its not the power given that blows them, only the power drawn..... if you have a 25 amp current draw on your lights, and you use anything less than a 30 amp fuse (25 if you can find one), the fuses will blow becuase they cant handle the power demand.... most auto stuff requires 12v current, the amp draw is what you need to focus on.... go with the hard wire to the battery, id do a 30 amp inline fuse, or if you are an audio guy, you should probably have a 50amp inline or fused distribution block... either will work... but id definately do a fuse within the first 3 feet from the battery at least a 30 amp..... dont hide all your wires right now, make your basic connections and once hooked up, flip your lights on for a minute, then off for a minute, then back on... if the fuse doesnt blow, go hide your wiring... if it does.. trace the wiring down for a pinched one, or a cracked one... if bare wire is touching metal, and its not meant as a ground wire, ur gunna keep blowing... whos the manufacturer of that light kit by the way?