75 Amp 750w inverter - 100 Amp fuse OK?

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Bogo said:
No, it's the same for both AC and DC. The electrons are agnostic and don't care if they are being used in DC current or AC current. They will do the same amount of work both ways. It is just very easy to step up and down AC voltages with a simple transformer. It takes a much more complex circuit to step up or down DC voltages. Therefore AC won out.
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dc needs more area to overcome voltage drop over a vast distribution system which would have require MASSIVE amounts of precious copper to do so. a/c would only require massive amounts...Old Tommy didn't have a hankerin to get a ROI;) but yes, you are correct; current is current...I splained it poorly
 
JCruse said:
Oh I was going to run the main cables direct to the inverter posts (with an under hood ANL fuse) and then tap two 12awg wires directly off the posts to the DC socket, with another fuse in-line of course. No good?


Oh what gauge wire from the fuse box or splitter to the unit?
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That'll work fine; another fuse block would just make for a clean easily upgradeable setup. What you're going to do always seems to start off fine but if/when you decide to add other things it becomes a cluster.
Wire size to the unit would just depend on the draw and length of the run. For stuff like that I always err on the large side and I would probably use 8ga or something along that line just to be safe.
 
Why don't you guys say a single thing about skin affect in DC? Witch is the reason for fine strand cable used in welding leads. And by the way a par of awg 8 wires will hold 40 amps each or 80 if ran in a par. The two have to be the same length, but the code book will tell you that the smallest wire to be ran parallel is 1/0 witch is bigger than I think this guy needs for a inverter in an 80. And tesla did not kill cows and ducks with Edison. The elephant that was electrocuted was responsible for killing several people. And was going to Be put down any way.
 
MILLHOUSE said:
Why don't you guys say a single thing about skin affect in DC? Witch is the reason for fine strand cable used in welding leads. And by the way a par of awg 8 wires will hold 40 amps each or 80 if ran in a par. The two have to be the same length, but the code book will tell you that the smallest wire to be ran parallel is 1/0 witch is bigger than I think this guy needs for a inverter in an 80. And tesla did not kill cows and ducks with Edison. The elephant that was electrocuted was responsible for killing several people. And was going to Be put down any way.
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Skin effect with DC? - please educate me.

Welding cables use fine strand wires for flexibility.

And what are these witches you speak of? Have they got something to do with DC skin effect? :)

cheers,
george.
 
With DC the current uses the out side of the copper wire. The more wire the more amps, compare to the " size" of the wire. In other words not all 1/0 cables are going to be able to handle the same load. And the witches would be me the dum ass that is a horse shet speller.
 
MILLHOUSE said:
With DC the current uses the out side of the copper wire. The more wire the more amps, compare to the " size" of the wire. In other words not all 1/0 cables are going to be able to handle the same load. And the witches would be me the dum ass that is a horse shet speller.
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Well, seems like you are confused (in addition to your spelling impediment).... Skin effect is NOT applicable to DC. DC uses the ENTIRE CONDUCTOR DIAMETER. Skin effect is applicable to AC and the depth from the surface/skin reduces as frequency increases.

I figured by asking you to educate me you would at least do some google searching to learn whether or not skin effect was pertinent to DC (it isn't).

Glad you have your witches sorted out :)

cheers,
george.
 
wow, I couldn't pay for better comedy. thanks for the entertainment. please anyone reading this later, this was merely an experiment in group psychology.... as far as technical, there are great books out there on how to wire your car accessories and professionals you can pay if your still nervous about it.
 
Well I just got a whole bunch of 4 gauge cable to wire up the inverter. Copper coated aluminum wire. Lets argue about that for a while. :)

What do y'all think about copper coated aluminum wiring?

Knu-Koncepts brand. It's extremely flexible and a true 4 gauge. (I will not be running a fridge or any other high draw appliances)
 
Aluminum has crappy fatigue life.:meh::flipoff2:
 
Well let us ask the expert gorge. I would have no idea I am only a fxxxing journey man Elct. for 17 years with a large pile of license to work is different states. I only work on oil wells that run on ad and dc. But I can not spell as good as him. Ask him if Olms law has a different calc for the two?
 
MILLHOUSE said:
Well let us ask the expert gorge. I would have no idea I am only a ****ing journey man Elct. for 17 years with a large pile of license to work is different states. I only work on oil wells that run on ad and dc. But I can not spell as good as him. Ask him if Olms law has a different calc for the two?
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Come on Millhouse, spill it.

If you answer my question I'll get you a date with Lisa!






































;)



lisa-simpson-heart-lg.jpg
 
That all depends on the 60c column or 75c column please refer to 310. 15 (c) in your nec book.
 
Or does gorge have your copy?
 
This is the biggest waist of my time. I should be putting out the electric fire on that 4721 volt transformer I was working on to day. The one with the volt drop calc that has 9000 plus feet of cable in the ckt after work I will consult the god of all things true GOOGLE!!!!! DC USES THE OUT SIDE OF THE WIRE AC USES THE IN SIDE CENTER IF THE WIRE!!!!!!! Skin is slang talk for that, AC also has skin affect. It has to do with the lines of flux. Two totally different things............. Wait a min. what was this original post about. My witch that tells my to go on this web site and say s*** to a holes that I would not have the time of day for in the real world.:bang::censor::censor:
 
I've heard the same thing about audio cables. The higher treble frequencies travel closer to the surface of the wire. Don't know if it's true. But it helps sell some probably overly thick speaker wire, and guitar cables.
 
Yes it does
 
Now I want Lisa's phone number damit!!!
 
Millhouse... you seem a little upset.

Sorry if I upset you. I was just pointing out that you were incorrect in your statement that skin effect occurs with DC, it doesn't. Skin effect occurs with an AC signal, the depth that conduction primarily occurs reduces as the frequency increases. Hence at very high frequencies (RF) it is possible to use hollow conductors since the signal is only traveling through the 'skin'. At DC the signal/current travels through the entire conductor diameter, there is no skin effect.

cheers,
george.
 
Aluminum cold flows, over time twisted and screw type connections will loosen. It Loose connection = resistive connections
P=I^2*R
So as the resistance in the connection increases the power loss in the connection increases. Power loss is dissipated in the form of heat. This was responsible for a number of trailer fires shortly after manufacture home builders went to aluminum wiring.

There are ways to safely use aluminum wire but do a little research before you use it.


BTW George is correct; AC skin effect, DC no skin effect. Not that it would affect which wire you would use.
 
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