I just installed my new EVCS (standalone) according to manual and updated to the latest firmware level (EVCS_Main_FW_OTA_V02.03_C025) and then plugged in my new car (Citroen eC3) for charging. I started carefully at 6A (with 3-phase power) since my cabling is not the final one. The strange thing is that the EVCS screen shows about 5,1 kW (which I expected), but TIBBER shows roughly 4,5 kW for the whole house (which I have to pay for). Looks like I am getting about 0,75 kW out of thin air … what could be the problem ?
My EVCS is completely standalone (the GX and all the other stuff is yet to come when I install the panels). In the settings I have kept the EV charger position at Inverter AC OUT (with no inverter there) and kept the GX device settings at the default with “Communication disabled”.
What is wrong here ? One of the measurements in the EVCS seems higher than in reality if I assume that my official power meter and the Tibber display are correct ?
… looks like that this is a power calibration issue … need to find some science behind just applying/changing some factors
same issue i am encountering and i am with 2.08 firmware..not a priority to correct the issues after the sale of the device…unfortunately..
The power factor can be adjusted in the settings of the EVCS.
Some cars have a terrible power factor at low power.
The current solution does not work because the efficiency changes depending on the charging current.
- At 6A: The correction factor needs to be 0.86
- At 16A: The correction factor needs to be 0.95
Using a single, fixed correction factor breaks the entire automation concept.
The impact on your system:
The goal of the system is to dynamically adjust the EV charging speed based on available solar (PV) power and household consumption.
- Weather changes: On a sunny day with passing clouds, the system needs to lower the charging power when a cloud blocks the sun.
- Household loads: When heavy appliances turn on inside the house, the system needs to reduce the EV charging power so you don’t pull expensive energy from the grid, forcing the house to use battery power instead.
Because the efficiency factor drops significantly at lower amps, the math becomes incorrect whenever the system tries to scale down the power. This completely ruins the dynamic balancing act.
Car is MB EQA and i am charging with a static of 11A 3P so not a low power.
i will try to have a look over Home assistant and EVCC integration
LE: Minutes after my post, i just pressed again the firmware check button and suddenly shows 2.09 available which brings a potential fix for this issue → calibration table. I will try it asap.
I can confirm that the 2.09 fw fixes this issue. The reporting of the car chagring power is quite accurate.
thank you for fixing this.
If I remember correctly you can also configure a power factor table with different values for different currents.
