Inverter or DC-to-DC for laptop, etc.? - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of 27 Old 10-27-2009
Senior Member
 
Join Date: Sep 2009
Location: Kingston Washington
Posts: 530
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 6
 
I don't see electrically how a DC to C could increase voltage. You might just want to check that out with the manufacturer of the equipment your're using. I suspect that thie power supplies will work with a lower voltage input
Waltthesalt is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 27 Old 10-27-2009
Senior Member
 
NautiG's Avatar
 
Join Date: Apr 2007
Posts: 306
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 9
 
Quote:
Originally Posted by marujosortudo View Post
klem,

As far as running other stuff goes, I'm planning to keep my electrical needs minimal and will really only have laptop and fridge as major draws. Hopefully any weird AC equipment I have can be reserved for the rare shore power hookup.

Cheers, Colin
You think you are going to run a fridge minimally? Ok, now all bets are off. Do you have an iGo adapter for that thing?
NautiG is offline  
Quote Quick Reply Share with Facebook
post #13 of 27 Old 10-27-2009 Thread Starter
Member
 
Join Date: Oct 2009
Location: Maine Coast
Posts: 64
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
NautiG, Well, the ice box/fridge is a DC model and will be run near full time to be clear. This will be my primary large draw. Laptop will probably be second, and then house lights, GPS, etc. I can charge the house batteries from shore power or off the diesel with a big, dedicated alternator. I'll probably be adding solar at some point. Everything I need on the boat will be 12VDC except for my laptop and some other light electronic gear (camera, 3G modem, etc.)

CrazyRu, thanks for the feedback on reliability and efficiency. I know that inverters function much more efficiently near their maximum draw, so that's why I was looking at a 200W model (smallest I could find).

Waltthesalt, my understanding is that DC-to-DC converters that bring up voltage actually go to AC internally to go through a transformer. I'm guessing the improvement in efficiency (over a large inverter) here would just be that the converter is sized smaller and closer to its max load. Not sure, though.
marujosortudo is offline  
Quote Quick Reply Share with Facebook
post #14 of 27 Old 10-27-2009
Senior Member
 
Maine Sail's Avatar
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,877
Thanks: 20
Thanked 219 Times in 167 Posts
Rep Power: 16
       
Quote:
Originally Posted by marujosortudo View Post
Actually, it looks like the iGo everywhereMAX might work very well for my needs (minus not resisting the marine environment especially well, I assume). Anyone using these? Any opinions?

-Colin
Great products I have a iGo charger that I use on three different lap tops, two cell phones plus my iPods..

As one who puts who puts on 70K+ miles per year in the car while running a laptop via a DC adapter, for work, I have yet to see even one failure in 13 years of running & charging laptops in my cars and boats.

I have had IBM DC adapters, Targus, HP, ASUS, iGo etc. etc. as my company changes computer hardware about once every two years and between my wife and I we have 4 laptops of our own plus work computers.

Just got a new work tablet last week and once again it takes a different DC adapter than the previous one. For my personal computers I mostly use my iGo but my NetBook requires a fixed 12V, not 14.2 so I had to buy the ASUS DC adapter. I have more DC adapters than even makes sense even though many of the computers are long gone.

I also use the same DC adapters on my boat and again have never once had a failure of a DC adapter. Boat voltage and car voltage have virtually identical ranges.

Go with the iGo you'll like it..

______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 10-27-2009 at 10:08 PM.
Maine Sail is offline  
Quote Quick Reply Share with Facebook
post #15 of 27 Old 10-27-2009 Thread Starter
Member
 
Join Date: Oct 2009
Location: Maine Coast
Posts: 64
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Great, sounds like I'll try an iGo and see if my experience is a match.

Thanks, Maine Sail --from Downeast
marujosortudo is offline  
Quote Quick Reply Share with Facebook
post #16 of 27 Old 10-27-2009
Handsome devil
 
Stillraining's Avatar
 
Join Date: Jan 2008
Location: LaConner,Washington
Posts: 3,477
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 10
     
I remember a thread about this last year...DC to DC convetres were called switch gear by some in the know. and there was alot of numbers flying around. In the end I think it was well recieved that as you stated using a converter properly sized for the job does one well.

"Go Simple...Go Large"

Relationships are everything to me..everything else in life are just tools to enhance them.


The purchase price of a boat is just the admittance fee to the dance...you still have to spend money on the girl...so court one with something going for her with pleasing and desirable character traits others desire as well... or you could find yourself in a disillusioned relationship contemplating an expensive divorce.
Stillraining is offline  
Quote Quick Reply Share with Facebook
post #17 of 27 Old 10-28-2009
Mermaid Hunter
 
SVAuspicious's Avatar
 
Join Date: Oct 2006
Location: on the boat - Chesapeake
Posts: 3,984
Thanks: 0
Thanked 158 Times in 141 Posts
Rep Power: 9
 
Not all converters are alike. Some make a lot more radio frequency noise than others - check your radios (especially HF if you have one) with the converter plugged into 12V and not. If it's really noisy take it back and try another brand.

sail fast and eat well, dave
S/V Auspicious
AuspiciousWorks.com
beware "cut and paste" sailors.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
SVAuspicious is offline  
Quote Quick Reply Share with Facebook
post #18 of 27 Old 10-28-2009
Reward for lost Kraken!
 
hellosailor's Avatar
 
Join Date: Apr 2006
Posts: 11,491
Thanks: 5
Thanked 132 Times in 129 Posts
Rep Power: 11
   
Inverters tend to be efficient only near full load (i.e. 90% of their rating) and using dc-ac-dc conversion with two bricks is doubly inefficient.

I'm using an older Igo, which can run directly off DC or AC (many contacts in the power cords, big brick, I suspect two separate "boxes" are in the box and I've seen much smaller slimmer newer designs) and it works for me.

Your best best is always dc-dc without the extra ac invertor, for efficiency and potential electrical noise problems, interference caused by two boxes instead of just one.
hellosailor is offline  
Quote Quick Reply Share with Facebook
post #19 of 27 Old 10-28-2009
Senior Member
 
celenoglu's Avatar
 
Join Date: Dec 2008
Posts: 672
Thanks: 0
Thanked 14 Times in 13 Posts
Rep Power: 7
 
An inverter or a dc to dc will work fine. Inverter might be a better solution because most of the batteries like charges to have some ripple. In any casre you do not need a pure sine inverter.
celenoglu is online now  
Quote Quick Reply Share with Facebook
post #20 of 27 Old 10-28-2009
Glad I found Sailnet
 
Bene505's Avatar
 
Join Date: Jul 2008
Posts: 3,817
Thanks: 14
Thanked 51 Times in 50 Posts
Rep Power: 9
   
If you REALLY want to be a power miser, check the voltage of your batteries over their full operating range, if they are less than 12v at any point during use, then make a DC-to-lower-voltage-DC converter and add some really heavy duty spike protection for during engine startup. Lowering DC voltage is very energy efficient, and the lowering circuitry will make sure no steady higher voltage will have an effect. Hot wire that straight into an old battery case with the actual battery cells removed. (You can't get better than that without breaking open the computer. And even doing that would have no benefit unless you are using golf cart batteries for your house bank and tap 6v off one of the batteries, and then feed that into select spots within your computer.)

I could say more about this method of using the battery case, or even design something that would work if there's enough interest.

For the money I think you'd be better off swapping all yor interior lights for LEDs. There are great threads here on the best kind to get - search for the comparison testing by Mainesail.

.
.
Great minds discuss ideas;
Average minds discuss events;
Small minds discuss people.
.
The best minds discuss sailing (and a little bit of politics). I don't know why. It's a mystery!
.

Last edited by Bene505; 10-28-2009 at 10:03 AM.
Bene505 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Inverter Installation MSam Gear & Maintenance 2 04-07-2002 04:14 PM
Inverter Installation Tom Wood Gear and Maintenance Articles 0 01-20-2001 07:00 PM

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

BB code is On
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