#11831, "RE: Inline fuse size for a 150watt inverter" In response to In response to 11
Originally posted by Star Turbo Talon Do not use a 20amp fuse on the power wire when the Inverter has a 20amp fuse built in...this is pure stupidity. Think fuse coordination, 20amp in the unit, logic calls for a larger fuse upstream. Go with a 25amp under the hood. This way the fuse under the hood protects your cable and the fuse in the unit protects the load on the inverter. 40 or 50 amp fuse is not smart either. IF you fuse both of them the same, what do you think will happen if you exceed the current draw? Both fuses will blow. Now you are faced with the question of why did the fuse under the hood blow as well, did your cable fault and you have a problem with loading in the inverter as well? Use common sense. Terry
actually, that is not correct. the 20 amp fuse on the wire protects just that..the wire only. in case of a short somewhere after the battery and somewhere prior to the invertor, the inline fuse will blow. in the even that there is an internal short inside the invertor the built in fuse will blow. based on your logic, i would much rather have a smaller fuse inline to blow first...although your logic is a bit flawed. either way just fuse correctly for the wire guage and length and you will be fine (as im sure you already are considering this is a finished project..looks good!!)
