diff --git a/rdtech-controller-c3.yaml b/rdtech-controller-c3.yaml
index f2b258e..f38f4fa 100644
--- a/rdtech-controller-c3.yaml
+++ b/rdtech-controller-c3.yaml
@@ -337,6 +337,15 @@ text_sensor:
         - 60065 -> RD6006P
         - 60121 -> RD6012
         - 60181 -> RD6018
+  # Single source of truth for regulation mode; published from cv_mode binary
+  # sensor (see binary_sensor: section). Use this in lieu of the legacy
+  # "Constant Voltage" / "Constant Current" binary sensors which are kept for
+  # backward compatibility but represent the same underlying bit.
+  - platform: template
+    id: regulation_mode
+    name: "Regulation Mode"
+    icon: "mdi:tune-variant"
+    update_interval: never
 
 binary_sensor:
   - platform: modbus_controller
@@ -370,7 +379,12 @@ binary_sensor:
     address: 16
     register_type: holding
     bitmask: 0x2
+  # Note: "Constant Voltage" and "Constant Current" below are kept for
+  # backward compatibility. They derive from the same bit and are tautologically
+  # opposite. Prefer the "Regulation Mode" text_sensor (above in text_sensor:)
+  # which exposes the mode as "CV" / "CC" directly.
   - platform: modbus_controller
+    id: cv_mode
     modbus_controller_id: powersupply
     name: "Constant Voltage"
     address: 17
@@ -378,6 +392,10 @@ binary_sensor:
     bitmask: 0x1
     filters:
       - invert:
+    on_state:
+      then:
+        - lambda: |-
+            id(regulation_mode).publish_state(x ? "CV" : "CC");
   - platform: modbus_controller
     modbus_controller_id: powersupply
     name: "Constant Current"
diff --git a/rdtech-controller.yaml b/rdtech-controller.yaml
index d87db69..7072968 100644
--- a/rdtech-controller.yaml
+++ b/rdtech-controller.yaml
@@ -335,6 +335,15 @@ text_sensor:
         - 60065 -> RD6006P
         - 60121 -> RD6012
         - 60181 -> RD6018
+  # Single source of truth for regulation mode; published from cv_mode binary
+  # sensor (see binary_sensor: section). Use this in lieu of the legacy
+  # "Constant Voltage" / "Constant Current" binary sensors which are kept for
+  # backward compatibility but represent the same underlying bit.
+  - platform: template
+    id: regulation_mode
+    name: "Regulation Mode"
+    icon: "mdi:tune-variant"
+    update_interval: never
 
 binary_sensor:
   - platform: modbus_controller
@@ -368,7 +377,12 @@ binary_sensor:
     address: 16
     register_type: holding
     bitmask: 0x2
+  # Note: "Constant Voltage" and "Constant Current" below are kept for
+  # backward compatibility. They derive from the same bit and are tautologically
+  # opposite. Prefer the "Regulation Mode" text_sensor (above in text_sensor:)
+  # which exposes the mode as "CV" / "CC" directly.
   - platform: modbus_controller
+    id: cv_mode
     modbus_controller_id: powersupply
     name: "Constant Voltage"
     address: 17
@@ -376,6 +390,10 @@ binary_sensor:
     bitmask: 0x1
     filters:
       - invert:
+    on_state:
+      then:
+        - lambda: |-
+            id(regulation_mode).publish_state(x ? "CV" : "CC");
   - platform: modbus_controller
     modbus_controller_id: powersupply
     name: "Constant Current"