"极限输出功率" can be translated into English as "maximum output power" or "peak output power".
"Maximum output power" emphasizes the highest possible power output under normal or specified operating conditions.
"Peak output power" often refers to the instantaneous or short-term highest power output, which might be higher than the sustained maximum due to temporary overloading capabilities in some systems.
In most contexts, especially when referring to the sustained capability of a device or system, "maximum output power" would be the more appropriate choice.