diff --git a/haos-addon/src/main.py b/haos-addon/src/main.py
index 6f33dbf..c3225e1 100644
--- a/haos-addon/src/main.py
+++ b/haos-addon/src/main.py
@@ -155,9 +155,10 @@ def _get_pv_surplus() -> float:
             if not d.get("modbus_ok") or not d.get("values"):
                 continue
             v = d["values"]
-            # Goodwe ET: active_power < 0 bedeutet Einspeisung ins Netz
+            # Goodwe ET: active_power > 0 = Einspeisung, < 0 = Netzbezug
+            # house_consumption = ppv + pbattery1 - active_power (Bibliotheks-Formel)
             if "active_power" in v:
-                surplus += max(0.0, -v["active_power"])
+                surplus += max(0.0, v["active_power"])
             # Growatt
             if "power_to_grid" in v:
                 surplus += max(0.0, v["power_to_grid"])