The RAYLITE M-SOLAR Batteries are designed specifically for large capacity, stationary, solar applications. These batteries are of the highest quality, and are a flooded wet cell configuration. They can be connected in series to make up 12, 24, 48, or what ever your voltage requirements of your stationary battery bank necessitate. They come with many features, such as Float Level Indicators, (so you can see at a glance the electrolyte level, without removing the cap). Perfect Seal Bolt-On Connectors, Stainless Steel Bolts, Injection Moulded Connector Heads, Threaded Brass Inserts, High Quality Sleeve Separators and internal Mud Traps (prevents possible shorting between plates due to active material shedding during cell life), and many more.