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<DIV><SPAN class=406283204-18032013><FONT face=Arial color=#0000ff size=2>I
think there are several ways of doing this. </FONT></SPAN></DIV>
<DIV><SPAN class=406283204-18032013><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=406283204-18032013><FONT face=Arial color=#0000ff size=2>I'm
sure I saw a universal 12v laptop charger only a few days ago. I assume it
has a step-up system to supply the 19v which is more or less the norm these
days..</FONT></SPAN></DIV>
<DIV><SPAN class=406283204-18032013><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=406283204-18032013><FONT face=Arial color=#0000ff size=2>A
colleague used to write a lot of macros for the CAD I use. They were
all written on the (long) train trip to town and he used to carry a 12v
motorbike battery for the power. That was in the days of 12v power and he only
needed to ensure that the laptop had a standard coaxial jack, so he could
cobble his own cable. This approach is just as valid today - you just need the
extra volts. A set of deep cycle wet cells might weigh a ton but you aren't
going to waml around with them and the will deliver more power than you could
dream of with a laptop battery.</FONT></SPAN></DIV>
<DIV><SPAN class=406283204-18032013><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=406283204-18032013><FONT face=Arial color=#0000ff size=2>I
understand a lot of the money in a UPS is to pay for the U. This is
irrelevant when using a laptop except when the battery is utterly dead, or
missing. </FONT></SPAN></DIV>
<DIV><SPAN class=406283204-18032013><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=406283204-18032013><FONT face=Arial color=#0000ff size=2>While
using an inverter to go DC-AC-DC seems dumb, it may be the simplest way of going
about it, if only to expedite the transition from 12v to 19v. They are getting
cheaper every day and I believe the DC input sockets one sees on laptops imply a
pulsed DC supply is kosher. </FONT></SPAN><SPAN
class=406283204-18032013><FONT face=Arial color=#0000ff
size=2> </FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV><FONT face=Arial
color=#0000ff size=2></FONT><BR>
<P><FONT size=2>Nick Pyner<BR><BR>Dee Why NSW </FONT></P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Greenbuilding
[mailto:greenbuilding-bounces@lists.bioenergylists.org]<B>On Behalf Of </B>Eli
Talking<BR><B>Sent:</B> Monday, 18 March 2013 2:07 PM<BR><B>To:</B> Green
Building<BR><B>Subject:</B> [Greenbuilding] DC stored power for Laptoops for
grid outages<BR><BR></FONT></DIV>
<DIV dir=ltr>
<DIV style="FONT-SIZE: 14pt; COLOR: #000000; FONT-FAMILY: 'Times New Roman'">
<DIV><FONT size=4>In this last year we had two multi day power
outages. </FONT></DIV></DIV></DIV></BLOCKQUOTE></BODY></HTML>