For what feels like forever, lead-acid batteries have been the winning choice for off-grid solar systems. With the growth of electric vehicles and portable energy storage solutions, lithium-ion battery technology has improved vastly and become the top option for off-grid solar.
In 2016, lithium-ion batteries were just beginning to be used for large-scale solar systems, but they have been used for portable and handheld solar systems for years. Due to their enhanced energy density and ease of transport as well as smaller size and reduced weight, you need to look at using lithium-ion batteries when planning a portable solar energy system.
Read full article: USA Today