What type of batteries are best for a solar panel system?
All the lead acid battery types are used, such as flooded, AGM, and Gel, and sometimes other chemistries (like nicad) in specialty applications. Cost per amp hour, the flooded (wet) batteries are hard to beat, but require routine maintenance, which if neglected can cost more than the initial savings. The sealed AGM and Gel batteries are more expensive, but reduce maintenance and internal discharge factors. Most controllers will deal with flooded and AGM batteries, but some are not suitable for Gel batteries, as they require a different charge voltage, which if exceeded, will damage the batteries. As for longevity, quality batteries properly maintained will give roughly equal life among the three types.
