fix #278

tools/esp8266/web.cpp

@@ -240,6 +240,7 @@ void web::showSave(AsyncWebServerRequest *request) {
             // active power limit
             uint16_t actPwrLimit = request->arg("inv" + String(i) + "ActivePowerLimit").toInt();
             uint16_t actPwrLimitControl = request->arg("inv" + String(i) + "PowerLimitControl").toInt();
+            if(NoPowerLimit != actPwrLimitControl) {
                 if (actPwrLimit != 0xffff && actPwrLimit > 0){
                     iv->powerLimit[0] = actPwrLimit;
                     iv->powerLimit[1] = actPwrLimitControl;
@@ -259,6 +260,7 @@ void web::showSave(AsyncWebServerRequest *request) {
                     iv->devControlRequest = true;
                     DPRINTLN(DBG_INFO, F("Power limit for inverter ") + String(iv->id) + F(" set to unlimted"));
                 }
+            }
                 
             // name
             request->arg("inv" + String(i) + "Name").toCharArray(iv->name, MAX_NAME_LENGTH);