Charge car with pv - Fronius + go-e running on Pimoroni Badger 2040 W
PV-Überschussladen mit Fronius + go-e charger auf einem Pimoroni Badger 2040 W
This runs on the Badger 2040 W and monitors the grid power. If you have enough pv surplus and the car is connected to the charger, it starts charging. Only excess power is used, grid usage is avoided. The go-e charger settings are respected, e.g. schedule and power limits. On the e-paper you see the current status. Automatic start and stop and phase change depending on available excess pv power is supported. This is tested with a Fronius Symo inverter, go-e charger HOME V3 and Stellantis EV platform (Citroen).
All runs in the local network which allows a fast update cycle to track clouds. More inverters can be supported if someone helps with getting the current grid power and testing.
There is no handling of a battery storage. As only the grid consumption is monitored, this will not compete with a battery controller as only excess power to the grid is used for charging.
Note: Wallbox power is smaller than available pv as the car is almost full and limits the charging.
- Fronius inverter with datamanager (Symo, Gen 24, etc.)
- go-e charger (HOME with V3 hardware for phase change, Gemini)
- Pimoroni Badger 2040 W
- Electric vehicle
After initial setup, pv charging is mostly automatic.
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In the go-e app under settings you need to make sure charging in allowed in the scheduler and define a kWh limit if you want to only charge to a certain level.
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Set charge mode to standard (no ECO or next trip mode)
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Plug Badger 2040 W on a power supply, USB or on batteries to run.
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Information is shown on the display
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When data is retrived and the logic cycle is running, the LED in on.
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Keep
UPorDOWNbutton pressed during cycle (LED on) to change charge limit (+/- 2.5 kWh). -
To stop unplug from power supply as the program will always run.
If you want to charge when there is not enough pv power (e.g. during the night) or charge with full power, you have 2 options. Otherwise it will always stop the charging.
- Stop the program by cutting the power supply.
- Use the next trip mode. (Currently behaviour not fully tested)
- Get latest firmware Github Badger 2040 W
- Install using instructions
- Download / install Thonny IDE
- Connect to Badger 2040 W via USB, see Pimoroni geeting started
- Download latest release
- Modify configuration, see section below
config.py
- Upoad files on Badger 2040 W
config.pysunflower.pyasync_urequests.pymodified async_urequests is included in release
Current in micropython included requests modules miss handling all cases needed. The modified library fixes some server handling to make it work. (SSL seems to be broken, but not used here.)
- Edit files on Badger 2040 W, see below
WIFI_CONFIG.pymain.py
- Reboot
TIMEZONE - Default value: 1 (Central European Time (CET))
Number of hours difference between UTC (positive or negative number)
DST - Default value: True
If True, enable automatic DST time setting. False: No DST correction used.
NTP_HOST - Default value: "1.europe.pool.ntp.org"
Hostname for NTP time server
IP_PV - Default value: "xxx.xxx.xxx.xxx"
IP or hostname pv inverter Fronius, change to your your configuration
IP_WB - Default value: "xxx.xxx.xxx.xxx"
IP or hostname go-e charger, change to your configuration
CAR_BAT_SIZE - Default value: 50
Car battery maximum capacity in kWh, used for percentage calculation charge status and limit
I_MIN - Default value: 6
Minimum charging current for car in ampere (usually 6 A)
I_MAX - Default value: 16
Maximum charging current allowed, electric installation and charger type. 16 A is for 11 kW charger.
I_MAX_1P - Default value: 16
Maximum current limit for 1 phase, set to country limit if less than I_MAX
WB_METERED - Default value: True
True if the wallbox power is included in the grid meter power value. Depends on meter wiring in electric setup.
CYCLE - Default value: 6
Seconds to wait between cycles while charging (how close to follow the power generation)
WAIT - Default value: 60
Seconds to wait if there is no pv power or no car connected
WAIT_PHASE_CHANGE - Default value: 15
Seconds to wait after phase change: May be removed if future
SHORT_CYCLES - Default value: 6
Number of program cycles to use for average calculation of short period grid power: Equals 36 s with default 6 s CYCLE
LONG_CYCLES - Default value: 20
Number of program cycles to use for average calculation of long period grid power: Equals 120 s with default 6 s CYCLE
SCREEN_REFRESH - Default value: 120
Seconds to wait between badger screen updates (not used for status updates e.g. phase change), checked only on each cycle, so no exact timing
Power values defined below are negative for excess pv and positive for grid consumption
P_MIN_1P - Default value: -1440
Minimum power in W for 1p charging ampere calculation (I_MIN x U max), no need to change
P_MIN_3P - Default value: -4320
Minimum power in W for 3p charging ampere calculation (I_MIN x U max), no need to change
SWITCH_3P - Default value: -4200
Power threshold in W to switch for 3 phase charging
SWITCH_1P - Default value: -3800
Power threshold in W to switch for 1 phase charging
SWITCH_ON - Default value: -1300
Power threshold in W to start charging when average of LONG_CYCLES is below (more power available)
SWITCH_OFF - Default value: -900
Power threshold in W to stop charging when average of LONG_CYCLE is above (less power available), default allows up to 400 W grid consumption.
SSID : Your WLAN network SSID, must be visible, case sensitive
PSK : Your WLAN password, case sensitive
COUNTRY : 2 character country code for WLAN band selection, required
Run sunflower program at startup. As sometimes the program does stop unintendedly, the watchdog timer will restart. The program must therefore be the one to start and not the badgerOS launcher.
Replace default launcher import with the following line.
import sunflower