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<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'>Eric – </span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'>The minimum battery size we recommend for
AC coupled applications is about 100 amp-hours at 48VDC – roughly 4kWH at
80% DOD – this allows good motor starting performance and provides the
necessary stability for the battery-less grid-tie inverter to continue powering
loads. </span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'>Smaller batteries have been used
successfully – but they need to be either very high performance / low
impedance (such as Optima type batteries) or the loads need to be very modest
with little starting surge requirements. The cost for the smaller Optimas is
usually the same as the larger sealed AGM batteries so they do not make sense
to me to use unless the smaller / lighter benefits are needed (such as in a
portable display for example). </span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'>Let me know your specifics and I will work
up so recommendations.</span></font></p>
<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'> </span></font></p>
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<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Christopher</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Christopher Freitas</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Director of Research and Development
</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>OutBack Power Systems, Inc.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="mailto:cfreitas@outbackpower.com"><font
size=3 color=black><span style='font-size:12.0pt;color:black'>cfreitas@outbackpower.com</span></font></a></span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Tel 360 435 6030</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Cell 360 202 4239</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><font color=navy><span style='color:navy'>19009 62<sup>nd</sup>
Ave NE</span></font><font color=navy><span style='color:navy'> </span></font></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><font color=navy><span style='color:navy'>Arlington</span></font><font
color=navy><span style='color:navy'> </span></font><font color=navy><span
style='color:navy'>WA</span></font><font color=navy><span style='color:navy'> </span></font><font
color=navy><span style='color:navy'>98223</span></font><font color=navy><span
style='color:navy'> </span></font><font color=navy><span style='color:navy'>USA</span></font></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="http://www.outbackpower.com/"><font
size=3 color=black><span style='font-size:12.0pt;color:black'>www.outbackpower.com</span></font></a></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
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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>Eric Andrews<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, November 04, 2008
10:56 PM<br>
<b><span style='font-weight:bold'>To:</span></b>
RE-wrenches@lists.re-wrenches.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [RE-wrenches] AC coupling</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color="#c00000" face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:#C00000'>Fellow PV Techies
–</span></font></p>
<p class=MsoNormal><font size=2 color="#c00000" face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:#C00000'> </span></font></p>
<p class=MsoNormal><font size=2 color="#c00000" face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:#C00000'>When designing an AC
coupled PV system using Outback: Am I correct that the battery bank can be
minimally small, as they are just there to power the GVFX Output and mimic the
grid for the grid-tied inverter of choice?</span></font></p>
<p class=MsoNormal><font size=2 color="#c00000" face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:#C00000'> </span></font></p>
<p class=MsoNormal><font size=2 color="#c00000" face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:#C00000'>Thanks,</span></font></p>
<p class=MsoNormal><font size=2 color="#c00000" face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:#C00000'> </span></font></p>
<div>
<p class=MsoNormal><font size=3 color="#c00000" face=Arial><span
style='font-size:12.0pt;font-family:Arial;color:#C00000'>Eric R. Andrews</span></font></p>
<p class=MsoNormal><font size=1 color=black face="Arial Rounded MT Bold"><span
style='font-size:8.0pt;font-family:"Arial Rounded MT Bold";color:black'>NABCEP
Certified PV Installer</span></font></p>
<p class=MsoNormal><font size=5 color="#c00000" face="Bauhaus 93"><span
style='font-size:16.0pt;font-family:"Bauhaus 93";color:#C00000'>Eco Solar, Inc.</span></font></p>
<p class=MsoNormal><font size=1 color="#c00000" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#C00000'>Klamath Falls, OR 97601</span></font></p>
<p class=MsoNormal><font size=1 color="#c00000" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#C00000'> </span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:11.0pt;
font-family:Arial'> </span></font></p>
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