Types of Batteries: The primary battery types for solar systems include Lead-Acid (cost-effective but shorter lifespan), Lithium-Ion (long lifespan and high energy efficiency), Nickel-Cadmium (durable but environmentally concerning), and Saltwater (emerging and eco-friendly). . A recent project in Spain used 12 container batteries (totaling 28. 8 MWh) to extend solar power availability by 7 hours daily. The system reduced diesel generator usage by 89%. One facility. . Which solar battery is the most cost-effective? When evaluating the most cost-effective solar battery, numerous factors come into play, such as the initial investment, efficiency, lifespan, and maintenance costs. There are different solutions to meet the varying requirements and needs of homeowners across the country. In this article, we'll explore some of the best home battery storage products on the market today and what to look for in a battery. . Adding an energy storage battery to a residential solar panel system typically costs $7,000 to $18,000. Some smaller batteries cost just a few hundred dollars, while premium systems can exceed $30,000.