Energymeter

This node calculates energy based on power inputs. No need to measure time seperately.

As you may use one or more appliance in your home automation which are able to output power measurement you may want to know the energy consumption/production over a specific period of time. This node takes power values as input parameter and calculates the energy amount. As energy can be discribed as the product of power and a time period, the time period this node uses is the intervall between two inputs.

Highlights

• → calculate energy from simple power input
• → persistance storage
• → various setter functions

[!IMPORTANT] Make sure write access is granted when using file storage.

Changelog

• see on github: changelog

Installation

In Node-RED (preferred)

• Via Manage Palette -> Search for "node-red-contrib-simple-energymeter"

In a shell

Basic installation:

• go to the Node-RED "userDir" folder, typically ~/.node-red
• run npm install node-red-contrib-simple-energymeter

Usage

Simply wire it to a power input device and make use of the output:

Fig. 1: Basic usage node energymeter

Properties

New: add filepath for persistence storage, so data won't be lost on restart

For example: /home/youruser/.node-red/energymeter_1.json

Fig. 2: Properties node energymeter

Status, set & reset

[!NOTE] Options are available for: daily, weekly, monthly, yearly

Send a ...

• msg.payload = "status" to retrieve current data

• msg.payload = "resetDaily" to reset daily energy value

• ...

• msg.payload = "resetYearly" to reset yearly energy value

• msg.payload= {"set":{"daily":100}} to set a daily energy value

• ...

• msg.payload= {"set":{"yearly":100}} to set a yearly energy value