pc chart display - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #11  
Old 09-03-2006
hellosailor's Avatar
Senior Member
 
Join Date: Apr 2006
Posts: 10,362
Thanks: 1
Thanked 72 Times in 70 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Typical laptops consume about 45W of power. The ones that use a Pentium4 or other non-mobile chip (and Intel warned them not to build laptops with that chip) will burn 75W or more. So if your laptop doesn't use a mobile chip...you've got a problem.

The DC-DC power adapter is a MUST, as others have said. Try Kensington or Targus, and sometimes you can find them on eBay for $30. They are also sold as "air power" adapters, same adapter is used on commercial airplanes.

If you go into the power management features on your laptop, and set it up for maximum power conservation, you can cut your power consumption in half. The laptop can and should be powering down the hard drive and other drives, and if you have accessories you can often manually power them down as well. Some laptops let you manually shut the screen (certainly if you close the lid!) but unless you're interactively piloting the boat...dim the screen (cuts power to half of what is used with a bright screen) or shut the screen down (cuts entire power consumption in half).

There are many ways to skin the cat.

Bottom line...for what real paper charts cost? You can buy a dedicated deep cycle battery for the laptop. A Group31 for $125 or so should give you 100AH of power, and that should give you 20+ hours of laptop run time using a DC-DC power supply. That's cheaper than almost any other option.
Reply With Quote Share with Facebook
  #12  
Old 09-03-2006
Canibul's Avatar
Banned
 
Join Date: Aug 2006
Location: Land of MakeDoo.
Posts: 107
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Canibul is on a distinguished road
what a great idea, a dedicated battery. Simple and effective. And it means that you have a spare should your starter battery ever go tits up. Thanks for that.
Reply With Quote Share with Facebook
  #13  
Old 09-03-2006
Junior Member
 
Join Date: Sep 2005
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
sundown2 is on a distinguished road
I appreciate ALL advice

I appreciate everyone's input to my questions - I hope no one felt I was slagging thier replies.

Hellosailor: I like the idea of a dedicated battery - that would give peace of mind. It is funny that I did not think of that because an insurance company I used to deal with required at least one VHF radio be on a seperate battery. I must be getting old.
With reference to dc to dc power supply: is this what you guys mean ?
kensington Universal car/air power adaptor 33051

(sorry I can not seem to copy a link to the above product)
Reply With Quote Share with Facebook
  #14  
Old 09-03-2006
hellosailor's Avatar
Senior Member
 
Join Date: Apr 2006
Posts: 10,362
Thanks: 1
Thanked 72 Times in 70 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Sundown-
"kensington Universal car/air power adaptor 33051" EXACTLY!
Do check that it supplies enough power for your lapop model though, and that it comes with a matching tip for the power cord. Mine is a Targus, and when I opened it up to find out it didn't have the tip I needed, I called them up and the customer service rep said "Well, if you just bought it you shouldn't have to BUY another set of tips, why don't I just send them to you first class at no charge?"

Kensington are known for some of the best customer service on the planet. Like I told the nice lady, I'd make sure other people found out about that.
Reply With Quote Share with Facebook
  #15  
Old 09-03-2006
Canibul's Avatar
Banned
 
Join Date: Aug 2006
Location: Land of MakeDoo.
Posts: 107
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Canibul is on a distinguished road
I remember now, that mine was a Targus, as well. It had the adaptor for my Sony laptop, at the time. I used it a lot with the engine off, sitting in a cab waiting for a fare. never had a problem.
Reply With Quote Share with Facebook
  #16  
Old 09-03-2006
Junior Member
 
Join Date: Sep 2005
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
sundown2 is on a distinguished road
Thumbs up

Thanks everone for all the help. I am not sure which make/model laptops I have on the boat but I will check in the morning then order Kensington adaptor if they have the right ends. [IMG]images/icons/icon14.gif[/IMG]
Reply With Quote Share with Facebook
  #17  
Old 09-07-2006
Junior Member
 
Join Date: Sep 2005
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
sundown2 is on a distinguished road
In the interest of General Information this is an excerpt of an email from my brother (who is an electronics tech) in response to my query of "how efficient is it to drive my via an inverter"?

evry time you convert ac to dc or back, you can figure on losing 10% of your power to heat. So taking 12 volt through an inverter to 110 and back to 12 volt will result in a loss of 15 -20%
I have never dealt with dc to dc but it sounds better. Take your input voltage times your input current and that gives input power. Now take output voltage times output current and that gives output power. The difference is the loss to heat. Now mutiply the difference and that gives a figure with a little less manufacture BS.

I have not done the math yet but he has lots of years of experience so I trust he knows what he is talking about.
Reply With Quote Share with Facebook
  #18  
Old 09-08-2006
foxglove's Avatar
Senior Member
 
Join Date: Dec 2002
Location: Columbus OH
Posts: 180
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
foxglove is on a distinguished road
Yotfix has my vote. Use dead reacon, TVMDC, take LOPs, adjust for set and drift and leeway form wind to find course to steer.

GPS, if you have it, should always be on and available for confirmation. In fact, the law for professional captains is that all nav equipment on board must be in working order and available when underway.
Reply With Quote Share with Facebook
  #19  
Old 09-08-2006
Canibul's Avatar
Banned
 
Join Date: Aug 2006
Location: Land of MakeDoo.
Posts: 107
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Canibul is on a distinguished road
sundown, your brother's simple explanation makes a lot of sense. Everything in that alternator-battery-inverter-converter-dcbatts gets warm when operating. SOMETHING is sure being converted to heat and it aint seawater.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
USA. Solo Round-the-World sailboat skipper to display boat at ... - BYM News (press release) NewsReader News Feeds 0 08-31-2006 07:15 AM
Brass Pelican Chart Markers? Cap'nJeff Gear & Maintenance 2 06-27-2006 08:14 AM
Yeoman Paper Chart Plotter inadee Gear & Maintenance 0 05-08-2002 12:32 AM
Chart Plotter Installation rpowell Gear & Maintenance 3 12-31-2001 06:29 AM
CHART PLOTTERS SHIMSHON General Discussion (sailing related) 6 02-27-2001 07:54 AM


All times are GMT -4. The time now is 11:05 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012