Outdoor energy storage cabinets require materials that balance durability, cost, and environmental adaptability. This guide compares steel, aluminum, and composite materials – complete with industry data and real-world examples – to help you make informed decisions., has long specialized in delivering turnkey solar systems — including solar panels, inverters, and battery storage installations — to both commercial and residential clients. Keep all your PCE equipment and additional components in. The BBA-1 is a compact, outdoor-rated enclosure for a single battery (or two U1 packs). Built from aluminum or stainless steel with NEMA 3R/4/4X options, it's ideal for pole, tower, or wall applications where secure, weather-tight storage is required.