diff --git a/includes/discovery/voltages/sentry3.inc.php b/includes/discovery/voltages/sentry3.inc.php
new file mode 100644
index 0000000000..a031cdb26e
--- /dev/null
+++ b/includes/discovery/voltages/sentry3.inc.php
@@ -0,0 +1,60 @@
+<?php
+
+global $valid_sensor;
+
+if ($device['os'] == "sentry3")
+{
+  $oids = snmp_walk($device, "infeedVoltage", "-OsqnU", "Sentry3-MIB");
+  if ($debug) { echo($oids."\n"); }
+  if ($oids) echo("Sentry3-MIB ");
+  $divisor = 10;
+  $type = "sentry3";
+
+  foreach (explode("\n", $oids) as $data)
+  {
+    $data = trim($data);
+    if ($data)
+    {
+      list($oid,$descr) = explode(" ", $data,2);
+      $split_oid = explode('.',$oid);
+      $descr = "Tower " . $index;
+      $index = $split_oid[count($split_oid)-1];
+      $oid  = "1.3.6.1.4.1.1718.3.2.2.1.11.1." . $index;
+      $current = snmp_get($device, $oid, "-Oqv") / $divisor;
+
+      discover_sensor($valid_sensor, 'voltage', $device, $oid, $index, $type, $descr, $divisor, '1', NULL, NULL, NULL, NULL, $current);
+    }
+  }
+}
+
+?>
+<?php
+
+global $valid_sensor;
+
+if ($device['os'] == "sentry3")
+{
+  $oids = snmp_walk($device, "infeedVoltage", "-OsqnU", "Sentry3-MIB");
+  if ($debug) { echo($oids."\n"); }
+  if ($oids) echo("Sentry3-MIB ");
+  $divisor = 10;
+  $type = "sentry3";
+
+  foreach (explode("\n", $oids) as $data)
+  {
+    $data = trim($data);
+    if ($data)
+    {
+      list($oid,$descr) = explode(" ", $data,2);
+      $split_oid = explode('.',$oid);
+      $descr = "Tower " . $index;
+      $index = $split_oid[count($split_oid)-1];
+      $oid  = "1.3.6.1.4.1.1718.3.2.2.1.11." . $index . ".1";
+      $current = snmp_get($device, $oid, "-Oqv") / $divisor;
+
+      discover_sensor($valid_sensor, 'voltage', $device, $oid, $index, $type, $descr, $divisor, '1', NULL, NULL, NULL, NULL, $current);
+    }
+  }
+}
+
+?>