On Thu, Aug 21, 2008 at 3:11 PM, Ted Roche <[EMAIL PROTECTED]> wrote:
> Bill McGonigle wrote:
> >
> > So, it's a one-time configuration? I haz a vmware.
> >
>
> I think it's just an EEPROM setting. APCUPSD used to be able to
> reprogram the EEPROM directly. They moved the code out of there and i
On Thu, Aug 21, 2008 at 2:06 PM, Michael Pelletier <[EMAIL PROTECTED]> wrote:
> The main drawback to this approach is that you need a Windows
> system on which to run PowerChute.
PowerChute is/was available for Linux.
I think I've also seen a third-party utility (possibly part of the
NUT or a
On Thu, Aug 21, 2008 at 1:47 PM, Bill McGonigle <[EMAIL PROTECTED]> wrote:
> ... must cut speaker wire!
For most of the APC Smart-UPS line, pressing the "On" button briefly
will silence the "On Battery" alarm (but not the "Low Battery" alarm).
For the ones with only a single "On/Off" button, I
Bill McGonigle wrote:
>
> So, it's a one-time configuration? I haz a vmware.
>
I think it's just an EEPROM setting. APCUPSD used to be able to
reprogram the EEPROM directly. They moved the code out of there and into
the apctest module. Details here:
http://www.apcupsd.org/manual/manual.html#S
letier
Cc: 'Greater NH Linux User Group'
Subject: Re: Laptop external power from batteries (DC/DC)
On Aug 21, 2008, at 14:06, Michael Pelletier wrote:
> The main drawback
> to this approach is that you need a Windows system on which to run
> PowerChute.
So, it's a one-tim
On Aug 21, 2008, at 14:06, Michael Pelletier wrote:
> The main drawback
> to this approach is that you need a Windows system on which to run
> PowerChute.
So, it's a one-time configuration? I haz a vmware.
-Bill
-
Bill McGonigle, Owner Work: 603.448.4440
BFC Computing, LLC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bill McGonigle
Sent: Thursday, August 21, 2008 1:47 PM
To: Greater NH Linux User Group
Subject: Re: Laptop external power from batteries (DC/DC)
So, to the original point of demo'ing linux in the
Trying to be budget conscious I recalled that my office UPS (APC) is
1500VA and 865W, and has lead acid batteries inside. It claims 2
hours of runtime at 50W. I got it on sale for $120 or so.
So, I pulled out the Kill-A-Watt and plugged it inline with my
laptop, and got a 42W load mostly i
That would be 3 Li cells in series. My Dell Inspiron 5150 has a battery
labeled 14.8v, 6450mAh with a charger specified as 19.5v 6.7A. It's a
pain in the butt and next time I'm looking at a new laptop I will check
the battery voltage before buying. I think that 11.1v is a more common
battery for l
On Thu, Aug 21, 2008 at 9:52 AM, michael miller <[EMAIL PROTECTED]> wrote:
> The internal battery nominal voltage is 14.4 (4 x 3.6v cells in series).
FYI and FWIW, two Dell laptops I just checked indicate 11.1 volts on
the battery label.
-- Ben
___
gn
19.5v is only used for charging. The internal battery nominal voltage
is 14.4 (4 x 3.6v cells in series). Li, NiCd and NiMH batteries tend to
maintain a nearly constant voltage until they are almost fully
discharged at which point voltage drops rapidly. Lead acid battery
voltage tends to drop co
On Wed, Aug 20, 2008 at 8:03 PM, Bill McGonigle <[EMAIL PROTECTED]> wrote:
> I'm curious if the voltage drops as the battery discharges or remains fairly
> level.
I know that voltage does drop as a battery discharges, and that the
pattern of the voltage drop depends on the type of battery. I've
> From: Bill McGonigle <[EMAIL PROTECTED]>
> Date: Wed, 20 Aug 2008 20:03:27 -0400
> in series. So, if one bought two marine batteries, a bigger box, and
> was familiar with proper acid handling techniques, ought there be an
> electrical reason that 'just' making a 19.5v battery with the
>
On Aug 20, 2008, at 14:58, mike ledoux wrote:
> A good (and sadly, expensive) DC-DC voltage
> converter is only about 85% efficient, so to get the 19.5Vdc @ 4.62A
> you need, you will draw ~8.63A @ 12Vdc. ~5 hours becomes ~4.5.
Yeah, that does sound a bit wasteful if one is starting from scratch
Probably more than you wanted to know, but you asked. :)
On Mon, Aug 18, 2008 at 06:24:32PM -0400, Ben Scott wrote:
> Looking quickly, I can't seem to find amp-hour ratings from car
> battery makers/sellers. Google finds various third-party claims, but
> they're all over the map (25 to 100 Ah
> Date: Mon, 18 Aug 2008 20:50:35 -0400
> From: "Ben Scott" <[EMAIL PROTECTED]>
> multi-voltage adapters). Nasty alternator noise in the audio. Went
> I imagine sufficiently good quality components would not have
> trouble, but most laptops have cheap parts for both power and audio.
Noise d
I went through this same process a couple of years ago. Initially it
made no sense that a computer that uses components running on 12, 5, 3.3
and maybe 2.5vdc couldn't run off of a 12 vdc car battery. Ultimately
it turned out that it was the vendors choice of laptop battery that was
the problem.
On Mon, Aug 18, 2008 at 7:07 PM, Bill McGonigle <[EMAIL PROTECTED]> wrote:
> I've tried doing audio recording with my laptop running off of the car with
> an inverter and the electrical noise ruined the effort.
FWIW...
Circa 1992, I spent some time trying to get a personal portable CD
player
On Monday 18 August 2008 18:24, Ben Scott wrote:
> Bringing this thread over here from gnhlug-org...
> According to the sticker on the
> bottom, it's rated for 19.5 VDC at 4.62 A.
That number may be considerably higher for several reasons. One is
government regulation for the safety (fire
On Aug 18, 2008, at 18:24, Ben Scott wrote:
> Someone brought up the idea of powering a laptop from DC sources,
> rather than the traditional AC power bricks. This is strictly about
> external power, not the laptop's built-in batteries.
I'll admit to it and just mention here that it came up in
The Ah of a battery may depend quite a lot on the current drawn from it; I'd
look for a datasheet, it probably has an Ah/current graph.
You need a pretty high-power switcher to feed that current at 19.5VDC, in
electronics-land that's a TON of power. Definitely something with an
external power FET
Bringing this thread over here from gnhlug-org...
Someone brought up the idea of powering a laptop from DC sources,
rather than the traditional AC power bricks. This is strictly about
external power, not the laptop's built-in batteries.
Obviously, many laptops come with "travel adapters",
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