"自备供电设备" can be translated into English as "self-provided power supply equipment" or "self-contained power generation facilities", depending on the specific context and emphasis.
"Self-provided power supply equipment" emphasizes that the equipment is provided or owned by the user themselves for supplying power.
"Self-contained power generation facilities" focuses more on the facilities being independent and capable of generating power on their own.
In most cases, "self-provided power supply equipment" would be a more straightforward and commonly used translation.