diff --git a/tools/esp8266/html/api.js b/tools/esp8266/html/api.js
index c896c42b..f793551a 100644
--- a/tools/esp8266/html/api.js
+++ b/tools/esp8266/html/api.js
@@ -79,3 +79,7 @@ function span(val, cl=null, id=null) {
     if(null != id) e.id = id;
     return e;
 }
+
+function br() {
+    return document.createElement('br');
+}
diff --git a/tools/esp8266/html/setup.html b/tools/esp8266/html/setup.html
index adfddea7..2021a11f 100644
--- a/tools/esp8266/html/setup.html
+++ b/tools/esp8266/html/setup.html
@@ -47,7 +47,7 @@
                     <fieldset>
                     <legend class="des">Inverter</legend>
                         <div id="inverter"></div><br/>
-                        <input type="button" name="btnAdd" value="Add Inverter"/>
+                        <input type="button" id="btnAdd" value="Add Inverter"/>
                         <p class="subdes">General</p>
                         <label for="invInterval">Interval [s]</label>
                         <input type="text" class="text" name="invInterval"/>
@@ -132,8 +132,8 @@
 
             const re = /11[2,4,6]1.*/;
 
-            document.getElementsByName("btnAdd")[0].addEventListener("click", function() {
-                if(highestId < (maxInv-1))
+            document.getElementById("btnAdd").addEventListener("click", function() {
+                if(highestId <= (maxInv-1))
                     ivHtml(JSON.parse('{"name":"","serial":"","channels":4,"ch_max_power":[0,0,0,0],"ch_name":["","","",""]}'), highestId + 1);
             });
 
@@ -174,6 +174,14 @@
                 getAjax("/api/setup", apiCbMqtt, "POST", JSON.stringify(obj));
             }
 
+            function delIv() {
+                var id = this.id.substring(0,4);
+                var e = document.getElementsByName(id + "Addr")[0];
+                e.value = "";
+                e.dispatchEvent(new Event("keyup"));
+                document.getElementsByName(id + "Name")[0].value = "";
+            }
+
             function ivHtml(obj, id) {
                 highestId = id;
                 if(highestId == (maxInv - 1))
@@ -182,6 +190,7 @@
                 iv.appendChild(des("Inverter " + id));
                 id = "inv" + id;
 
+
                 iv.appendChild(lbl(id + "Addr", "Address*"));
                 var addr = inp(id + "Addr", obj["serial"], 12)
                 iv.appendChild(addr);
@@ -226,6 +235,11 @@
                     }
                     iv.appendChild(d);
                 }
+                iv.appendChild(br());
+                iv.appendChild(lbl(id + "lbldel", "Delete"));
+                var del = inp(id+"del", "X", 0, ["btn", "btnDel"], id+"del", "button");
+                iv.appendChild(del);
+                del.addEventListener("click", delIv);
             }
 
             function ivGlob(obj) {
diff --git a/tools/esp8266/html/style.css b/tools/esp8266/html/style.css
index e58efab3..d6f0070c 100644
--- a/tools/esp8266/html/style.css
+++ b/tools/esp8266/html/style.css
@@ -129,6 +129,10 @@ input.sh {
     margin-right: 10px;
 }
 
+input.btnDel {
+    background-color: #c00 !important;
+}
+
 input.btn {
     background-color: #006ec0;
     color: #fff;
diff --git a/tools/esp8266/web.cpp b/tools/esp8266/web.cpp
index 0b64f6ba..5891fbe1 100644
--- a/tools/esp8266/web.cpp
+++ b/tools/esp8266/web.cpp
@@ -236,6 +236,12 @@ void web::showSave(AsyncWebServerRequest *request) {
             if(strlen(buf) == 0)
                 memset(buf, 0, 20);
             iv->serial.u64 = mMain->Serial2u64(buf);
+            switch(iv->serial.b[4]) {
+                case 0x21: iv->type = INV_TYPE_1CH; iv->channels = 1; break;
+                case 0x41: iv->type = INV_TYPE_2CH; iv->channels = 2; break;
+                case 0x61: iv->type = INV_TYPE_4CH; iv->channels = 4; break;
+                default:  break;
+            }
 
             // name
             request->arg("inv" + String(i) + "Name").toCharArray(iv->name, MAX_NAME_LENGTH);