diff --git a/apps/predbat/execute.py b/apps/predbat/execute.py
index 5e33b77d2..dd0108d19 100644
--- a/apps/predbat/execute.py
+++ b/apps/predbat/execute.py
@@ -21,6 +21,7 @@
 from predbat_metrics import metrics
 from inverter import Inverter
 import time
+import asyncio
 
 """
 Execute Predbat plan
@@ -35,6 +36,49 @@ class Execute:
     adjustment, and multi-inverter balancing.
     """
 
+    def lattice_express_control(self, serial, capability, value):
+        """Site control plane: express a control intent and let the Lattice projection fulfil it.
+
+        The inverter layer calls this INSTEAD of writing the inverter itself, handing up the intent
+        (capability + which battery + target). If the projection is enabled and can route it, the
+        intent is dispatched (async — best provider, with gateway/cloud fallback) and True returned.
+        ANY problem returns False so the caller performs its normal per-inverter write: cross-provider
+        routing lives here at the site layer, but control is never lost if Lattice cannot act.
+        """
+        try:
+            registry = getattr(self, "components", None)
+            component = registry.get_component("lattice") if registry else None
+            projection = getattr(component, "projection", None)
+            if projection is None or not serial or serial == "Unknown":
+                return False
+            if not projection.would_handle(capability, "battery-system", serial):
+                return False
+            task = asyncio.get_running_loop().create_task(projection.apply(capability, "battery-system", serial, int(value)))
+            # Hold a strong reference (the loop only keeps a weak one — a fire-and-forget task can be
+            # GC'd mid-flight) and surface async failures, since the inverter has already skipped its
+            # own write. NOTE: a provider dropping between would_handle() and apply() means a one-cycle
+            # skip that self-corrects on the next ~5-min planner pass — it is logged, not silently lost.
+            tasks = getattr(self, "_lattice_tasks", None)
+            if tasks is None:
+                tasks = self._lattice_tasks = set()
+            tasks.add(task)
+
+            def _on_done(finished, cap=capability, sn=serial):
+                tasks.discard(finished)
+                try:
+                    result = finished.result()
+                    if result is not None and not getattr(result, "ok", True):
+                        self.log("Warn: Lattice: {} for {} NOT applied ({}) — will retry next cycle".format(cap, sn, getattr(result, "reason", "")))
+                except Exception as exc:
+                    self.log("Warn: Lattice: {} apply task failed for {}: {}".format(cap, sn, exc))
+
+            task.add_done_callback(_on_done)
+            self.log("Lattice: routed {} for {} = {}W via projection".format(capability, serial, int(value)))
+            return True
+        except Exception as e:
+            self.log("Warn: Lattice: {} handoff failed for {} ({}); using normal write".format(capability, serial, e))
+            return False
+
     def execute_plan(self):
         status_extra = ""  # extra status text added to Predbat notifications
         status_hold_car = ""  # car hold status text
diff --git a/apps/predbat/inverter.py b/apps/predbat/inverter.py
index 5b07c4fc8..dbb0d8715 100644
--- a/apps/predbat/inverter.py
+++ b/apps/predbat/inverter.py
@@ -189,6 +189,13 @@ def __init__(self, base, id=0, quiet=False, rest_postCommand=None, rest_getData=
 
         self.inverter_type = self.base.get_arg("inverter_type", "GE", indirect=False, index=self.id)
 
+        # Lattice node identity: producers (gateway/cloud) publish the real serial per index so the
+        # projection can correlate this inverter with its merged-graph node. REST "GE" overrides this
+        # later from rest_data; for GWMQTT/cloud it is the only serial source.
+        lattice_serial = self.base.get_arg("inverter_serial", default=None, indirect=False, index=self.id)
+        if lattice_serial:
+            self.serial_number = str(lattice_serial)
+
         # Read user defined inverter type
         if "inverter" in self.base.args:
             if self.inverter_type not in INVERTER_DEF:
@@ -1735,6 +1742,8 @@ def adjust_reserve(self, reserve):
             self.base.log("Inverter {} Current Reserve is {}% and new target is {}%".format(self.id, dp0(current_reserve), dp0(reserve)))
             if self.rest_data:
                 self.rest_setReserve(reserve)
+            elif self._lattice_expresses("reserve_soc", reserve):
+                pass  # intent handed to the site control plane (Lattice owns provider + fallback)
             else:
                 self.write_and_poll_value("reserve", self.base.get_arg("reserve", indirect=False, index=self.id, required_unit="%"), reserve)
             if self.base.set_inverter_notify:
@@ -1783,6 +1792,16 @@ def get_current_charge_rate(self):
 
         return current_rate
 
+    def _lattice_expresses(self, capability, value):
+        """Hand this control intent up to the site control plane (execute.lattice_express_control).
+
+        Returns True if the Lattice projection took ownership of the write (best provider + fallback);
+        False (incl. when the host has no site control plane) so the caller does its normal write.
+        Cross-provider routing lives at the site layer, not in this single-inverter class.
+        """
+        express = getattr(self.base, "lattice_express_control", None)
+        return bool(express and express(self.serial_number, capability, value))
+
     def adjust_charge_rate(self, new_rate, notify=True):
         """
         Adjust charging rate
@@ -1811,6 +1830,8 @@ def adjust_charge_rate(self, new_rate, notify=True):
             self.base.log("Inverter {} current charge rate is {}W and new target is {}W".format(self.id, current_rate, new_rate))
             if self.rest_data:
                 self.rest_setChargeRate(new_rate)
+            elif self._lattice_expresses("charge_rate", new_rate):
+                pass  # intent handed to the site control plane (Lattice owns provider + fallback)
             else:
                 if "charge_rate" in self.base.args:
                     self.write_and_poll_value("charge_rate", self.base.get_arg("charge_rate", indirect=False, index=self.id, required_unit="W"), new_rate, fuzzy=(self.battery_rate_max_charge * MINUTE_WATT / 20), required_unit="W")
@@ -1849,6 +1870,8 @@ def adjust_discharge_rate(self, new_rate, notify=True):
             self.base.log("Inverter {} current discharge rate is {}W and new target is {}W".format(self.id, current_rate, new_rate))
             if self.rest_data:
                 self.rest_setDischargeRate(new_rate)
+            elif self._lattice_expresses("discharge_rate", new_rate):
+                pass  # intent handed to the site control plane (Lattice owns provider + fallback)
             else:
                 if "discharge_rate" in self.base.args:
                     self.write_and_poll_value("discharge_rate", self.base.get_arg("discharge_rate", indirect=False, index=self.id), new_rate, fuzzy=(self.battery_rate_max_discharge * MINUTE_WATT / 20), required_unit="W")
@@ -1896,6 +1919,8 @@ def adjust_battery_target(self, soc, isCharging=False, isExporting=False):
             self.current_charge_limit = soc
             if self.rest_data:
                 self.rest_setChargeTarget(soc)
+            elif self._lattice_expresses("target_soc", soc):
+                pass  # intent handed to the site control plane (Lattice owns provider + fallback)
             else:
                 self.write_and_poll_value("charge_limit", self.base.get_arg("charge_limit", indirect=False, index=self.id, required_unit="%"), soc)