For your requirement to add another camera to the existing system, which must be mounted under a roof overhang and therefore has no direct access to sunlight, there are a few points to consider:

## Compatibility
The additional camera must be compatible with the existing HomeBase 3 system. The "S330 eufyCam 3 Additional Security Camera" (T81603W1) is already compatible with the HomeBase 3, which enables cross-camera tracking.

## Solar panel solution
As the camera must be mounted under a roof overhang and therefore has no direct access to sunlight, you can use a separate solar panel that is connected to the camera via a cable. Eufy offers official solar panels that have been specially developed for these cameras. Make sure that the solar panel contains the correct adapters to connect it to the camera. It is advisable to enquire directly with Eufy to ensure that the solar panel is compatible and contains the necessary adapters.

## Summary
- Use the "S330 eufyCam 3 Additional Security Camera" (T81603W1) for compatibility with your existing system.
- Obtain a separate, official Eufy solar panel that can be connected to the camera via a cable to ensure the power supply.

This ensures that the cross-camera tracking also works with the new camera and that the power supply is guaranteed despite the shade.