What is the primary advantage of using a grid-tied battery-backup system?

The primary advantage of using a grid-tied battery-backup system is that it ensures a continuous power supply in conjunction with the utility grid, especially during power outages. In this setup, solar panels generate electricity, and the battery storage allows for the retention of excess energy produced during the day. When the grid is down, the system can draw power from the batteries to provide electricity to the home or business.

This capability is particularly valuable because it combines the benefits of both grid-tied solar systems and battery backup. The system can operate normally while connected to the grid and seamlessly switch to battery power when necessary. This functionality protects homeowners from outages and fluctuating energy prices, allowing them to maintain a reliable power source, which enhances energy security.

In contrast, options mentioning that it can only operate with batteries, provides power independent of the utility, or minimizes battery costs do not accurately reflect the primary strengths of such systems. While battery backup systems interact with batteries, their main feature is their ability to create a reliable and continuous power supply from both the stored energy and the utility grid.