The voltage level standard for household solar container is

Most residential solar panels on the market today operate within a standard voltage range of 12 to 24 volts. This range is ideal for residential applications, as it allows for compatibility with a wide array of devices and systems. [pdf]

Solar container cabinet protection level classification

Energy storage cabinets must achieve Class A fire resistance rating, maintaining structural integrity for at least 30 minutes when exposed to 1150℃ flames with surface temperatures not exceeding 180℃. [pdf]