Hi.
if it is 150 watts TOTAL power then you should use a 15 amp fuse.
(150w / 12v = 12.5amps, 15amp fuse should provide the correct protection.)
if the system is 150 watts PER CHANNEL. then it will be 300 watts total and a 30 amp fuse should be used.
(300w / 12v = 25 amps. 30amp fuse should be used.)
30 amp is normally the highest fuse recommended for an car audio system, so i would not use higher than this without taking the unit to a qualified auto electrician, to get the system checked for safety. if you have any further questions please feel free to ask.
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