diff --git a/docs/Accessories.md b/docs/Accessories.md
index 86fa0cc..36b6744 100644
--- a/docs/Accessories.md
+++ b/docs/Accessories.md
@@ -787,7 +787,9 @@ Set `confirmationPeriodms` to enable publishing confirmation for `setOn`/`getOn`
     "onValue": "<value representing on (optional)>",
     "offValue": "<value representing off (optional)>",
     "turnOffAfterms": "<milliseconds after which to turn off automatically (optional)>",
-    "history": "<true to enable History service for Eve App (optional)>"
+    "history": "<true to enable History service for Eve App (optional)>",
+    "minVolts": "<minumum voltage (optional)>",
+    "maxVolts": "<maximum voltage (optional)>"
 }
 ```
 
diff --git a/docs/ReleaseNotes.md b/docs/ReleaseNotes.md
index 64b0184..1e348b6 100644
--- a/docs/ReleaseNotes.md
+++ b/docs/ReleaseNotes.md
@@ -5,6 +5,9 @@
 
 # Homebridge MQTT-Thing: Release Notes
 
+### Version 1.1.40
++ Added configurable minimum and maximum voltage for outlet (minVolts, maxVolts)
+
 ### Version 1.1.39
 + Fix RGB light validation errors (issue #510)
 
diff --git a/index.js b/index.js
index c5919f5..6f25b3f 100644
--- a/index.js
+++ b/index.js
@@ -1168,12 +1168,38 @@ function makeThing( log, accessoryConfig, api ) {
                 }
             }
 
-            function floatCharacteristic( service, property, characteristic, setTopic, getTopic, initialValue ) {
-                // default state
-                state[ property ] = initialValue;
+            function floatCharacteristic( service, property, characteristic, setTopic, getTopic, options ) {
+
+                if( options === undefined ) {
+                    options = {};
+                } else if( typeof options === 'number' ) {
+                    options = { initialValue: options };
+                }
+                let initialValue = options.initialValue || 0;
 
                 // set up characteristic
                 var charac = service.getCharacteristic( characteristic );
+
+                if( options.minValue !== undefined ) {
+                    charac.props.minValue = options.minValue;
+                }
+
+                if( options.maxValue !== undefined ) {
+                    charac.props.maxValue = options.maxValue;
+                }
+
+                if( initialValue < charac.props.minValue ) {
+                    initialValue = charac.props.minValue;
+                }
+
+                if( initialValue > charac.props.maxValue ) {
+                    initialValue = charac.props.maxValue;
+                }
+
+                // default state
+                state[ property ] = initialValue;
+
+                // get/set
                 charac.on( 'get', function( callback ) {
                     handleGetStateCallback( callback, state[ property ] );
                 } );
@@ -2315,7 +2341,9 @@ function makeThing( log, accessoryConfig, api ) {
             // Eve.Characteristics.Voltage [Volts] (Eve-only)
             function characteristic_Voltage( service ) {
                 service.addOptionalCharacteristic( Eve.Characteristics.Voltage ); // to avoid warnings
-                floatCharacteristic( service, 'voltage', Eve.Characteristics.Voltage, null, config.topics.getVolts, 100 );
+                floatCharacteristic( service, 'voltage', Eve.Characteristics.Voltage, null, config.topics.getVolts, {
+                    minValue: config.minVolts, maxValue: config.maxVolts
+                } );
             }
 
             // Eve.Characteristics.ElectricCurrent [Amperes] (Eve-only)
diff --git a/package.json b/package.json
index 1844fc6..949e806 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "homebridge-mqttthing",
-  "version": "1.1.39",
+  "version": "1.1.40",
   "description": "Homebridge plugin supporting various services over MQTT",
   "main": "index.js",
   "scripts": {
diff --git a/test2/config.json b/test2/config.json
index f3ebdfa..12ec50a 100644
--- a/test2/config.json
+++ b/test2/config.json
@@ -14,18 +14,6 @@
         }
     ],
     "disabledAccessories": [
-        {
-            "type": "outlet",
-            "name": "Test Outlet",
-            "url": "homebridge2",
-            "topics": {
-                "setOn": "test/outlet/on",
-                "getWatts": "test/outlet/watts",
-                "getVolts": "test/outlet/voltage"
-            },
-            "accessory": "mqttthing",
-            "logMqtt": true
-        },
         {
             "type": "lightbulb-ColTemp",
             "name": "Light-Temp",
@@ -599,6 +587,22 @@
         }
     ],
     "accessories": [
+        {
+            "type": "outlet",
+            "name": "Test Outlet",
+            "url": "homebridge2",
+            "topics": {
+                "setOn": "test/outlet/on",
+                "getInUse": "test/outlet/inuse",
+                "getWatts": "test/outlet/watts",
+                "getVolts": "test/outlet/voltage",
+                "getAmperes": "test/outlet/amps"
+            },
+            "accessory": "mqttthing",
+            "logMqtt": true,
+            "minVolts": 0,
+            "maxVolts": 30
+        },
         {
             "accessory": "mqttthing",
             "type": "lightbulb",
@@ -622,6 +626,17 @@
             "turnOffAfterms": "120000",
             "onlineValue": "ON",
             "offlineValue": "OFF"
+        }, {
+            "accessory": "mqttthing",
+            "type": "lightbulb",
+            "url": "homebridge2",
+            "name": "Simple light",
+            "topics": {
+                "getOn": "fake/light/getOn",
+                "setOn": "fake/light/setOn"
+            },
+            "integerValue": true,
+            "logMqtt": true
         }
     ]
 }