The container or building should be at least 15 meters from other structures. If placed over 30 meters away, no fire compartmentalization is required. Second-life batteries are not allowed. For battery systems up to 25 kWh, placement in a separate room within an existing building is permitted if. . Must be at least 3 feet apart from each other and any windows, doors, or gas meters. That means, for one battery system, you must have 9 feet of total working space. Should be installed within 20 feet of the electrical meter. . sted to UL 9540. According to UL 9540 the separation between batteries should e 3ft (91. UL 9540 also provides that equipment evaluated to UL 9540A with a written report from a nationally recognized testing laboratory (NRTL), such as ETL, can be permitted to be installed with less than 3ft. . Enphase IQ Battery 3, 3T, 10, and 10T test was conducted at the manufacturers recommended mounting distances with a minimum of 6” between vertically stacked units, 1” horizontally between IQ Battery 3/3T, and 6” clearance on the sides for IQ Battery 10/10T. The IQ Battery datasheets detail that. . NFPA 855 sets the rules in residential settings for each energy storage unit—how many kWh you can have per unit and the spacing requirements between those units. First, let's start with the language, and then we'll explain what this means. In Section 15. 5 of NFPA 855, we learn that individual ESS. . If batteries are being installed inside a home, they must be protected by a utility closet, which must have a minimum of 5/8″ gypsum board on the walls and ceiling.