<div>Mark, you may wish to contact the engineers at Maxwell to see about adding some ultracapacitors to a small battery bank. The caps would "charge up" during idle times and be there to provide the kick when the item starts up. Here's a link: <a href="http://www.maxwell.com/ultracapacitors/">http://www.maxwell.com/ultracapacitors/</a></div>
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<div>The capacitors cannot replace the battery bank but would add a lot of surge ability. Be sure to report back on the List so we can see your results and learn together. </div>
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<div>Thinking lower tech...if the high surge item is a pump perhaps the same mfr. offers a soft start package. OR: there are some aftermarket soft start controllers in the well industry that may help.</div>
<div><br clear="all">Mick Abraham, Proprietor<br><a href="http://www.abrahamsolar.com">www.abrahamsolar.com</a><br><br>Voice: 970-731-4675<br><br><br></div>
<div class="gmail_quote">On Thu, Mar 18, 2010 at 4:41 AM, Warren Lauzon <span dir="ltr"><<a href="mailto:windsun@wind-sun.com">windsun@wind-sun.com</a>></span> wrote:<br>
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<div><font size="2" face="Calibri">The kicker is the large startup, so you may need to use batteries with low internal resistance, such as the Concorde AGM's. You will also have to make sure your cables are good for the max current to avoid any voltage drop which would cause a low voltage shutdown.</font></div>
<div><font size="2" face="Calibri"></font> </div>
<div><font size="2" face="Calibri">Aside from that, just go with around 200-250 AH of battery storage (assuming 12 volts). A pair of golf car size batteries would probably work if they are something like Crown or Trojan.</font></div>
<div><font size="2" face="Calibri"></font> </div>
<div>..................................................................................................<br>Northern Arizona Wind & Sun - Electricity From The Sun Since 1979<br>Solar Discussion Forum: <a href="http://www.wind-sun.com/ForumVB/" target="_blank">http://www.wind-sun.com/ForumVB/</a><br>
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<div style="FONT: 10pt arial">----- Original Message ----- </div>
<div style="FONT: 10pt arial; BACKGROUND: #e4e4e4"><b>From:</b> <a title="Mark@OasisMontana.com" href="mailto:Mark@OasisMontana.com" target="_blank">Mark Dickson</a> </div>
<div style="FONT: 10pt arial"><b>To:</b> <a title="re-wrenches@lists.re-wrenches.org" href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">'RE-wrenches'</a> </div>
<div style="FONT: 10pt arial"><b>Sent:</b> Wednesday, March 17, 2010 2:56 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> [RE-wrenches] Small Wh and large LRA</div>
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<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Hello Wrenches, </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">I’ve been asked to design a battery based PV system for a load that has a high start up surge of about 62A @ 115V. The thing is, once it is running it will only run for ~10 minutes per day at 11A. So the daily loads are very low. How do I size a battery bank large enough to handle the large start-up surge, yet reasonable enough to cover the modest daily load? Is there a rule-of-thumb for this?</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
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<p><font color="navy" size="2" face="Comic Sans MS"><span style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt">Best regards,</span></font></p>
<p><font color="navy" size="2" face="Comic Sans MS"><span style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p><font color="navy" size="2" face="Comic Sans MS"><span style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt">Mark </span></font><font color="navy" size="2" face="Comic Sans MS"><span style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt">Dickson,</span></font><font color="navy"><span style="COLOR: navy"></span></font></p>
<p><font color="navy" size="2" face="ArialMT"><span style="FONT-FAMILY: ArialMT; COLOR: navy; FONT-SIZE: 10pt">NABCEP Certified Solar PV Installer ™</span></font></p>
<p><font color="navy" size="2" face="Comic Sans MS"><span style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 10pt">Oasis Montana Inc.</span></font></p></div></div></div></div>
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