I have a brand new (Chinese) electric bicycle that melts (rather than blows) the 30 amp spade fuse every time I use it. Voltage is 36v andthe motor is 180 watts. A 40amp fuse is available by special order but I am reluctant to use one without specialist advice. Just to clarify; the spade fuse is the standard one used on 12v automotive systems. Any thoughts would be appreciated.