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#1
02-09-2010, 01:36 AM
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Correct size fuse for laptop
Not sure what section to put this in...
I ran a wire from the battery to my cig lighter and my GPS worked great, but as soon as I plugged in my laptop it blew the inline fuse I put on as protection. What size fuse should I be using so my laptop will work ok?
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k 
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#2
02-09-2010, 02:03 AM
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I would think the cig lighter would draw more than a laptop. Anyway I would think a 10A slow blow should be enough. What size is in there?
__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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#3
02-09-2010, 06:55 AM
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How are you plugging in the laptop? Direct DC or through a DC->AC inverter? 10A probably won't cut it for most modern laptops. You'll need 15-20A slow blow, especially if going through an inverter first as there will be additional losses.
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#4
02-09-2010, 11:27 AM
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The output from the power supply on my laptop with 16" screen and Intil Core 2 Duo is listed at 3.4a, I would expect a 10a to be plenty unless your computer has much more screen and power than this.
__________________
 Gone to the dark side - Jeff
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#5
02-09-2010, 12:36 PM
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It is going through a power inverter. Its a brand new Sony Vaio CW27FX i5 /w GT 330M graphics card so its semi-power hungry.
I think it was a 10amp fuse...The wiring was already there (I assume somebody had a phone plugged in before I got the car) along with the fuse so I just extended it to my nonfunctional lighter. I'll give a 15a fuse a shot. Thanks guys
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#6
02-09-2010, 12:45 PM
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Inverters, depends a lot on the efficiency of the inverter as to the amp-draw, cheap ones are ineffient and have lousy output waveforms, your power supply will run HOT and might be damaged eventually.
Try staging them so that you don't get all of the inrush current at once: plug in the inverter, turn it on, plug in the power-supply & laptop, then turn it on. I don't know what a separate fuse would be protecting, the cigarette lighter is already properly fused.
__________________
Gone to the dark side - Jeff
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#7
02-09-2010, 12:51 PM
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Quote:
Either way I like the fact I get constant power instead of it cutting out when the key is off.
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#8
02-09-2010, 01:04 PM
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Quote:
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