<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">I know this isn't Facebook, but if there were a 'like' button, I would click it. </div><div class="gmail_default" style="font-family:verdana,sans-serif">
<br></div><div class="gmail_default" style="font-family:verdana,sans-serif">This is probably a more common question than we realize, and I agree with the answer by Allan/Bob-O. I wonder if we could convince Solar Converters, Inc. to make a cost effective and flexible DC converter to boost the PV voltage and make this possible.</div>
<br><div id="WISESTAMP_SIG_gmail_session"><div style="font-size:13px;font-family:Verdana,Arial,Helvetica,sans-serif"><div style="margin:0 0 8px 0"><p style="margin:0"><span style="color:#808080"><strong>Jason Szumlanski</strong></span></p>
<p style="margin:0"><span style="color:#808080"><em>Fafco Solar<br></em></span><br></p></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jun 4, 2013 at 1:34 PM, Allan Sindelar <span dir="ltr"><<a href="mailto:allan@positiveenergysolar.com" target="_blank">allan@positiveenergysolar.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>Eric,<br>
Please explain further, as what you wrote makes no sense to me.
Mac didn't indicate whether he wanted to charge a flooded battery
(~29.2V) or sealed (~28.4V). The C-series of PWM controllers has a
fixed two-hour absorption, which it only counts down once the bulk
voltage is reached. If the bulk voltage setpoint is above the MPP
of the module, as it is in this case, how can it ever reach float,
as you suggest?<br>
<br>
And further, this is spec-sheet calculation. In all but the
coldest winter weather, the Vmp of the module will be lower still
as the module temperature rises above 25ºC, and is likely to be
even below the float voltage in hot weather. And in the winter, if
the battery is also cold, it will need a higher voltage still to
get fully charged.<br>
<br>
So I'm with Bob-O on this one. You can't charge a 24V battery with
a 20V module. Please tell us how I'm wrong.<br>
Thanks, Allan<br>
<br>
P.S. - And while I'm on a virtual roll, please tell your
engineering folks to build a charge controller with a higher
voltage input window. I don't mean 600 volts at $1,500 or whatever
it is; just higher than 150V. On a 48V system, we're stuck with
series strings of three modules if we use the lowest-cost-per-watt
60-cell modules. That means that systems have to be designed with
arrays in ~750-watt increments. Give us another 50-100V or so of
headroom, so we can design with strings in multiples of 3, 4, or
5. Outback, are you listening too? The Midnite Classic does this
for us... Thanks.<br>
<br>
<div>
<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com" target="_blank"><font color="#000099" face="Times New Roman, Times, serif"><u>Allan@positiveenergysolar.com</u></font></a></small><font face="Times New Roman, Times, serif"><br>
<span style="font-size:10pt">NABCEP Certified Photovoltaic
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder and Chief Technology Officer<br>
<b>Positive Energy, Inc.</b><br>
3209 Richards Lane (note new address)<br>
Santa Fe, New Mexico 87507<br>
<b><a href="tel:505%20424-1112" value="+15054241112" target="_blank">505 424-1112</a></b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a><u></u><u></u></span></font>
<p class="MsoNormal" style="margin-right:722.25pt"><span style="font-size:10pt"><font face="Times New Roman, Times,
serif"><u></u><u></u><u></u><u></u><u></u><u></u><u></u><u></u></font><b><br>
</b></span></p>
<span style="font-size:10pt"><br>
</span> </div><div><div class="h5">
On 6/4/2013 10:43 AM, <a href="mailto:Eric.Bentsen@schneider-electric.com" target="_blank">Eric.Bentsen@schneider-electric.com</a> wrote:<br>
</div></div></div><div><div class="h5">
<blockquote type="cite">
<br>
<font face="sans-serif">Hi Mac,</font>
<br>
<br>
<font face="sans-serif">A PWM charge controller, such as
the
C35, will work in this application, because it will </font>
<br>
<font face="sans-serif">act like a switch that connects
the
panel to the battery. While the bulk voltage will likely be
slightly</font>
<br>
<font face="sans-serif">higher than Vmp, once the
controller
transitions to float, which is approx 27V for most battery
types,</font>
<br>
<font face="sans-serif">it should allow the module to
operate
very close to Vmp. </font>
<br>
<font face="sans-serif">Typically, MPPT controllers
require
a higher Vmp than the target charge voltage.</font>
<br>
<br>
<font face="sans-serif">Eric Bentsen<br>
</font><font size="3" color="#008000">_____________________________________________________________________________________</font><font size="3">
<br>
</font><font size="1" face="Arial"><b><br>
Eric Bentsen</b> | </font><font size="1" color="#008000" face="Arial"><b>
Schneider Electric </b></font><font size="1" face="Arial"><b>
| Solar
Business</b> | <b>UNITED STATES</b> | <b>Technical
Support Representative</b> <b><br>
Phone:</b> +(650) 351-8237 ext. 001# | <b><br>
Email:</b> </font><a href="mailto:eric.bentsen@schneider-electric.com" target="_blank"><font size="1" color="blue" face="Arial"><u>eric.bentsen@schneider-electric.com</u></font></a><font size="1" face="Arial">
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www.schneider-electric.com/solar</u></font></a><font size="1" face="Arial">
| <b>Address:</b> 250 South Vasco Rd., Livermore, CA 94551
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<br>
<br>
<br>
<table width="100%">
<tbody>
<tr valign="top">
<td><font size="1" color="#5f5f5f" face="sans-serif">From:</font>
</td>
<td><font size="1" face="sans-serif">Mac Lewis
<a href="mailto:maclewis1@gmail.com" target="_blank"><maclewis1@gmail.com></a></font>
</td>
</tr>
<tr valign="top">
<td><font size="1" color="#5f5f5f" face="sans-serif">To:</font>
</td>
<td><font size="1" face="sans-serif">RE-wrenches
<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank"><re-wrenches@lists.re-wrenches.org></a></font>
</td>
</tr>
<tr valign="top">
<td><font size="1" color="#5f5f5f" face="sans-serif">Date:</font>
</td>
<td><font size="1" face="sans-serif">06/04/2013 08:05 AM</font>
</td>
</tr>
<tr valign="top">
<td><font size="1" color="#5f5f5f" face="sans-serif">Subject:</font>
</td>
<td><font size="1" face="sans-serif">[RE-wrenches] 24V
charging with 60 cell
modules</font>
</td>
</tr>
<tr valign="top">
<td><font size="1" color="#5f5f5f" face="sans-serif">Sent
by:</font>
</td>
<td><font size="1" face="sans-serif"><a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a></font></td>
</tr>
</tbody>
</table>
<br>
<hr noshade>
<br>
<br>
<br>
<font size="3">Hello wrenches,</font>
<br>
<br>
<font size="3">Is there a good method to charge 24V battery bank
with
single 60 cell modules? Ideally, I'd like to charge a 24 V bank
with
a Kyocera 245GX-LFB. However, at NOTC the Vmp is 26.8V. Any
good way to do this?</font>
<br>
<br>
<font size="3">Thanks in advance.<br>
-- </font>
<br>
<br>
<br>
<br>
<font size="3">Mac Lewis<br>
</font>
<p><font color="#37605e">"Yo solo sé que no sé nada." </font><font color="#5f5f5f">-Sócrates</font>
</p>
<p><font size="3"><br>
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