Battery efficiency

[WeiAi-Energy]

Checklist

• I am using the current master branch
• I am running on an up-to-date pypsa-usa environment. Update via conda env update -f envs/environment.yaml

The Issue

In add_electricity.py, the efficiency of batteries is assumed to be 0.9, but according to NREL ATB 2024, it should be 0.85. I am not sure whether this is intended or a mistake.

717. efficiency_store=0.9**0.5,
718. efficiency_dispatch=0.9**0.5,

Steps To Reproduce

No response

Expected Behavior

No response

Error Message

Anything else?

No response

[ktehranchi]

Thanks for catching. Feel free to change this and submit a PR. This should only impact existing storage units.