automobile power supply

Archived from groups: comp.sys.laptops (More info?)

"Rob" <bucfan11SPAM@earthlink.net> wrote in message
news:2hq666FfbtfvU1@uni-berlin.de...
> Does anyone know if there is a automobile power supply (Plugs in your
power
> outlet) for a emachines m5312. I can't seem to find one, emachines don't
> have one on their web site.
> Thanks.
>
> --
> Rob

I found one here: http://www.shoplaptop.net/emm5m5m5m5m5.html

Thanks.
Rob
>
>

Archived from groups: comp.sys.laptops (More info?)

The DC to AC inverter usually cost less and can be used for other low power
consumption devices.


"Sava777" <sava777@comcast.net> wrote in message
news:chTtc.7899$js4.5001@attbi_s51...
> This goes for all laptops:
> The best alternative is,
> Just buy a DC to AC adapter of 75 watts o more.
> you will be glad you did.
>
> "Rob" <bucfan11SPAM@earthlink.net> wrote in message
> news:2hq666FfbtfvU1@uni-berlin.de...
> > Does anyone know if there is a automobile power supply (Plugs in your
> power
> > outlet) for a emachines m5312. I can't seem to find one, emachines don't
> > have one on their web site.
> > Thanks.
> >
> > --
> > Rob
> >
> >
>
>

Archived from groups: comp.sys.laptops (More info?)

"Rob" <bucfan11SPAM@earthlink.net> wrote in message
news:2hq93nFg1l1qU1@uni-berlin.de...
>
> "Rob" <bucfan11SPAM@earthlink.net> wrote in message
> news:2hq666FfbtfvU1@uni-berlin.de...
> > Does anyone know if there is a automobile power supply (Plugs in your
> power
> > outlet) for a emachines m5312. I can't seem to find one, emachines don't
> > have one on their web site.
> > Thanks.
> >
> > --
> > Rob
>
> I found one here: http://www.shoplaptop.net/emm5m5m5m5m5.html
>
Interesting: the title describes the adapter as being for emachines while
the description says Compaq. Get an inverter as the others have suggested -
they're cheaper and useful for powering other electronic devices as well.

Archived from groups: comp.sys.laptops (More info?)

Actually, I don't agree that this is the best solution, but it will
usually work. However, 75 watts is really not enough. There are
laptops that use as much as 120-160 watts, and there are LOTS of laptops
that use 75 watts or more. However, that is the laptop's AC adapter
OUTPUT rating. The power adapters are only 60% to 80% efficient, so if
have a 75 watt laptop power supply (15 volts at 5 amps, my Toshiba 1415)
that is only 75% efficient, you will need a 100 watt inverter to power
it. But the Toshiba A45 has a 15 volt at 8 amp adapter (120 watts); if
it's efficiency is 75%, you would need a 150 watt inverter.


Sava777 wrote:

> This goes for all laptops:
> The best alternative is,
> Just buy a DC to AC adapter of 75 watts o more.
> you will be glad you did.
>
> "Rob" <bucfan11SPAM@earthlink.net> wrote in message
> news:2hq666FfbtfvU1@uni-berlin.de...
>
>>Does anyone know if there is a automobile power supply (Plugs in your
>
> power
>
>>outlet) for a emachines m5312. I can't seem to find one, emachines don't
>>have one on their web site.
>>Thanks.
>>
>>--
>>Rob
>>
>>
>
>
>

Archived from groups: comp.sys.laptops (More info?)

The drawbacks to using an inverter vs. using an air/auto adapter to run
a laptop in a vehicle are as follows:

1. It's two physical units and a lot of wiring.

2. Both the inverter and the laptop AC adapter are only 60% to 80%
efficient. The combined efficiency could be as low as 36%; thus, it
could take nearly 200 watts from the car's electrical system to run a
75-watt laptop.

3. The output of the inverter is not sine-wave. While probably more
than 85% of inverter / power supply combinations will work, there is a
chance of it not working, or of causing overheating or even damage to
the laptop AC adapter.

An actual air/auto power supply is a better solution, other things being
equal.



Ian S wrote:

> "Barry Watzman" <WatzmanNOSPAM@neo.rr.com> wrote in message
> news:40B8B3B6.7010100@neo.rr.com...
>
>>Actually, I don't agree that this is the best solution, but it will
>>usually work.
>
>
> What are the drawbacks to an inverter that you see? You say "usually". I'd
> be interested to learn of situtaions where an appropriately powerful
> inverter won't work for a laptop.
>
> However, 75 watts is really not enough. There are
>
>>laptops that use as much as 120-160 watts, and there are LOTS of laptops
>>that use 75 watts or more. However, that is the laptop's AC adapter
>>OUTPUT rating. The power adapters are only 60% to 80% efficient, so if
>>have a 75 watt laptop power supply (15 volts at 5 amps, my Toshiba 1415)
>>that is only 75% efficient, you will need a 100 watt inverter to power
>>it. But the Toshiba A45 has a 15 volt at 8 amp adapter (120 watts); if
>>it's efficiency is 75%, you would need a 150 watt inverter.
>
>
> I would agree with the power requirements especially since inverters are so
> cheap these days. Fry's Electronics has a Coleman branded one rated at 200
> watts for $20 this weekend.
>
> IMHO, an inverter combined with an orginal equipment AC laptop adapter is
> the best solution. The OP found a car adapter for his emachines laptop but
> from the ad, it looks more like a universal adapter. While that's probably
> OK, I'd prefer to have my original IBM adapter plugging directly into my
> Thinkpad.
>
>>
>>Sava777 wrote:
>>
>>
>>>This goes for all laptops:
>>>The best alternative is,
>>>Just buy a DC to AC adapter of 75 watts o more.
>>>you will be glad you did.
>>>
>>>"Rob" <bucfan11SPAM@earthlink.net> wrote in message
>>>news:2hq666FfbtfvU1@uni-berlin.de...
>>>
>>>
>>>>Does anyone know if there is a automobile power supply (Plugs in your
>>>
>>>power
>>>
>>>
>>>>outlet) for a emachines m5312. I can't seem to find one, emachines don't
>>>>have one on their web site.
>>>>Thanks.
>>>>
>>>>--
>>>>Rob
>>>>
>>>>
>>>
>>>
>>>
>
>