diff --git a/include/WebApi.h b/include/WebApi.h
index 14eddc3..b6fdbd0 100644
--- a/include/WebApi.h
+++ b/include/WebApi.h
@@ -39,6 +39,7 @@ public:
     static void writeConfig(JsonVariant& retMsg, const WebApiError code = WebApiError::GenericSuccess, const String& message = "Settings saved!");
 
     static bool parseRequestData(AsyncWebServerRequest* request, AsyncJsonResponse* response, JsonDocument& json_document);
+    static uint64_t parseSerialFromRequest(AsyncWebServerRequest* request, String param_name = "inv");
     static bool sendJsonResponse(AsyncWebServerRequest* request, AsyncJsonResponse* response, const char* function, const uint16_t line);
 
 private:
diff --git a/src/WebApi.cpp b/src/WebApi.cpp
index bd59bd3..1a5b287 100644
--- a/src/WebApi.cpp
+++ b/src/WebApi.cpp
@@ -110,6 +110,16 @@ bool WebApiClass::parseRequestData(AsyncWebServerRequest* request, AsyncJsonResp
     return true;
 }
 
+uint64_t WebApiClass::parseSerialFromRequest(AsyncWebServerRequest* request, String param_name)
+{
+    if (request->hasParam(param_name)) {
+        String s = request->getParam(param_name)->value();
+        return strtoll(s.c_str(), NULL, 16);
+    }
+
+    return 0;
+}
+
 bool WebApiClass::sendJsonResponse(AsyncWebServerRequest* request, AsyncJsonResponse* response, const char* function, const uint16_t line)
 {
     bool ret_val = true;
diff --git a/src/WebApi_devinfo.cpp b/src/WebApi_devinfo.cpp
index 68f3396..449cd17 100644
--- a/src/WebApi_devinfo.cpp
+++ b/src/WebApi_devinfo.cpp
@@ -23,13 +23,7 @@ void WebApiDevInfoClass::onDevInfoStatus(AsyncWebServerRequest* request)
 
     AsyncJsonResponse* response = new AsyncJsonResponse();
     auto& root = response->getRoot();
-
-    uint64_t serial = 0;
-    if (request->hasParam("inv")) {
-        String s = request->getParam("inv")->value();
-        serial = strtoll(s.c_str(), NULL, 16);
-    }
-
+    auto serial = WebApi.parseSerialFromRequest(request);
     auto inv = Hoymiles.getInverterBySerial(serial);
 
     if (inv != nullptr) {
diff --git a/src/WebApi_eventlog.cpp b/src/WebApi_eventlog.cpp
index e2d3444..ec8b78c 100644
--- a/src/WebApi_eventlog.cpp
+++ b/src/WebApi_eventlog.cpp
@@ -22,12 +22,7 @@ void WebApiEventlogClass::onEventlogStatus(AsyncWebServerRequest* request)
 
     AsyncJsonResponse* response = new AsyncJsonResponse();
     auto& root = response->getRoot();
-
-    uint64_t serial = 0;
-    if (request->hasParam("inv")) {
-        String s = request->getParam("inv")->value();
-        serial = strtoll(s.c_str(), NULL, 16);
-    }
+    auto serial = WebApi.parseSerialFromRequest(request);
 
     AlarmMessageLocale_t locale = AlarmMessageLocale_t::EN;
     if (request->hasParam("locale")) {
diff --git a/src/WebApi_gridprofile.cpp b/src/WebApi_gridprofile.cpp
index 5ed579d..9fc05b0 100644
--- a/src/WebApi_gridprofile.cpp
+++ b/src/WebApi_gridprofile.cpp
@@ -23,13 +23,7 @@ void WebApiGridProfileClass::onGridProfileStatus(AsyncWebServerRequest* request)
 
     AsyncJsonResponse* response = new AsyncJsonResponse();
     auto& root = response->getRoot();
-
-    uint64_t serial = 0;
-    if (request->hasParam("inv")) {
-        String s = request->getParam("inv")->value();
-        serial = strtoll(s.c_str(), NULL, 16);
-    }
-
+    auto serial = WebApi.parseSerialFromRequest(request);
     auto inv = Hoymiles.getInverterBySerial(serial);
 
     if (inv != nullptr) {
@@ -66,13 +60,7 @@ void WebApiGridProfileClass::onGridProfileRawdata(AsyncWebServerRequest* request
 
     AsyncJsonResponse* response = new AsyncJsonResponse();
     auto& root = response->getRoot();
-
-    uint64_t serial = 0;
-    if (request->hasParam("inv")) {
-        String s = request->getParam("inv")->value();
-        serial = strtoll(s.c_str(), NULL, 16);
-    }
-
+    auto serial = WebApi.parseSerialFromRequest(request);
     auto inv = Hoymiles.getInverterBySerial(serial);
 
     if (inv != nullptr) {
diff --git a/src/WebApi_ws_live.cpp b/src/WebApi_ws_live.cpp
index e79c664..eb1a83b 100644
--- a/src/WebApi_ws_live.cpp
+++ b/src/WebApi_ws_live.cpp
@@ -224,14 +224,8 @@ void WebApiWsLiveClass::onLivedataStatus(AsyncWebServerRequest* request)
         std::lock_guard<std::mutex> lock(_mutex);
         AsyncJsonResponse* response = new AsyncJsonResponse();
         auto& root = response->getRoot();
-
         auto invArray = root["inverters"].to<JsonArray>();
-
-        uint64_t serial = 0;
-        if (request->hasParam("inv")) {
-            String s = request->getParam("inv")->value();
-            serial = strtoll(s.c_str(), NULL, 16);
-        }
+        auto serial = WebApi.parseSerialFromRequest(request);
 
         if (serial > 0) {
             auto inv = Hoymiles.getInverterBySerial(serial);