Final answer:
Before installing residential solar panels in Los Angeles, consider the system configuration, solar potential, and sizing and cost of the installation.
Step-by-step explanation:
Before opting for residential solar panel installation in Los Angeles, there are several factors to consider. Firstly, you need to determine the configuration of the system, whether it should have local storage or be tied to the regional electrical grid. Most solar installations in the U.S. are grid-tied, as batteries can significantly increase the cost of the system. Secondly, it's important to consider the solar potential in Los Angeles, which can be determined based on factors such as panel orientation and tilt. Lastly, you should also think about the sizing and cost of the installation to ensure it meets your electricity consumption needs.