That's a good point, I will need to look at the power supply and see what it is putting out.

 

So, I'm installing a new inverter in my car this weekend for a project of mine and the guy I purchased it from tells me that I only need a 1 amp fuse. He said I actually only need a 0.44 amp fuse. My inverter is 300W max. He says the way I should be doing the calculations is that the inverter only has a max current draw of .4 amps so I should be looking at it as .4A * 10% = .44A fuse.

 

Are you high? Power is voltage times current. The battery supplies 12V, so the current draw at 300W will be 300W/12V=25Amps. Sure, the current supplied to the 110V side is less than 4amps (300W/110V = 2.72 amps), but you're not putting the fuse on that side are you..

A 1amp fuse allows any device to use at the very theoretical most only 12W of power (or 14W if your engine is on).

 

^^The input is before it goes through a transformer. power in = power out. The input has to be 12V at whatever amperage is required to make the wattage draw.

You'll need a 25A fuse.

 

Sorry, I'm going to hijack this thread one last time. On my inverter there is a symbol to tell me which wire is positive/negative coming in but I can't understand it.

It's a minus sign with a circle around it then a line over to the right to a C then inside the C is a dot with a line over to the right to a plus sign inside another circle.

Hopefully that made sense. Anyways, my choices on the wires is a black one and then a black one with a white stripe on it.

 

^^Like this?

Attachment 408

That's a shielded/coaxial wire. The Outside of the wire is negative and the inside is positive.

Gotta love M$ paint artwork.

 

Yes that's it. So, what does that mean as far as for my installation?

 

It means if you cut the wire, you hook it up accordingly.

I'd hook the black one to ground and the other to power.