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 into
the
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
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
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
___
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
-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 field
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
: '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-time configuration? I haz a vmware
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:
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 think
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
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 on
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.
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
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,
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
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
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 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 to
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.
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 depends
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