diff --git a/backend/services/control/deye_helpers.py b/backend/services/control/deye_helpers.py
index b14aae5..936f11a 100644
--- a/backend/services/control/deye_helpers.py
+++ b/backend/services/control/deye_helpers.py
@@ -146,9 +146,11 @@ def _deye_reg178_verify_with_double_read(
 
 
 def watts_to_amps(power_w: int | None, phases: int = 3, voltage: int = 230) -> int:
+    # round(), NE int(): 11 kW / (3×230) = 15.94 A → int useklo na 15 A (~10.35 kW,
+    # −6 % výkonu); round dá správných 16 A (~11 kW). Strop 32 A drží horní mez.
     if not power_w or power_w <= 0:
         return 0
-    return min(32, max(0, int(power_w / (phases * voltage))))
+    return min(32, max(0, round(power_w / (phases * voltage))))
 
 
 def battery_watts_to_amps(power_w: int, max_amps: int) -> int: