diff --git a/solax/inverters/__init__.py b/solax/inverters/__init__.py
index 883e9d3..14746ca 100644
--- a/solax/inverters/__init__.py
+++ b/solax/inverters/__init__.py
@@ -10,6 +10,7 @@
 from .x3_mic_pro_g2 import X3MicProG2
 from .x3_v34 import X3V34
 from .x_hybrid import XHybrid
+from .x3_ultra import X3Ultra
 
 __all__ = [
     "QVOLTHYBG33P",
@@ -24,4 +25,5 @@
     "X1Boost",
     "X1HybridGen4",
     "X3MicProG2",
+    "X3Ultra",
 ]
diff --git a/solax/inverters/x3_ultra.py b/solax/inverters/x3_ultra.py
new file mode 100644
index 0000000..dd2ae20
--- /dev/null
+++ b/solax/inverters/x3_ultra.py
@@ -0,0 +1,134 @@
+import voluptuous as vol
+
+from solax.inverter import Inverter
+from solax.units import Total, Units
+from solax.utils import (
+    div10,
+    div100,
+    pack_u16,
+    to_signed,
+    to_signed32,
+    twoway_div10,
+    twoway_div100,
+)
+
+
+class X3Ultra(Inverter):
+    """X3 Hybrid G4 v3.006.04"""
+
+    # pylint: disable=duplicate-code
+    _schema = vol.Schema(
+        {
+            vol.Required("type"): vol.All(int, 25),
+            vol.Required("sn"): str,
+            vol.Required("ver"): str,
+            vol.Required("Data"): vol.Schema(
+                vol.All(
+                    [vol.Coerce(float)],
+                    vol.Length(min=300, max=300),
+                )
+            ),
+            vol.Required("Information"): vol.Schema(
+                vol.All(vol.Length(min=10, max=10))
+            ),
+        },
+        extra=vol.REMOVE_EXTRA,
+    )
+
+    @classmethod
+    def build_all_variants(cls, host, port, pwd=""):
+        return [cls._build(host, port, pwd, False)]
+
+    @classmethod
+    def _decode_run_mode(cls, run_mode):
+        return {
+            0: "Waiting",
+            1: "Checking",
+            2: "Normal",
+            3: "Fault",
+            4: "Permanent Fault",
+            5: "Updating",
+            6: "EPS Check",
+            7: "EPS Mode",
+            8: "Self Test",
+            9: "Idle",
+            10: "Standby",
+        }.get(run_mode)
+
+    @classmethod
+    def _decode_battery_mode(cls, battery_mode):
+        return {
+            0: "Self Use Mode",
+            1: "Force Time Use",
+            2: "Back Up Mode",
+            3: "Feed-in Priority",
+        }.get(battery_mode)
+
+    @classmethod
+    def response_decoder(cls):
+        return {
+            "Grid 1 Voltage": (0, Units.V, div10),
+            "Grid 2 Voltage": (1, Units.V, div10),
+            "Grid 3 Voltage": (2, Units.V, div10),
+            "Grid 1 Current": (3, Units.A, twoway_div10),
+            "Grid 2 Current": (4, Units.A, twoway_div10),
+            "Grid 3 Current": (5, Units.A, twoway_div10),
+            "Grid 1 Power": (6, Units.W, to_signed),
+            "Grid 2 Power": (7, Units.W, to_signed),
+            "Grid 3 Power": (8, Units.W, to_signed),
+            "PV1 Voltage": (10, Units.V, div10),
+            "PV2 Voltage": (11, Units.V, div10),
+            "PV3 Voltage": (129, Units.V, div10),
+            "PV1 Current": (12, Units.A, div10),
+            "PV2 Current": (13, Units.A, div10),
+            "PV3 Current": (130, Units.A, div10),
+            "PV1 Power": (14, Units.W),
+            "PV2 Power": (15, Units.W),
+            "PV3 Power": (131, Units.W),
+            "Grid 1 Frequency": (16, Units.HZ, div100),
+            "Grid 2 Frequency": (17, Units.HZ, div100),
+            "Grid 3 Frequency": (18, Units.HZ, div100),
+            "Run mode": (19, Units.NONE),
+            "Run mode text": (19, Units.NONE, X3Ultra._decode_run_mode),
+            "EPS 1 Voltage": (23, Units.V, div10),
+            "EPS 2 Voltage": (24, Units.V, div10),
+            "EPS 3 Voltage": (25, Units.V, div10),
+            "EPS 1 Current": (26, Units.A, twoway_div10),
+            "EPS 2 Current": (27, Units.A, twoway_div10),
+            "EPS 3 Current": (28, Units.A, twoway_div10),
+            "EPS 1 Power": (29, Units.W, to_signed),
+            "EPS 2 Power": (30, Units.W, to_signed),
+            "EPS 3 Power": (31, Units.W, to_signed),
+            "Grid Power ": (pack_u16(34, 35), Units.W, to_signed32),
+            # 'Battery Voltage' is twice in the json response and covered with 169, 170 below.
+            # "Battery Voltage": (39, Units.V, div100),
+            "Battery Current": (40, Units.A, twoway_div100),
+            "Battery Power": (41, Units.W, to_signed),
+            "Load/Generator Power": (47, Units.W, to_signed),
+            "Radiator Temperature": (54, Units.C, to_signed),
+            "Yield total": (pack_u16(68, 69), Total(Units.KWH), div10),
+            "Yield today": (70, Units.KWH, div10),
+            "Battery Discharge Energy total": (
+                pack_u16(74, 75),
+                Total(Units.KWH),
+                div10,
+            ),
+            "Battery Charge Energy total": (pack_u16(76, 77), Total(Units.KWH), div10),
+            "Battery Discharge Energy today": (78, Units.KWH, div10),
+            "Battery Charge Energy today": (79, Units.KWH, div10),
+            "PV Energy total": (pack_u16(80, 81), Total(Units.KWH), div10),
+            "EPS Energy total": (pack_u16(83, 84), Total(Units.KWH), div10),
+            "EPS Energy today": (85, Units.KWH, div10),
+            "Feed-in Energy": (pack_u16(86, 87), Total(Units.KWH), div100),
+            "Consumed Energy": (pack_u16(88, 89), Total(Units.KWH), div100),
+            "Feed-in Energy total": (pack_u16(90, 91), Total(Units.KWH), div100),
+            "Consumed Energy total": (pack_u16(92, 93), Total(Units.KWH), div100),
+            "Battery Remaining Capacity": (103, Units.PERCENT),
+            "Battery Temperature": (105, Units.C, to_signed),
+            "Battery Remaining Energy": (106, Units.KWH, div10),
+            "Battery mode": (168, Units.NONE),
+            "Battery mode text": (168, Units.NONE, X3HybridG4._decode_battery_mode),
+            "Battery Voltage": (pack_u16(169, 170), Units.V, div100),
+        }
+
+    # pylint: enable=duplicate-code