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07-10-2006, 04:55 PM
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#1 |
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Member (9 bit)
Join Date: Jul 2004
Posts: 395
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power inverter...how big?
Hi everyone,
I was thinking of buying a power inverter so i can charge my laptop in the car. I see on my power supply that it's listed as a 1.6Amp and 110VAC input and a 19VDC 3.42Amp output. now that gives me approx. 160Watts input and 65Watt output. If i bought a 160Watt inverter would that be enough? or should i buy the 200Watt one? Thanks for your time. ~FOX~ |
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07-10-2006, 05:05 PM
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#2 |
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Wrench Bender
Join Date: Dec 2002
Location: Plymouth,MN
Posts: 5,961
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Watts= Volts x Amps/110v x 1.6A =176watts. Go with the 200.
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"When sliding down the banister of life; look out for splinters pointing up."
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07-10-2006, 06:58 PM
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#3 |
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Moderator
Staff
Premium Member
Join Date: May 2004
Location: Baltimore, MD
Posts: 2,918
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Don't get a power inverter -- just get an auto-air adaptor instead. The Targus Mobile 70 is shown on Toshiba's site as being compatible with the M40x.
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Computer: Intel Core i5-750 2.66 GHz quad-core processor @ 3.71 GHz | Asus P7P55D-E motherboard | Crucial 4 GB DDR3-1333 RAM | nVidia GeForce 8600GT | 2x WD Caviar Black WD1501FASS 1.5TB hard drives in RAID 1 | Antec Sonata III case with Antec EarthWatts 500-watt PSU | Dual Dell UltraSharp 2408WFP 24" widescreens | Windows 7 Ultimate 64-bit Other: 2005 Subaru Legacy 2.5GT sedan 5MT | Samsung Epic 4G Smartphone | Mamiya M645 1000S medium-format SLR with 55mm f/2.8, 70mm f/2.8, 210mm f/4, teleconverter, 120 and 220 film backs | Olympus E-PL1 Micro-4/3s DSLR with 14-42mm and 40-150mm lenses |
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07-10-2006, 07:12 PM
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#4 |
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Member (9 bit)
Join Date: Jul 2004
Posts: 395
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flanzig: omg, i'm an idiot...back to grade 9 math!! thanks for the correction. (how am i ever going to live this down)
fulton: I had this Canadian Tire inverter picked out: http://www.canadiantire.ca/assortmen...romSearch=true for the price it can't be beat. And i currently have the 700Watt inverter mounted in my pick-up for camping, same brand as this one so I'm ok with the quality. Thanks guys! ~FOX~ |
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07-10-2006, 09:38 PM
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#5 |
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Moderator
Staff
Premium Member
Join Date: May 2004
Location: Baltimore, MD
Posts: 2,918
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To tell you the truth, an inverter is not an optimal solution for computer equipment. It offers "dirty power" and isn't very efficient. An auto-air adaptor is a straight DC-DC path.
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07-11-2006, 01:59 AM
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#6 |
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Member (9 bit)
Join Date: Jul 2004
Posts: 395
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fulton: I had no idea, hmm dirty power...who knew. I will look for one here in town, my problem is that I leave on friday so I was hoping to find something at a big box store in Canada. This might be a dumb question, but would it make a difference if the laptop was running or not? If I just charged the battery with it while it was powered down I mean.
~FOX~ |
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07-11-2006, 02:02 AM
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#7 |
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Member (9 bit)
Join Date: Jul 2004
Posts: 395
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that auto-air adaptor you linked to says it's a 70Watt (continuous) power unit. Don't I need one that's at least 176Watts?
thanks again. |
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07-11-2006, 02:04 AM
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#8 |
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Member (9 bit)
Join Date: Jul 2004
Posts: 395
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how about this one:
http://www.futureshop.ca/catalog/pro...31&catid=11346 Problem is the Wattage again. Last edited by Fox 3; 07-11-2006 at 02:07 AM. |
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07-11-2006, 02:42 AM
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#9 |
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Forum Administrator
Staff
Premium Member
Join Date: May 2000
Location: Joplin MO
Posts: 37,786
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No, you do the DC math for the output of an auto/air adapter because no AC is involved at all. 19 * 3.42 = 65
That Futureshop thing is way too small. Anything you use is okay as long as it can output 65 watts DC at 19 volts or 176 watts AC at 110 volts. |
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07-11-2006, 06:12 PM
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#10 |
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Member (9 bit)
Join Date: Jul 2004
Posts: 395
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Oh cool...so I can use my canadian tire one safely?
~FOX~ |
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07-12-2006, 04:54 AM
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#11 |
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Forum Administrator
Staff
Premium Member
Join Date: May 2000
Location: Joplin MO
Posts: 37,786
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I don't see why not. Yes, it's "dirty" power and will put a strain on the power supply brick but I have customers running laptops off inverters in their trucks with no problems.
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07-12-2006, 10:18 AM
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#12 |
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Member (9 bit)
Join Date: Jul 2004
Posts: 395
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excellent...that's what I wanted to hear!
many thanks. ~FOX~ |
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07-19-2006, 09:15 AM
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#13 |
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Member (10 bit)
Join Date: May 2005
Posts: 560
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Isn't power conditioning one of the primary tasks of a power supply unit anyway?
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