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Aldo Larrabiata
Guest
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 Posted:
Thu Dec 02, 2004 1:39 am Post subject:
Re: Using an inverter to charge lap top. |
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"Dave Plowman (News)" <dave@davenoise.co.uk> a écrit dans le message news:
4d166da1d6dave@davenoise.co.uk...
| Quote: | In article <41acdf7e$0$30435$8fcfb975@news.wanadoo.fr>,
Aldo Larrabiata <duschmoll@racer.com> wrote:
To get watts - multiply volts by amps. So 4.6 amps at 19 volts makes
87
watts. But this will be a peak current consumption - not average.
I'd say it's almost certainly a SMPS type rather than a 'plain' PS. A 5
Amp at 19 volts conventional unit would be pretty large.
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I agree. The 87 W probably takes into account a hard disk and a CD-ROM drive
working in the same time and an empty battery at the beginning of charge.
| Quote: | I'd also say the 1.5 Amps at 110 v is just an approximation - any supply
that consumed 180 watts for an output of 87 would get very hot indeed.
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Not exactly because it's not 180 Watts but 180 VoltAmperes. The difference
is due to the phase shift between the voltage and the current. This reactive
current doesn't induce heating. Only the efficiency needs to be considered
to evaluate the self heating. The dissipated power is in fact only and
fortunately 30 W, which is also rather high ! Touch the power block when
100% running. When hot you can barely keep the hand on its top.
| Quote: | *Honk if you love peace and quiet.
Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound. |
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pete
Guest
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| Posted:
Thu Dec 02, 2004 1:43 am Post subject:
Re: Using an inverter to charge lap top. |
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On Wed, 1 Dec 2004 09:25:03 -0800, "Jeff Strickland"
<spamcatcher@yahoo.net> wrote:
| Quote: | I forgot to mention the obvious; here in the Colonies we have a store called
Radio Shack. It sells all manner of electronic gadgets, stuff you can glue
and solder together yourself to build a radio. It also sells inverters. Take
your laptop in, and they will set you up with an inverter of the proper
capacity. Your car won't mind one bit.
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Yes that is what I intend to try with one of the local auto
electricians thanks.
pete |
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Matt O'Toole
Guest
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| Posted:
Thu Dec 02, 2004 1:47 am Post subject:
Re: Using an inverter to charge lap top. |
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Dave Plowman (News) wrote:
| Quote: | In article <10qmq9equhok722@corp.supernews.com>,
Jeff Strickland <spamcatcher@yahoo.net> wrote:
I used an inverter to run a lap top for about one year.
What was the inverter make and rating then please? pete
Sorry, I don't remember exaqctly what size it was, but I think it was
about 400 watts, which works out to about 3.75 amps, which is enough
to run a laptop.
I'd hope so. ;-)
Lap tops can usually be run from batteries, and if they really did
take 400 watts those batteries would be somewhat larger than the lap
top for a reasonable life.
To put it in perspective, a car battery of 70 amp/hr - a fairly normal
size - wouldn't manage 400 watts for 2 hours.
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Most laptops take about 75W.
Matt O.
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