What is the meaning of "P(U)" in my inverter settings?

PU Function (applicable to specific countries, please refer to local grid requirements). The PU function is a volt-watt response mode required by certain national standards such as AS4777.2. This function can control the active power of the inverter according to the grid voltage. Selecting "Enable" means that this function is turned on and is the default value. Select "Disable" to deactivate the function. This setting is usually used by grid company，so end user or installer usually don't need to change this setting.