What is Node-RED?
Node-RED is a visual programming tool that acts as the brain of your automation system. Instead of writing code, you connect blocks (called nodes) together to create automation flows. It runs on a device in your home and makes decisions based on external data.
Think of it as the conductor of an orchestra, it listens to weather data, electricity prices, and your smart devices, then coordinates actions automatically.
What the system enables:
- Prepares for power outages before they happen
- Reduces energy costs by optimising usage timing
- Controls smart devices automatically based on conditions
- Sends alerts and notifications when action is needed
What You Need
To build this system, you need a few key components. The good news is most are affordable and work with devices you may already own.
Node-RED Host
Raspberry Pi (~$50) or Docker on existing hardware (NAS, mini PC).
Weather API
Free options like OpenWeatherMap provide forecasts, alerts, and conditions.
Smart Hub
Amazon Echo, Homey, or Home Assistant for device control.
Smart Power Devices
Smart plugs, backup batteries, or power stations that support remote control.
Battery backup matters too
A smart automation setup becomes far more practical when paired with a backup power system during outages.
Example Automation Flow
Here is a real Node-RED flow that checks weather data and sends commands to smart devices:
Example Node-RED Automation Flow
This flow triggers on a schedule, fetches weather data via HTTP request, parses the JSON response, applies logic in a function node, routes through a switch, and sends commands to an Amazon Echo Hub.
System Architecture
Real-World Use Cases
Here are three practical scenarios where this automation system delivers real value:
1. Storm Preparation
When a weather API detects an incoming storm, Node-RED automatically charges your backup battery to full capacity, disconnects non-essential devices, and sends you an alert. All before the storm arrives.
2. Energy Cost Optimisation
With time-of-use pricing, electricity costs vary by hour. Node-RED schedules high-consumption activities (EV charging, water heating) during cheap periods and uses stored energy during expensive peaks.
3. Smart Load Control
During a power outage, the system automatically disconnects non-essential loads to preserve battery for critical devices like your refrigerator, router, and medical equipment.
Recommended Backup Power Options
If your automation flow is designed to respond to storms or outages, pairing it with a backup power system makes it far more useful.
Getting Started
Building this system is a project, not a purchase. Here is the path to get started:
- 1Choose a Node-RED host. Start with a Raspberry Pi or use Docker on existing hardware.
- 2Connect a weather API. OpenWeatherMap is free and provides forecasts and alerts.
- 3Integrate your smart hub. Connect Alexa, Homey, or Home Assistant via their APIs.
- 4Add compatible power devices. Smart plugs, backup batteries, or power stations.
Start with proven setups used in real homes.