Add a configurable energy limit for a charging session as an alternative to the target SoC percentage

[olithissen]

Is your feature request related to a problem? Please describe. My Hyundai IONIQ 5 is often unreachable via Bluelink due to firmware issues and very German cellular connectivity issues. In these cases the car is not recognized by evcc and the current SoC is not available. This also means no way to configure the charging limit.

Describe the solution you'd like I'd like to be able to configure an energy limit for the current charging session as an alternative to the target SoC percentage:

• Simple solution: Add an energy limit to a charging plan like a dropdown with steps of 5 kWh.
• Alternatively: As the battery capacity can already be configured for the vehicle, the actual energy could become part of the "progress bar": "80 % / 254 km / 46.6 kWh". Charging could alternatively be configured as differences like "charge additional 100 km", "charge additional 20%" or "charge additional 15 kWh".

Describe alternatives you've considered The WARP3 wallbox provides an energy limit that acts as a budget for the current session. When the energy limit is reached, the charging process stops. It works but requires to fall back to the WARP3 interface for configuration.

Additional context

[StefanSchoof]

Try to configure your car with the offline template https://docs.evcc.io/en/docs/devices/vehicles#offline

Then you should get a behavior similar to your idea.