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The fuse will limit the current to the cigarette lighter to a safe level. If you are pulling too much, the fuse will simply blow. The fuse on you cigarette lighter circuit is 15 amps. To figure the amount of watts:
14 volts * 15 amps = 210 watts
So you can probably pull about 200 watts at the maximum.
A mac mini pulls about 30 watts at a reasonable load. If we guess your 19v dc adapter is 60% effiecient (conservative):
30 watts / .6 = 50 watts
The average 7" lcd screen uses around 10 watts.
50 watts (mac mini) + 10 watts (LCD) = approx. 60 watts.
I think you should be OK hooking up to cigarette lighter. If it were me though, to be on the safe side I would put a lesser fuse in, perhaps a 10amp, to give me an early warning that I was running a little bit close to the limit.
Peace.
__________________
** Denotes an "in car" post
In-Car posts made from passenger seat - Be safe, Don't Post and Drive.
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