Which is not a routine maintenance item of the ECC800 power module?

When the device interface uses the Modbus-RTU protocol, what needs to be installed when accessing the ECC800?

The rated capacity of the battery: also called the nominal capacity, according to the national standard or line standard requirements, is the lowest capacity value that should be released.

The PDU8000 intelligent power meter parameter display is abnormal, which may be caused by (). (Multiple choice)

In the naming of UPS5000-E-120K-HASBS, the letter E stands for ().