Cameron qu...@laptop.org
To: David Farning dfarn...@activitycentral.com
Cc: server-devel server-devel@lists.laptop.org, Tony Anderson
tony_ander...@usa.net
Subject: Re: [Server-devel] 12 Volt power system for School Servers.
Message-ID: 20130529222631.gb20...@us.netrek.org
Content
...@lists.laptop.org
[mailto:server-devel-boun...@lists.laptop.org] On Behalf Of James Cameron
Sent: Thursday, 30 May 2013 4:17 p.m.
To: Tony Anderson
Cc: server-devel
Subject: Re: [Server-devel] 12 Volt power system for School Servers.
Tony makes an interesting point that may be new to some:
On Thu, May 30
Tony could you share more information about your work on 12 Volt power
supplies for School Servers?
Whenever I see a School Server setup containing a 12V Battery, an inverter,
a power strip, and a couple of 120V to 12V power supplies to provide power
for the server and the AP... my eyes start to
On Wed, May 29, 2013 at 1:03 PM, David Farning
dfarn...@activitycentral.com wrote:
Tony could you share more information about your work on 12 Volt power
supplies for School Servers?
Whenever I see a School Server setup containing a 12V Battery, an inverter,
a power strip, and a couple of
The piece I am looking at is reducing the losses between the battery and
the server/AP.
Several systems have a 12V Battery which is inverted to 120AC which is then
transformed back to low voltage DC for input to the server/AP. That doesn't
seem very efficient.
Dave
On Wed, May 29, 2013 at 3:29
On Wed, 2013-05-29 at 15:03 -0500, David Farning wrote:
Tony could you share more information about your work on 12 Volt power
supplies for School Servers?
Whenever I see a School Server setup containing a 12V Battery, an
inverter, a power strip, and a couple of 120V to 12V power supplies
On Wed, 2013-05-29 at 15:42 -0500, David Farning wrote:
The piece I am looking at is reducing the losses between the battery
and the server/AP.
See my earlier response.
Several systems have a 12V Battery which is inverted to 120AC which is
then transformed back to low voltage DC for
On Wed, May 29, 2013 at 04:38:06PM -0500, Jerry Vonau wrote:
Is the inverter really needed for a XO? The step-down transformer used
on the XO puts out 13.5v but the XOs only need 11 volts to charge[1].
Therefore I believe you could run and/or charge the XOs directly from a
12v source like a
Thanks james,
Any thoughts on powering the AP?
On Wed, May 29, 2013 at 4:45 PM, James Cameron qu...@laptop.org wrote:
On Wed, May 29, 2013 at 04:38:06PM -0500, Jerry Vonau wrote:
Is the inverter really needed for a XO? The step-down transformer used
on the XO puts out 13.5v but the XOs
On Wed, May 29, 2013 at 04:51:47PM -0500, David Farning wrote:
Any thoughts on powering the AP?
They are all different.
First, select an AP that says it has a 12V input.
I would record the voltage without load emitted by the power supply
supplied by the manufacturer. This is a known maximum
On Wed, May 29, 2013 at 3:26 PM, James Cameron qu...@laptop.org wrote:
On Wed, May 29, 2013 at 04:51:47PM -0500, David Farning wrote:
Any thoughts on powering the AP?
They are all different.
Yep. The one we use in Bhagmalpur (India) and in Jamaica is the
Ubiquiti Picostation2 unit that runs
On Wed, May 29, 2013 at 5:26 PM, James Cameron qu...@laptop.org wrote:
If the AP was USB powered Wifi dongle, the problem goes away.
Speaking of, and this would only be appropriate for extremely small
deployments, but I started messing around on the XSCE with hostapd with a
wifi dongle this
Just a reminder to include po...@lists.laptop.org if this discussion
advances, the tightly focused electrical/energy list run by Richard Smith
for many years to come God willing =)
http://lists.laptop.org/listinfo/power
On Wed, May 29, 2013 at 8:46 PM, Anna ascho...@gmail.com wrote:
On Wed,
Hi,
The setup at the Kokobe Primary school in Lesotho has a small solar
panel (too small) which attempts to charge two car batteries (deep cycle
would be better but not available).
The router (Belkin) runs directly from the battery (we cut the cable).
Linksys and other routers I have used
Tony makes an interesting point that may be new to some:
On Thu, May 30, 2013 at 06:47:26AM +0200, Tony Anderson wrote:
This discussion is relevant because 12vdc does not travel well over
long distances. It may be necessary in a school with multiple
classrooms to use an inverter to provide 110
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