ValueError: invalid literal for int() with base 16: '\x0e\xa3' Python

I get bytes from the serial port which represents the voltage on my PIC board. But I can't convert these bytes(strings) to decimal because I get the error message above. Here is the function(in fact, it's associated with tkinter button)

def channel8():
    ser.write(chr(0xFF))
    print "you have select channel8"
    x=ser.read(2)
    w=int(x, 16)
    print w
    print "Voltage on channel8 is:" , x

ValueError: invalid literal for int() with base 16: '\x0e\xa3'

def channel8():
    ser.write(chr(0xFF))
    print "you have select channel8"
    x=ser.read(2)
    z=struct.unpack("h", x)
    #w=int(z, 16)
    print z

and i get this :

Voltage on channel8 is: (28942,)

can you please explain how did i get this value? it's not matching anything :D