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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I don’t have time to do the exact math
but think a small inverter and linear fluorescent is a clear winner of your
trying to adequately light the bulk of the class room.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Linear fluorescent has lumens per watt in
the upper 80’s. CFL (DC or AC) is upper 40’s and LED is the
same as CFL and maybe a little worse depending on whose products you are
comparing. You’ll also note that it’s next to impossible to
get Lumens per Watt specs from LED suppliers. It’s like the new car
company refusing to publish a MPG spec but readily waves a made up spec that
alludes to MPG but isn’t really. I’ve been asking the
numerous LED manufactures that call on me for samples so I can do side by side
testing with CF and LF and NONE of them call back a 2<sup>nd</sup> time so I’m
really still quite nervous about LED for “real” applications. Ok
sorry about that LED rant….LED’s are cool they are not the panacea
they are being made out to be,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Two evenly spaced fixtures that use a single
4’ tube will almost adequately light the entire room of that size and use
about 60 watts total. Total Lumens would be ~5400. Assuming the
tare and efficiency losses put the Morningstar 300 at net efficiency of approx
85% that take our lumens per watt to something in the mid 70’s which is
still much better then DC LED and DC CFL.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Best, Travis Creswell<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ozark Energy Services<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<hr size=2 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Walt Ratterman<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, August 17, 2009 5:34
PM<br>
<b><span style='font-weight:bold'>To:</span></b> '<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>'<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] Solar 12 volt DC lighting for school in
<st1:country-region w:st="on"><st1:place w:st="on">Haiti</st1:place></st1:country-region></span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Hello Lee,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Walt here.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>I will be leaving
for <st1:country-region w:st="on"><st1:place w:st="on">Haiti</st1:place></st1:country-region>
in about a week, and be there for three….<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>We have done lots of
schools. If you are strictly 12V, your choices primarily are 12V CF and
LED lights. There are lots of pros and cons to both.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>The real question is
what you intend to use the lights for.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>If you go to our
photo gallery (link from home page: <a href="http://www.sunepi.org">www.sunepi.org</a>
), and check out the Sierra Leone gallery, you will see some clamp-on LED
Lights that are 12V and are used for night time studying. They are pretty much
task lights and are low level. If you are trying to keep the system
really small in terms of watts of solar panels, (and cost) these can be great,
but again – the primary question is what will the light be used for.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>A step up from that
would be the 12V CFL’s. Might be tough to get in <st1:country-region
w:st="on"><st1:place w:st="on">Haiti</st1:place></st1:country-region> (for
replacements). I can check next week and let you know.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>If you have any kind
of distances involved, you will probably want to consider an inverter
(Morningstar SS-300 is great) to avoid the losses associated with 12V dc
wiring.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Feel free to contact
me off line if you want to go over this some more….<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Walt<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Lee Bristol<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, August 17, 2009 2:53
PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">RE-wrenches</st1:PersonName>@lists.re-wrenches.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>]
Solar 12 volt DC lighting for school in <st1:country-region w:st="on"><st1:place
w:st="on">Haiti</st1:place></st1:country-region><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Can anyone recommend lights for a school in <st1:country-region w:st="on"><st1:place
w:st="on">Haiti</st1:place></st1:country-region>. I am going there in a
couple of months to install a 12 volt solar PV system and need to illuminate
seven 16 x 20 foot school rooms. I am so confused by all of the light
bulb options, base options, CFL vs LED, what wattage is required, etc. I
would expect that two fixtures with bulbs would suffice for a room. Any
ideas?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>There is no grid power available…this is really out in the
boondocks.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Lee<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>-- <br>
Lee Bristol<br>
NABCEP Certified Solar Designer/Installer<br>
<br>
Chief Technology Officer<br>
Standard Solar, Inc.<br>
<st1:Street w:st="on"><st1:address w:st="on">202 Perry Parkway, #7</st1:address></st1:Street><br>
<st1:place w:st="on"><st1:City w:st="on">Gaithersburg</st1:City>, <st1:State
w:st="on">MD</st1:State> <st1:PostalCode w:st="on">20877</st1:PostalCode></st1:place><br>
(301) 944-5105<br>
(240) 479-1510 (c)<br>
<a href="http://www.standardsolar.com">www.standardsolar.com</a><o:p></o:p></span></font></p>
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