From 5c48e1c2a52d8492f699100115a3e4af0aa39efa Mon Sep 17 00:00:00 2001
From: martin <martin.lindenau@gmail.com>
Date: Mon, 1 Jun 2026 04:46:00 +0000
Subject: [PATCH] Fix: store start_time as Unix timestamp to avoid
 datetime/string subtraction error

---
 .../automation/shelly_charger_monitor.yaml    | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/blueprints/automation/shelly_charger_monitor.yaml b/blueprints/automation/shelly_charger_monitor.yaml
index 9bb6bbb..54ea98f 100644
--- a/blueprints/automation/shelly_charger_monitor.yaml
+++ b/blueprints/automation/shelly_charger_monitor.yaml
@@ -156,9 +156,8 @@ trigger:
 
 action:
   - variables:
-      start_time: "{{ now() }}"
+      start_ts: "{{ now().timestamp() | int }}"
       start_power: "{{ states(power_sensor) | float(0) | round(1) }}"
-      start_energy_raw: "{{ states(energy_sensor) | float(0) }}"
       start_energy_kwh: >
         {{ (states(energy_sensor) | float(0)) / 1000
            if energy_unit == 'Wh'
@@ -175,7 +174,7 @@ action:
           title: "🔋 Laden gestartet – {{ device_name }}"
           message: >
             Ladevorgang erkannt: {{ start_power }} W.
-            Gestartet um {{ start_time | as_timestamp | timestamp_custom('%H:%M Uhr') }}.
+            Gestartet um {{ start_ts | timestamp_custom('%H:%M Uhr') }}.
 
   - wait_for_trigger:
       - platform: numeric_state
@@ -189,11 +188,7 @@ action:
       seconds: "{{ stop_debounce_seconds }}"
 
   - variables:
-      end_time: "{{ now() }}"
-      end_energy_kwh: >
-        {{ (states(energy_sensor) | float(0)) / 1000
-           if energy_unit == 'Wh'
-           else (states(energy_sensor) | float(0)) }}
+      end_ts: "{{ now().timestamp() | int }}"
       charged_kwh: >
         {{ [((states(energy_sensor) | float(0)) / 1000
              if energy_unit == 'Wh'
@@ -204,12 +199,10 @@ action:
                if energy_unit == 'Wh'
                else (states(energy_sensor) | float(0)))
               - start_energy_kwh, 0] | max * electricity_price) | round(2) }}
-      duration_seconds: >
-        {{ (now() - start_time).total_seconds() | int }}
       duration_text: >
-        {% set s = (now() - start_time).total_seconds() | int %}
-        {% set h = (s // 3600) %}
-        {% set m = ((s % 3600) // 60) %}
+        {% set s = (now().timestamp() | int) - start_ts %}
+        {% set h = (s // 3600) | int %}
+        {% set m = ((s % 3600) // 60) | int %}
         {% if h > 0 %}{{ h }} h {{ m }} min{% else %}{{ m }} min{% endif %}
 
   - if: