Learn the differences and advantages of three types of solar power systems: grid-tie, off-grid, and backup. Compare the costs, benefits, and challenges of each system and find out which one suits your needs. Grid-tie solar is, by far, the most cost-effective way to go solar. Because batteries are the most expensive component of any solar system, but grid-tie solar owners can. Off-grid solar is best for delivering power to remote locations where there is no access to a utility line. Folks who live off the grid are solely responsible for generating their own. If you live on the grid, but you want protection from power outages, your best bet is a battery backup system. Backup power systems connect to the grid, and function like a normal grid-tie system on a day-to-day basis. However, they also feature a backup.