- eMH1 11kW ( old version) --> Power calculation with internal current values
- eMH1 11kW ( > Q2-2021 no internal current sensor) --> 'virtual' Power calculation
- eMH1 22kW --> Power calculation with internal current values
- eMH2 22kW (StandAlone Modus) --> Power calculation with internal current values
- INDEX-Page: display wallbox-status and actual parameter (I-max, kw-charge, kW/h, charging-time)
- SET-Current: "Quick-set" predefined Ipwm values to ABL-Box
- CONFIG-DATA: set and store parameter and WiFi-credentials and the the "Quick-Set" charge-current
- EVENT-LOG: Serial debug logging
- UPDATE: over-the-air (Wifi) Software update
- HISTORY: Set and Store total kW/h sum in internal FLASH
- INFO: Version, Build, Temp(ESP-intern), IP, Timeout, Charge-Cnt, RSSI
Monitor and control your ABL-Wallbox with an WEB-Application and integrate it (optional) in your homeautomation software with simple REST-Interface (see example for DOMOTICZ below) for less than 10€.
For (new) ABL-Boxes without internal per phase current sensor, the current could "pre-measured" external and defined in the APP-configuration per Imax setting. So it is possible to have a "poor man's" power and consumption measurement. If you charge every time the same car, the typical power for a defined Ipwm is near to the real measurement with a current-sensor, but with current sensor there is also an error, because the voltage 'U' for power calulation (P=U*(I1+I2+I2) is not measured.
I get the power from my "offical" smartmeter and set them into the config-file.
If the Box has a current-sensor it was automatic detected and the value is calculated based on the current sum of the 3-phases...For future versions it would be possible to expand the software to get the power or current over the WEB-API from an external meter.
The user interface was designed very simply to enable manual switching between two charging currents (possible application: ABL-Wallbox-kWh Gesamt ABL-Wallbox-kWh Gesamtreduced charging current for operation with a PV system). The two values could be individual defined in the 'config-data' page (for external setting use the WEB-API)
With the WEB-API the state and consumption values of the Wallbox could be monitored and charge-current could be set from 6A up to 16A in external applications like homeautomation software.
http:<your-ip>/fetch
Receive:
8.00,0.00,A1,0.00,103980,00:00:00
decoded:
<Imax [A]>,<aktual Power [kW]>,<Status>,<aktual Work [kW/h]>,<Sum Work [W/h]>,<charge-time>
http:<your-ip>/fetch?imax=xx (xx= 6,8,10,12,14,16)
...see above 'WEB-API' for other external integration (e.g. other homeautomation software)
add to configuration.yaml:
rest:
scan_interval: 20
resource: http://192.168.2.108/fetch
sensor:
- name: "ABL-Wallbox Imax"
unique_id : "sensor_abl_imax"
icon: "mdi:ev-station"
value_template: '{{value.split(",")[0]}}'
unit_of_measurement: "A"
device_class: current
- name: "ABL-Wallbox kw"
unique_id : "sensor_abl_kw"
icon: "mdi:ev-station"
value_template: '{{value.split(",")[1]}}'
unit_of_measurement: "kW"
device_class: power
- name: "ABL-Wallbox-Status"
unique_id : "sensor_abl_status"
icon: "mdi:ev-station"
value_template: '{{value.split(",")[2]}}'
- name: "ABL-Wallbox-kWh akt."
unique_id : "sensor_abl_kwhakt"
icon: "mdi:ev-station"
value_template: '{{float(value.split(",")[3])/1000}}'
unit_of_measurement: kWh
device_class: energy
- name: "ABL-Wallbox-kWh Gesamt"
unique_id : "sensor_abl_kwhsum"
icon: "mdi:ev-station"
value_template: '{{float(value.split(",")[4])/1000}}'
unit_of_measurement: kWh
device_class: energy
state_class: total
rest_command:
abl_set_imax_6a:
url: "http://192.168.2.108/fetch?imax=6"
method: GET
abl_set_imax_16a:
url: "http://192.168.2.108/fetch?imax=16"
method: GET...see above 'WEB-API' for other external integration (e.g. other homeautomation software)
LUA polling script for Domoticz (ablpoller.lua)
-- Polling of ABL-Web-App
--
-- This function split a string according to a defined separator
-- Entries are returned into an associative array with key values 1,2,3,4,5,6...
local function split(str, sep)
if sep == nil then
sep = "%s"
end
local t={} ; i=1
local regex = string.format("([^%s]+)", sep)
for str in str:gmatch(regex) do
t[i] = str
i = i + 1
end
return t
end
-- Retrieve the request content
s = request['content'];
print("ABL-Wallbox-Poller:"..s);
-- Split the content into an array of values
local values = split(s, ",");
-- Update devices
-- ACHTUNG: Index beginnt in LUA mit 1
-- xx mit aktueller IDX anpassen
-- vv
domoticz_updateDevice(63,'',values[1]) -- Imax
domoticz_updateDevice(65,'',tonumber(values[2])*1000) -- Watt !!
domoticz_updateDevice(62,'ABL-Status',values[3]) -- Status-String
domoticz_updateDevice(66,'',values[4]) -- kW/h
domoticz_updateDevice(67,'',values[5]) -- W/h SUMThis example is realised with an 'ESP32-S2 mini' board and an 'MAX485 TTL to RS485' Converter. The Olimex ESP32-POE has integrated Ethernet, supports Power over Ethernet and has a 5V/GND output for powering the "MAX485 TTL to RS485" Converter. You need to build the ESP firmware by yourself with platformIO. Have a look at the platformio.ini and adjust as you need it. Additionally, have a look a the GPIO PINs as specified here: https://www.olimex.com/Products/IoT/ESP32/ESP32-POE/resources/ESP32-POE-GPIO.png ...but any other ESP-Board could be used with small modifications in the code and platformio.ini.
(board is cut to fit in a DIN hat rail case)
my shared investigations and notes: my-doc
...others sources https://github.com/ThKls/Wallbox-Test
https://www.goingelectric.de/forum/viewtopic.php?f=34&t=38749&start=60
https://www.goingelectric.de/forum/viewtopic.php?p=1550459#
connect RS485 to Pin1 (=A) and Pin2 (=B) of left RJ45-Connector in Wallbox
the termination Jumper may be optional (worked for me with and without)
...more infos:
evcc-io/evcc#2801
Licensed under the European Union Public License (EUPL)-1.2-or-later
Why licensed under EUPL-1.2: it is compatible to GPL and compatible to EU-rights and regulations
- To download click the DOWNLOAD ZIP button, rename the uncompressed folder 'ESP32_ABL' ...or clone it with git
Projekt was build and testet with PlatformIO.
Take care to upload the 'data' folder to the SPIFFS filesystem see: https://randomnerdtutorials.com/esp32-vs-code-platformio-spiffs/
With the following two command you can create and upload the SPIFFS image:
pio run --target buildfs
pio run --target uploadfs
If you do not want to compile the program from source:
for the ESP32-S2 mini board I supply the actual firmware-version
-
got to subfolder
firmware/lolin_s2_mini/V1_2 -
put ESP32-S2 board to flash-mode:
-
disconnect USB then press and hold "0"-button
-
reconnect USB hold "0"-button
-
then release "0"-button --> now the board is in program-mode
-
run
flash.sh(for Linux) orflash.bat(for Windows) (needs 'esptool.py') --> ask google -
after flashing reset or disconnect USB
-
search WIFI connetions for "ABLWALLBOX"
-
connect (without password)
-
start your webbrowser at "192.168.4.1" (this is the startpage for the APP) to connect to your home-route navigate to "Setup" --> "Config-Data" and change:
varWIFI_s_Mode=STA;
varWIFI_s_Password=mypassword;
varWIFI_s_SSID=myrouter;
V1.0 initial version, first test with real charging car (VW ID.3)
V1.1 ABL-Box without internal current-sensor: calculate power and consumption from premeasured config-values.
V 1.2 index-page redesign, fixes for kW/h-calculation, fetch kW/h sum, Info-page, display chargetime, bugfixes.
V1.2.2 Bugfix for 'virtual kW/h-calculation' and Modbus timeouts
- MQTT-client
- get actual Power [kW] and Work [kW/h] from external meter
- get actual current from current sensor and calulate Power and Work
- store more history data (last charging data)
- get history-time from ntp (could work only in 'STA' network mode)
