The SunWize Power & Battery C4-500 aluminum enclosure features a mill-finish and a NEMA3R rating for indoor or outdoor use. The C4-500 enclosure can mount on a flat vertical surface or on a variety of pole sizes. It also features a pad-lock hasp to securely lock the enclosure with your own lock. The C4-500 enclosure can hold a variety of battery sizes with plenty of space left over for controls equipment on its back and side plates. The rear-mounted backplate measures 15” x 6.5” and the side mounted backplate measures 8.75” x 3.75”. There are seven 1/2” knockouts available, three on the back and four on the bottom, for wiring purposes.