EaseeSolarCharge

A Home Assistant and Node-RED based flow to dynamically control Easee EV charge current based on solar production, including automatic change between 1 or 2/3 phase charging, working from 1,4kW to >10kW

Description

This node-red flow allong with a few requisites outlined below will allow you to control the dynamic charge current on your Easee EV Charger based on current solar production. The flow supports 2 or 3 phased charging, where the two-phased is maximizing the charge current, assuming that you have an summarazing electricity-meter, where you can export on one phase and import on the other two phases equalling each other.

Prerequisites

• The flow is intended for European grid with 3-phase 230v/400v installations and 3-phase Easee EV charger
• You need a solar-array, preferably with a 3 phase inverter.
• You need a Home Assistant, with the Easee Integration installed.
• You need live-data for the solar production (in watts) in Home Assistant (preferably data updating every 5-10 seconds) The flow is designed for a solar array with a max capacity of 7500w, feel free to extend the switch-nodes to higher wattage if your array is larger, or reduce the number of switch points if your array is smaller.
• You need to create two Boolean helpers in Home Assistant (one for activation of SolarCharge, and one for switching between 2 or 3 phased cars):
  • input_boolean.solarcharging (Put this helper in a Lovelace dashboard to be able to switch the flow on or off)
  • input_boolean.3phasecharging (Put this helper in a Lovelace dashboard to be able to switch between 3 and 2 phase charging (on=3-phase, off=2-phase))
• You need to create a sensor for creating 2minute average production values (in watts) (correct code to your own scenario):

sensor: 
 - platform: filter
   name: Inverter 2min Average Production
   entity_id: sensor.inverter_grid_active_power
   filters:
     - filter: time_simple_moving_average
       window_size: "00:02"

• Feel free to delete the bottom part of the flow that auto enable/disable Solar Charging at sunset/sunrise. That does not impact the function of the main flow.

Installation

• Read the Prerequisites chapter and create the sensors and helpers.

• Grab the .json file in this repository and import it to Node-RED

• Adjust nodes to your entities etc.

• Be sure to enter your Easee charger-id in the four "Charger ID" change nodes:

• Change the switch nodes to your likings. Currently the flow pauses charging of the solar production goes below 500w:

• Be sure to fill out your location details in the big timer node:

• Please adjust the "auto enable/disable Solar-Charging at sunrise/sunset" flow to your likings, depending on which behaviour you prefer.

• Et voila! You should be good to go, if everything is done right. Please feel free to give me feedback or contribute if you find errors or bugs.

Warning

• Please refer to Easee Developer Platform for more information about the API
• Please only set/change dynamic values, as it stays in the memory of the charger.
• Setting/changing non dynamic values will wear out the flash of the charger according to Easee