There is no api or anything to communicate with the controller. But you can enter the system as root user with putty or ssh. To copy files from or to the controller use FileZilla or WinSCP.
To get history data you can copy the database /nvdata/DBFiles. This is a sqlite3 DB. Every 15 minutes it writes a new record. Because of the limited capacity old data will be deleted.
As a prerequisite for the following steps, the git repository should be cloned.
To save history data on a raspberry pi in a mariaDB and view it on grafana, use the folder copyDB_LG (mariaDB should have a username user with a password user ).
Actual data is Also accessible.
The processes running can be viewed with the command top. The communication with the serial ports in the different *Mgr processes can be sniffed with strace. (The strace comes from https://github.com/yunchih/static-binaries/blob/master/strace)
In the folder LG-ESS/root there are two files which should be copied to the LG-ESS.
The ip address must be edited in the bash script Both_Mgr.sh to the ip address of your raspberry pi!
To start sending to the raspberry, ssh into your LG-ESS
ssh root@lge-ems.local
nohup ./Both_Mgr.sh &
There will be Errors like nc: can't connect to remote host (192.168.xxx.xxx): Connection refused when the receiver isn't started!
Prepare the raspberry pi to receive.
Check if it works. Open a terminal.
sudo pip3 install paho-mqtt
cd LG-ESS-Gen1/server
sudo python3 LG-ESSapiSKmqtt.py
Open the browser and enter "localhost:9091/json/all"
There should be a list of data
If the server should start on every boot use:
sudo bash install.sh
there are three commands to get json data from the api
http://localhost:9091/json/all (use your ip address)
is a raw list of all data
pv
last_communication_time "2021-09-16T08:26:15.000Z"
pvValue6.Verbrauch 297
pvValue7 625
pvValue8.PV1Status 1
pvValue9.PV1V 344
pvValue10.PV1W 496
pvValue11.PV2Status 1
pvValue12.PV2V 351
pvValue13.PV2W 485
pvValue14 2364
pvValue15.Zähler 13995346
pvValue16.Frequenz 5001
pvValue17.AkkuV1 1985
pvValue18.entladen-laden 26
pvValue19.laden-entladen -519
pvValue22.Status 1
pvValue23.AkkuV2 1984
pvValue24.entladen-laden 25
pvValue26.soc 180
pvValue27.maxsoc 940
pvValue28 230
pvValue29 215
pvValue30.Zähler 44254
pvValue31.Zähler 42335
pvValue36 30
pvValue37 19
pvValue38 35
pvValue39 35
pvValue40 35
pvValue41 2
pvValue42 4
pvValue43 220
pvValue44 4
pvValue45.Zähler 152
grid
gridActiveImport 7982.14
gridActiveExport 7154.12
gridVoltage1 235
gridVoltage2 233
gridVoltage3 233.5
gridActivePower -0.26
gridFrequency 50.02
http://localhost:9091/lgess is a reduced list of the above dates.
grid
last_communication_time "2021-09-16T08:30:42.000Z"
GridActivePower 0.13
battery
PvSoc 16
PvBatPower -587
PvBatPowerInv 587
PvSocKW 960
load
GridActiveImport 7982.14
HousePowerConsumption 307
pv
GridActiveExport 7154.12
PvPower 999
http://localhost:9091/lgessgen1 is a reduced list of the above dates.
time "2022-02-10T09:34:30.000Z"
gridpower 42.74
gridimport 10666.26
gridexport 7193.78
gridvoltage1 234.6
gridvoltage2 233.9
gridvoltage3 233.7
batterysoc 21.5
batterypower 0
batterypowern 0
batterykwh 1290
residualpower 486.37
pvpower 439
A picture of the data captured from mqtt-explorer
advantage:
There is the source code folder (mqtt-src) with a readme
The compiled version for the LG-ESS and a bash script is in the (mqtt) folder. The ip address of the mqtt broker must be edited in the bash script Both_pipe2mqtt.sh!
This app should make LG-ESS Gen1 work with evcc or openWB mqtt interface. It is also useable to integrate LG-ESS in smarthome environments or node-red.
There is an example bash script which converts the modbus protocol into two json strings (test.sh).