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post #1 of 22 Old 02-13-2017 Thread Starter
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Running Laptops on 12v

How are you running laptops to 12 volt?
What is efficient and safe?
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post #2 of 22 Old 02-13-2017
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Re: Running Laptops on 12v

12 volt to 5 volt usb adapter just make sure it has high enough amp output for the device. I have a lighter socket usb adapter that is rated at 5v 4.8 amp output
https://www.bluesea.com/products/104...r_Socket_Mount
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post #3 of 22 Old 02-13-2017
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Re: Running Laptops on 12v

Get a PWR+ unit 12 v to 19 v.

See https://pwr-plus.com/ for the model number you need. NB often more than one.

Either buy direct or check out Amazon Ebay etc.
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Re: Running Laptops on 12v

I use a small inverter. It's not terribly efficient, going from 12DC to 120AC back to 19DC, but it's simple and since I'm using the factory power adapter I know it's getting the right voltage.

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post #5 of 22 Old 02-13-2017
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Re: Running Laptops on 12v

Most laptops run on 17 to 19 volts, DC. Therefor you need a CONverter to step your 12 volts to their operating voltage.
Go online and look for a "car" adapter (with a cigarette lighter plug) for your brand and model of laptop. They can be had for us$9 and change up to about us$75.00. The expensive one I bought has worked faultlessly for 6 years, but the cheapos do not fit the receptacles well and heat up a bit, though not dangerously, IMO.
Install a couple of quality cigarette lighter receptacles (Blue Sea?) around the boat where you wish to use the laptop and you'll be fine.
Our laptops run between 2.7 and 5.3 amps of 12 volts depending on their battery SOC and their power settings.
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Re: Running Laptops on 12v

I have had several "Car charger" type power supplies for both mac and pc get so hot they melted. Fire hazard.

I have a good quality 250w inverter that also plugs into the same cig lighter socket. It does not heat up very much and works fine. The inefficiencies are minimal at that power level.
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Re: Running Laptops on 12v

Quote:
Originally Posted by TQA View Post
Get a PWR+ unit 12 v to 19 v.

See https://pwr-plus.com/ for the model number you need. NB often more than one.

Either buy direct or check out Amazon Ebay etc.
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Re: Running Laptops on 12v

Much of this will have to do with the age of your laptop. Many of the older laptops drew a lot of power, many 75 to 100-watts, depending on the display. The newer netbook PCs, draw a lot less power, but like nearly all PCs, they run on 16-volt power supplies therefore an inverter will be needed. I have a 2,500-watt inverter and 550 amps of house batteries on the boat, so for me, it's not a problem.

Good luck,

Gary
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post #9 of 22 Old 02-13-2017
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Re: Running Laptops on 12v

Quote:
Originally Posted by TQA View Post
Get a PWR+ unit 12 v to 19 v.

See https://pwr-plus.com/ for the model number you need. NB often more than one.

Either buy direct or check out Amazon Ebay etc.
This!

going on 6 years with a HP Windows XP laptop by doing this.

[EDIT] I did not want to use the cigarette lighter adapter that the 19V power brick came with, and I had already installed a 6 fuse sub-panel at the Nav. Station for things like the 12V outlet, the VHF, and something else that I can't remember (I'm in FL, and the boat is in RI). There is a breaker on the main panel labeled "Nav. Station," rather than 6 discrete breakers. I cut off the 12V male plug end and wired the 19V 95W power brick directly to this sub panel and used a 5A fuse.


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Last edited by eherlihy; 02-14-2017 at 01:27 PM.
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post #10 of 22 Old 02-14-2017
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Re: Running Laptops on 12v

Would it matter if the inverter was a pure sine or modified for laptop charging?
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