/SmartEVSE-3

Smart Electric Vehicle Charging Station (EVSE)

Primary LanguageC++MIT LicenseMIT

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Note

This fork is exploring the capabilities in modifying the Smart-EVSEv3 firmware.
Feel free to use this repository to build it yourself or to use the latest on from the *releases* folder but this is on your own risk.

Changes in regards with the original firmware

  • New Status page using the Rest API
  • Disabled WebSockets
  • Reduced max backlight brightness
  • Home battery integration
  • Endpoint to send L1/2/3 data, this removed the need for a SensorBox
    • Note: Set MainsMeter to the new 'API' option in the config menu when sending L1/2/3
  • Callable API endpoints for easy integration (e.g. Home Assistant) - (See API Overview)
    • Change charging mode
    • Override charge current
    • Pass in current measurements (p1, battery, ...) - this eliminates having to use additionalhard
    • Switch between single- and three phase power (requires extra 2P relais on the 2nd output)

New Status Page

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Home Battery Integration

In a normal EVSE setup a sensorbox is used to read the P1 information to deduce if there is sufficient solar energy available. This however can give unwanted results when also using a home battery as this will result in one battery charging the other one.

For this purpose the settings endpoint allows you to pass through the battery current information:

  • A positive current means the battery is charging
  • A negative current means the battery is discharging

The EVSE will use the battery current to neutralize the impact of a home battery on the P1 information.
Regular updates from the consumer are required to keep this working as values cannot be older than 60 seconds.

Example

  • Home battery is charging at 2300W -> 10A
  • P1 has an export value of 230W -> -1A
  • EVSE will neutralize the battery and P1 will be "exporting" -11A

The sender has several options when sending the home battery current:

  • Send the current AS-IS -> EVSE current will be maximized
  • Only send when battery is discharging -> AS-IS operation but EVSE will not discharge the home battery
  • Reserve an amount of current for the home battery (e.g. 10A) -> Prioritize the home battery up to a specific limit

API Overview

View API https://swagger-ui.serkri.be/

Have an idea for the API? Edit it here https://swagger-editor.serkri.be/ and copy/paste it in a new issue with your request (https://github.com/serkri/SmartEVSE-3/issues)