
        unique_id: power_cycle_bill
        unit_of_measurement: TWD
        availability: "{{ has_value('sensor.power_cycle_estimate') }}"
        state: >-
          {% set kwh = states('sensor.power_cycle_estimate') | float(0) %}
          {% set reset = state_attr('sensor.power_cycle_energy', 'last_reset') | as_datetime %}
          {% set ns = namespace(summer=0, total=0.0, left=kwh, prev=0) %}
          {% for i in range(60) %}
            {% if (reset + timedelta(days=i)).month in [6, 7, 8, 9] %}
              {% set ns.summer = ns.summer + 1 %}
            {% endif %}
          {% endfor %}
          {% set r = ns.summer / 60 %}
          {% set tiers = [(240, 1.78, 1.78), (660, 2.55, 2.26), (1000, 3.80, 3.13),
                          (1400, 5.14, 4.24), (2000, 6.44, 5.27), (999999, 8.86, 7.03)] %}
          {% for t in tiers if ns.left > 0 %}
            {% set use = [ns.left, t[0] - ns.prev] | min %}
            {% set ns.total = ns.total + use * (t[1] * r + t[2] * (1 - r)) %}
            {% set ns.left = ns.left - use %}
            {% set ns.prev = t[0] %}
          {% endfor %}
          {{ ns.total | round(0) }}