How to Build a DIY Solar Battery Rack: A Step-by-Step Guide? A DIY solar battery rack secures and organizes batteries in solar setups. Use materials like angle iron or plywood, ensure proper ventilation, and follow safety protocols. Costs range from $50–$300. With the rising popularity of renewable energy, building a solar battery box can be a game-changer for your home. Imagine harnessing the sun's power and keeping your devices charged even when the sun isn't shining. Add foam insulation and an optional door to keep them toasty in the colder months, giving you the best performance from your energy storage. It serves as a protective enclosure for solar batteries, safeguarding them from various environmental factors such as dust, moisture, and physical damage. Mounting Mechanism for Battery Cabinet 3.