Load Shedding with Webhooks
- Michael Salerno
- Douglas Roberson
Load shedding is the intentional, temporary reduction of electrical power supply to certain appliances and/or circuits. This is done to reduce electrical consumption and is a cost saving measure. Load shedding helps to balance supply and demand, ensuring the stability of the overall electrical system during times of high demand or when there are issues with power generation.
Load Shedding with Webhooks:
Using webhooks with the Shelly Pro 3EM and various other Shelly relays to accomplish load shedding involves creating a system where you can dynamically control and shed loads based on certain conditions, such as high energy consumption or demand.
Prerequisites
Shelly EM Devices
These devices will be used to gather the consumption data required for load shedding
Steps to Setting up Load Shedding using Webhooks
1. Setting Up Shelly Pro 3EM
Wire and Configure the Pro 3EM
Install and Configure: Install the Pro 3EM per the diagram below to monitor the energy consumption of the entire home.
In scenarios where CT-B is not used, it is advised to repurpose it to cover Neutral. This requires recalibrating in the device’s settings.
Legend
Terminals | Cables | ||
|---|---|---|---|
A | Phase A input | LA | Phase A live (110-240 V) cable |
B | Phase B input | LB | Phase B live (110-240 V) cable |
C | Phase C and power supply input | LC | Phase C live (110-240 V) cable |
N | Neutral terminal | L | Mono-phase live (110-240 V) cable |
IA | Phase A current transformer input | N | Neutral cable |
IB | Phase B current transformer input | Current transformers | |
IC | Phase C current transformer input | CTA | Phase A current transformer |
IN | Neutral current transformer input | CTB | Phase B current transformer |
|
| CTC | Phase C current transformer |
|
| CTN | Neutral current transformer |
Connect to Network: Using Shelly Smart Control, connect the Pro 3EM to your network.
Shelly Cloud (optional): Add Shelly Pro 3EM to a Shelly Cloud account for remote access.
2. Set Up Additional Shelly Relays
Install Shelly Relays: Install Shelly relays to control the specific loads you want to manage.
Connect to Network: Using Shelly Smart Control, connect the Pro 3EM to your network.
Shelly Cloud (optional): Add Shelly Pro 3EM to a Shelly Cloud account for remote access.
3. Create Load Shedding Logic
Define Thresholds: Decide the energy consumption thresholds at which you want to shed loads.
Configure Actions:
In the Shelly Cloud app, create actions based on the consumption thresholds.
For each threshold, set up a webhook to trigger the corresponding Shelly relay.
4. Implement Webhooks
Identify Webhook URLs: Each Shelly relay will have a unique URL for triggering actions. These URLs start with the Device IP Address which can be found in Device Settings
Configure Shelly Pro 3EM:
In the Shelly Pro 3EM settings, go to the "Actions" section.
Set up actions to send HTTP requests (webhooks) when the energy consumption crosses the defined thresholds.
5. System Testing
Simulate High Load: Increase the load to trigger the thresholds.
Verify Actions: Check if the webhooks are triggered and if the relays respond accordingly by shedding the loads.
Example Configuration
Webhook to Turn Off Load:
URL: http://192.168.33.1/relay/0?turn-off
Method: GET
Shelly Pro 3EM Action:
Condition: Energy Consumption > 5000W
Action: Send GET request to
http://192.168.1.50/relay/0?turn=off
By following these steps, you can effectively use webhooks with Shelly Pro 3EM and various Shelly relays to implement load shedding, helping to manage and reduce energy consumption dynamically.