Which type of battery is commonly used in solar power systems?

In solar power systems, lead-acid batteries are commonly used due to their established performance, availability, and cost-effectiveness. These batteries have been around for a long time and are reliable for storing energy produced by solar panels. They can handle the charge and discharge cycles effectively, making them suitable for solar energy applications where cycles can be frequent.

Lead-acid batteries also have a robust tolerance for deep discharges, although it's generally recommended to keep them above a certain discharge threshold to maximize their lifespan. They come in various types, such as flooded and sealed versions, catering to different installation scenarios.

While lithium-ion batteries offer advantages like higher energy densities and longer lifespans, they are often more expensive, which can be a barrier for some users. Nickel-cadmium and alkaline batteries, although used in specific situations, are not typically the go-to choices for solar power storage in residential or commercial systems due to factors like cost, toxicity, and less favorable performance parameters compared to lead-acid options.