<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">I have never seen the exam but I have been told several of the questions are nonsense. Just like the study guide, and from what I hear there are questions of similar nature on the installers exam. Something is wrong with the test generation. <br>Darryl<br><br>--- On <b>Sat, 3/27/10, Warren Lauzon <i><windsun@wind-sun.com></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Warren Lauzon <windsun@wind-sun.com><br>Subject: Re: [RE-wrenches] PV excellent battery charger<br>To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org><br>Date: Saturday, March 27, 2010, 10:55 AM<br><br><div id="yiv759174826">
<style></style>
<div><font face="Calibri" size="2">To be honest, I don't think the question makes
any sense. There are several "right" answers, but no good ones. I hope that is
not the extent of the battery questions on that exam.</font></div>
<div><font face="Calibri" size="2"></font> </div>
<div>..................................................................................................<br>Northern
Arizona Wind & Sun - Electricity From The Sun Since 1979<br>Solar Discussion
Forum: <a rel="nofollow" target="_blank" href="http://www.wind-sun.com/ForumVB/">http://www.wind-sun.com/ForumVB/</a><br>..................................................................................................</div>
<blockquote style="border-left: 2px solid rgb(0, 0, 0); padding-left: 5px; padding-right: 0px; margin-left: 5px; margin-right: 0px;">
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">----- Original Message ----- </div>
<div style="background: rgb(228, 228, 228) none repeat scroll 0%; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;"><b>From:</b>
<a rel="nofollow" title="drake.chamberlin@redwoodalliance.org" ymailto="mailto:drake.chamberlin@redwoodalliance.org" target="_blank" href="/mc/compose?to=drake.chamberlin@redwoodalliance.org">Drake Chamberlin</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>To:</b> <a rel="nofollow" title="re-wrenches@lists.re-wrenches.org" ymailto="mailto:re-wrenches@lists.re-wrenches.org" target="_blank" href="/mc/compose?to=re-wrenches@lists.re-wrenches.org">RE-wrenches</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b> Saturday, March 27, 2010 9:28
AM</div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Subject:</b> Re: [RE-wrenches] PV excellent
battery charger</div>
<div><br></div>Hi Dave, <br><br>At 10:44 AM 3/26/2010, you wrote:<br>
<blockquote class="cite" cite="" type="cite">Is the answer here (at least the
one that NABCEP intends) just that the VMP of a "12V module" is higher than
the voltage of a 12V battery? With the higher voltage it will charge the
battery with its corresponding current based on the I-V curve. The objective
reads "Explain why PV modules make excellent battery chargers based on their
I-V characteristics</blockquote><br><br>This may be the answer they
want. The "Objectives" deals with the 5 key points on the IV curve, Vmp,
Imp, Voc, Isc and Pmp. >From a study of the curve, the obvious
"excellent" load is one that takes power from Pmp, which direct battery
charging doesn't do. When I draw the curve, the Vmp of the module is
above the resulting voltage on the curve. <br><br>What you say about the
power loss not being released as heat in the batteries, just not
produced, makes sense to me. I've never seen any real documentation
about what happens to the power not gained in a non MPPT battery charging
system. <br><br>We can definitely agree that "excellent battery charger" is an
exaggeration. <br><br>Thanks,<br><br>Drake <br><br>
<p><font color="#0000ff">Drake Chamberlin<br>Athens Electric<br>OH
License 44810<br>CO License 3773<br>NABCEP </font><font color="#0000ff" size="1">TM </font><font color="#0000ff">Certified PV Installer <br>Office -
740-448-7328<br>Mobile - 740-856-9648 </font>
</p><p>
</p><hr>
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