diff --git a/dumb-inverter.py b/dumb-inverter.py
new file mode 100644
index 0000000..a26d200
--- /dev/null
+++ b/dumb-inverter.py
@@ -0,0 +1,97 @@
+import json
+import os
+import panel
+from datetime import datetime
+from typing import Any
+
+from pydantic import BaseModel
+
+from watt42_viewlib import attach_w42_state
+
+panel.extension('echarts', 'ace', 'jsoneditor')
+
+SYSTEM_ID = os.environ.get("WATT42_SYSTEM_ID", "invalid-system-id")
+API_TOKEN = os.environ.get("WATT42_API_TOKEN", "invalid-api-token")
+
+w42_state = panel.rx(None)
+
+attach_w42_state(rx_var=w42_state, system_id=SYSTEM_ID, token=API_TOKEN)
+
+class PvForecast(BaseModel):
+    at: datetime = datetime.now()
+    slots: list[float] = []
+
+class LoadForecast(BaseModel):
+    at: datetime = datetime.now()
+    slots: list[float] = []
+
+
+class InverterForecast(BaseModel):
+    levels: list[float] = []
+    
+class SystemState(BaseModel):
+    pv_forecast: PvForecast = PvForecast()
+    load_forecast: LoadForecast = LoadForecast()
+    value: int = 42
+    inverter: InverterForecast = InverterForecast()
+
+def state_to_text(state: dict[str, Any]) -> str:
+    return f"Watt42 State:\n\n```\n{json.dumps(state, indent=2)}\n```\n\nReplace this with some awesome visuals"
+
+state_as_text = panel.bind(state_to_text, w42_state)
+
+state_pane = panel.pane.Markdown(state_as_text, sizing_mode='stretch_width')
+
+def chart1(state: SystemState) -> dict:
+    """ Return an ECharts option dict visualizing some aspect of the state."""
+
+    now = state.load_forecast.at
+    pv_slots = state.pv_forecast.slots
+    load_slots = state.load_forecast.slots
+    hours = list(range(len(pv_slots)))
+    option = {
+        "title": {"text": f"PV and Load Forecast at {now.strftime('%Y-%m-%d %H:%M')}"},
+        "tooltip": {"trigger": "axis"},
+        "legend": {"data": ["PV Forecast", "Load Forecast", "Inverter Level"]},
+        "xAxis": {"type": "category", "data": hours, "name": "Hours"},
+        "yAxis": {"type": "value", "name": "Power (kW)"},
+        "series": [
+            {
+                "name": "PV Forecast",
+                "type": "line",
+                "data": pv_slots,
+            },
+            {
+                "name": "Load Forecast",
+                "type": "line",
+                "data": load_slots,
+            },
+            {
+                "name": "Inverter Level",
+                "type": "line",
+                "data": state.inverter.levels,
+            }
+        ],
+    }
+    return option
+
+chart1_rx = panel.rx(chart1)(panel.rx(lambda s: SystemState.model_validate(s) if s else SystemState())(w42_state))
+
+
+sidebar_content = """
+Demonstrates how to visualize the Watt42 "dumb inverter simulation" system state.
+
+Find instructions on [how to use this example
+here](https://source.c3.uber5.com/watt42-public/watt42_viewlib/src/branch/main/README.md#how-to-use).
+
+"""
+
+_ = panel.template.FastListTemplate(
+    title="Watt42: Dumb Inverter Visualization Example",
+    sidebar=[panel.pane.Markdown(sidebar_content, sizing_mode='stretch_width')],
+    main=[
+        panel.pane.ECharts(chart1_rx, sizing_mode='stretch_width', height=400, theme='light'),
+        state_pane,
+        w42_state,
+    ],
+).servable()
diff --git a/sample2.py b/sample2.py
index 96b4463..d6dfbf0 100644
--- a/sample2.py
+++ b/sample2.py
@@ -1,4 +1,5 @@
 import json
+import os
 import panel
 from datetime import datetime, timedelta
 
@@ -8,8 +9,8 @@ from watt42_viewlib import attach_w42_state
 
 panel.extension('echarts', 'ace', 'jsoneditor')
 
-SYSTEM_ID = "79476e53-dea6-44fa-976c-eff6260baeb6"
-API_TOKEN = "d0vA6CsrY69N3JAOGtuZMEb9QpbJWPcoxhxRyBXZn8SIisB3weLKjMZwQRo8c2k9BRDtK0qHYnsvUMnqeO7Xog"
+SYSTEM_ID = os.environ.get("WATT42_SYSTEM_ID", "invalid-system-id")
+API_TOKEN = os.environ.get("WATT42_API_TOKEN", "invalid-api-token")
 
 w42_state = panel.rx(None)
 
diff --git a/watt42_viewlib/__init__.py b/watt42_viewlib/__init__.py
index 7f733d0..ca8dd0d 100644
--- a/watt42_viewlib/__init__.py
+++ b/watt42_viewlib/__init__.py
@@ -1,6 +1,7 @@
 import asyncio
 import json
 import logging
+import os
 import panel
 
 from websockets import ConnectionClosed
@@ -8,9 +9,11 @@ from websockets.asyncio.client import connect
 
 logger = logging.getLogger(__name__)
 
+default_ws_url = "wss://service.watt42.com/ws/systems"
+
 def attach_w42_state(rx_var: panel.rx, system_id: str, token: str):
 
-    WS_URL = "ws://localhost:8000/ws/systems" # TODO: make configurable
+    WS_URL = os.environ.get("WATT42_WS_URL", default_ws_url)
 
     must_reconnect = True