How to Charge Laptop Battery without Inverter - Fiberglass RV
Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×

Thread Tools Search this Thread Display Modes
Old 04-25-2014, 05:26 AM   #1
Senior Member
Name: Huck
Trailer: ParkLiner
Posts: 852
How to Charge Laptop Battery without Inverter

The solutions I see for charging a laptop battery first convert dc to ac using an inverter., then you plug the laptop charger into the inverter and convert ac back to dc to charge the battery.

What is the solution to just use 12 v dc to charge a laptop?
Huck is offline   Reply With Quote
Old 04-25-2014, 05:45 AM   #2
Pam Garlow's Avatar
Trailer: U-Haul 1985
Posts: 3,436
Using the inverter sounds pretty simple to me. I am a simple soul
Pam Garlow is offline   Reply With Quote
Old 04-25-2014, 07:12 AM   #3
Name: steve
Trailer: Born Free Fiberglass
Posts: 51
I have an HP laptop.
I purchased a DC to DC adapter/charger from Amazon.
One end plugs into the cigarette lighter. It has a "brick" in the line just like the OEM.
stev is offline   Reply With Quote
Old 04-25-2014, 07:53 AM   #4
Senior Member
Trailer: 2010 Casita 17 Spirit Deluxe
Posts: 204
We have an inverter that we use, and while we're traveling we plug it into the truck and charge while we drive.
Marsha D is offline   Reply With Quote
Old 04-25-2014, 08:05 AM   #5
Senior Member
Dudley's Avatar
Name: David
Trailer: 1998 Casita 17 SD
Posts: 786
Isn't that what the 3500 watt generator, that all the stickies have is, used for?
An inverter works or Targus makes a dual input AC and DC with multiple charge ends to fit damn near anything Targus APM10US Mobile 70 Universal AC/DC Adapter: Computers & Accessories
Dudley is offline   Reply With Quote
Old 04-25-2014, 08:22 AM   #6
Senior Member
Steve L.'s Avatar
Trailer: Casita Spirit Deluxe 2003 16 ft
Posts: 1,899
To just answer the question you asked, how to use 12vDC to charge your laptop, I too suggest you get the 12v adapter for your model laptop.

One byproduct of the “brick” in the adapter is that voltage regulation is sometimes/usually/often part of the package so you don’t get the 13+ vDC from a charger or alternator passed on to the computer which may or may not tolerate it. Some/most laptops will tolerate a range of acceptable DC voltages but lacking that info, voltage regulation might be a worthwhile feature and getting a DC cable made for your brand laptop eliminates the need for matching up components yourself.

Using an inverter to get the whole DC to AC to DC thing would suggest you were not plugged into shore power and the stacked inefficiencies of the double conversion are a bit of nuisance so I think you’re wise to avoid going there if battery capacity is limited.

A minor nice feature of my tow vehicle is a built in inverter. Its only good for 100W but it's handy for this sort of task while travelling. But I'm not going to idle the car for hours just to recharge something.
Steve L. is offline   Reply With Quote
Old 04-25-2014, 10:20 AM   #7
Senior Member
Gina D.'s Avatar
Trailer: Former Burro owner and fan!
Posts: 9,015
For many years..I have charged my laptops by turning them off, plugging an inverter it my DC outlet in the parked car, and letting it charge. It takes an hour or two, yes. But it hardly puts a dent in my battery. It takes very little current to charge a battery that is not in use. The inverter probably consumes more power than that battery takes.

(Note that your car battery needs to be in good condition..This bit me last year when my battery was at the end of it's life)

Most laptops require 18vdc at the power input, not 12v, (At least, all of mine do) so if you want to charge with DC only, you need a dc-dc convertor.
Gina D. is offline   Reply With Quote
Old 04-25-2014, 11:38 AM   #8
Senior Member
Name: Jon
Trailer: Burro
Posts: 127
Here ya go, something like this for a lap top ..simple cheap etc.
NEWFISHER is offline   Reply With Quote


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

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Battery didn't charge while Driving Anne H Problem Solving | Owners Helping Owners 25 08-13-2016 08:12 AM
Charger, battery monitor, float charge level Ami P Problem Solving | Owners Helping Owners 4 07-10-2009 06:12 AM
Power Inverter for Charging Laptop in the car? V'sGlassSleeper General Chat 24 09-03-2007 10:28 AM
Fluid, Battery Levels & Solar Charge Controller? peterh Electrical | Charging, Systems, Solar and Generators 9 04-27-2007 04:45 PM
Battery charge. BOBSMITH Problem Solving | Owners Helping Owners 6 07-31-2006 09:19 PM

» Upcoming Events
No events scheduled in
the next 465 days.
» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 11:50 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.