The pressure relief structure acts like a "controlled burp" mechanism, releasing gases while maintaining cabinet integrity. Suitable for indoor and outdoor wall mount1 with NEMA 3R rating. The PWRcell 2 Battery Cabinet is one component of the PWRcell 2 Home Energy Storage System. 1Optional floor support with. KDM solar battery cabinets provide you with the ultimate outdoor dust-tight, watertight, and weatherproof solution for your solar batteries. Research shows that good battery storage lowers the chance of damage or fires. The commerical and industrial (C & I) system integrates core parts such as the battery units, PCS, fire extinguishing system. Most industrial off-grid solar power sytems, such as those used in the oil & gas patch and in traffic control systems, use a battery or multiple batteries that need a place to live, sheltered from the elements and kept dry and secure.