A Laptop's Power Consumption - SailNet Community
 
LinkBack Thread Tools
post #1 of 1 Old 10-06-1999 Thread Starter
Moderator
 
Join Date: Jan 2000
Posts: 162
Thanks: 0
Thanked 7 Times in 5 Posts
Rep Power: 16
 
A Laptop's Power Consumption

I have a Toshiba laptop which I use on board my boat. The boat has two 85 AH batteries. What would be the power consumption of my laptop?

Jim Sexton responds:

Assuming that your two 85 AH batteries are fully charged, connected in parallel, and that you’re running your Toshiba through the cigarette lighter adapter with 100 percent efficiency, you could expect your computer to run for about 56 hours (three amps into 170 AH) before your batteries go dead. This also assumes that you are not running anything else off the batteries like your GPS, radio, running lights, etc., and that your Toshiba can operate at 12 volts (it's rated at 15 volts) without tripping the internal reset due to low voltage. The only way to know this is to try it out or contact Toshiba, if you can't find any information on low-voltage operation in the user's manual.

Realistically, you should use the inverter because it operates at close to 90 percent efficiency and uses less than two amps of power. In this case you could expect your computer to operate for a maximum of 30 hours (five amps into 170 AH times 90 percent) before the batteries go dead. Again, I'm assuming that you have only the computer and inverter hooked up to the batteries. If you are using anything else, you need to determine its amperage and add that total to the five amps for the computer and the inverter, then divide that into 170 and multiply by 80 percent. (Other electrical/electronic units are not as efficient.) Of course, after the ship's batteries go dead, you can expect another two to three hours from the computer's internal battery. I would also recommend that you connect a voltmeter to your ship's batteries and keep an eye on it when you are using the computer or any other electronics solely on the batteries.

Jim Sexton is offline  
Closed Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is Off
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome