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Originally Posted by emersonsc
The alternator output will not be an issue. Its going in a Semi-truck 
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Yeah, but regardless of whether the requirements of the diesel are 1W or 1Mega watt, the alternator may not be designed for an extra, lets assume worse case 700W.
Get what I am saying? You blow the alternator on an 18 wheeler, and you may just lose your job, or you could spend $1000 or more repairing it.
I not trying to totally shoot down your idea here, were I in the same situation, believe me I would be looking to carry my PC also. However, you should SERIOUSLY look at the specs on the alternator first.
For example: Average Current capability of the alt. of and 18 wheeler = 200A, Current requirement of the truck AVERAGE = 150A (this I do not know for a fact, but it is just an example), with maybe an extra 25A consumption under worse case scenario, i.e. hauling, up hill,
current surges, etc....
That leaves you 25A, to work with. Worse case scenario, your computer consumes 700W/12V = 58.33A. Never mind the fact that any inverter will not be 100% efficient in the conversion process, and it too will consume power. Add, lets say 10A, at 12V that is 120 watts.
So, 120W + 700W = 820W to run a 700W computer. That would be an extra 820W/12v = 68.333A required from an the alternator.
As stated, better hope someone seriously over spec'd the alternator.
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EDIT: just noticed the monitor - my 22" acer uses 1.5amps = 180watts so add that as well.
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There is no way that monitor consumes 180W, something is not right.