diff --git a/main.py b/main.py
index 818e202..0e0058d 100644
--- a/main.py
+++ b/main.py
@@ -10,6 +10,7 @@ unit_id = 1
 # Liste von interessanten Holding-Register-Adressen
 registers = {
     300: {'desc': 'Außentemperatur in °C', 'type': 'REAL'},
+    315: {'desc': 'Spannung FU Ausgang in V', 'type': 'REAL'},
 }
 
 client = ModbusTcpClient(ip, port=port)