From 5160f3a53e1f99a873b22d87fbfe18f71d78d118 Mon Sep 17 00:00:00 2001
From: oddlama <oddlama@oddlama.org>
Date: Fri, 1 Aug 2025 22:30:55 +0200
Subject: [PATCH] feat: add solar return energy to home assistant

---
 .../hass-modbus/mennekes-amtron-xtra.nix      |  1 +
 hosts/sausebiene/home-assistant.nix           | 21 +++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/hosts/sausebiene/hass-modbus/mennekes-amtron-xtra.nix b/hosts/sausebiene/hass-modbus/mennekes-amtron-xtra.nix
index 6e608f9..56c8e3d 100644
--- a/hosts/sausebiene/hass-modbus/mennekes-amtron-xtra.nix
+++ b/hosts/sausebiene/hass-modbus/mennekes-amtron-xtra.nix
@@ -47,6 +47,7 @@
         ];
       }
     ];
+
     template = [
       {
         sensor = [
diff --git a/hosts/sausebiene/home-assistant.nix b/hosts/sausebiene/home-assistant.nix
index 36019f8..46e3e24 100644
--- a/hosts/sausebiene/home-assistant.nix
+++ b/hosts/sausebiene/home-assistant.nix
@@ -43,6 +43,7 @@ in
     enable = true;
     extraComponents = [
       "esphome"
+      "forecast_solar"
       "fritzbox"
       "matter"
       "met"
@@ -160,6 +161,26 @@ in
           types = [ "Papiermüll" ];
         }
       ];
+
+      template = [
+        {
+          sensor = [
+            {
+              name = "Total Grid Return Energy";
+              unique_id = "calculated_total_grid_return_energy";
+              device_class = "energy";
+              unit_of_measurement = "kWh";
+              state_class = "total_increasing";
+              state = ''
+                {% set solar = states('sensor.pro3em_solar_total_active_energy') | float(0) %}
+                {% set mains = states('sensor.pro3em_mains_total_active_energy') | float(0) %}
+                {% set export = solar - mains %}
+                {{ [export, 0] | max }}
+              '';
+            }
+          ];
+        }
+      ];
     };
 
     extraPackages =