Allow dangling ports on EVs

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Changelog
 
+## Unreleased
+
+#### Adds
+
+- Adds support for unconnected (dangling) ports by setting `all_dangling_port` to True.
+
+#### Changes
+
+- Prevents warnings for unconnected (dangling) ports on EVs.
+
+
 ## Releases
 
 ### v2.2.6 (2026-08-10)

src/echo/models/base.py

@@ -67,6 +67,7 @@ class Port(BaseModel):
     active_periods: dict[tuple[int, int], Any] | None = None
     slack: bool = False
     objective: en.numeric_expr.NumericExpression | float = 0  # this will eventually be a pyomo expression
+    allow_dangling_port: bool = False
 
     # Validators for import/export constraint values
     import_con_sign = validator("import_constraint_value", allow_reuse=True)(import_cons_check)
@@ -1435,11 +1436,12 @@ def print_port_names(self) -> None:
             for pn, p in n.ports.items():
                 print(pn, ", ", p.port_name)
 
-    def get_port_names_from_nodes(self) -> set[str]:
+    def get_port_names_from_nodes(self, skip_dangling_ports: bool = False) -> set[str]:
         output = set()
         for n in self.node_obj.values():
             for p in n.ports.values():
-                output.add(p.port_name)
+                if skip_dangling_ports and not p.allow_dangling_port:
+                    output.add(p.port_name)
         return output
 
     def get_port_names_from_edges(self) -> set[str]:
@@ -1454,7 +1456,7 @@ def verify_graph(self) -> None:
         are unconnected ports"""
         validate(nx.is_connected(self.convert_to_nx()) is True, "Graph is not connected.")
         # Check graph for ports that are not connected
-        ports_on_edges = self.get_port_names_from_nodes()
+        ports_on_edges = self.get_port_names_from_nodes(skip_dangling_ports=True)
         ports_on_nodes = self.get_port_names_from_edges()
         diff = ports_on_edges - ports_on_nodes  # check overlap
         if len(diff) != 0:

src/echo/models/electrical.py

@@ -272,7 +272,8 @@ def _create_usage_port(self) -> None:
         """
 
         # Create the usage port and assign it to the EV object
-        self.ports["usage"] = ElectricalDemand()
+        # Usage ports are not connected to other ports via edges so we set `allow_dangling_port` to True
+        self.ports["usage"] = ElectricalDemand(allow_dangling_port=True)
 
         # TODO: Set demand here if set_stateful_attrs_at_init is True
 
@@ -303,6 +304,7 @@ def _create_vehicle_port(self) -> None:
             enable_trip_slack=self.enable_trip_slack,
             soc_conserv=self.soc_conserv,
             soc_conserv_cost=self.soc_conserv_cost,
+            allow_dangling_port=True,  # vehicle port is not connect to another port
         )
 
     def _create_connection_point_port(self) -> None: