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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Want to kill a battery bank? Go ahead and center tap it! I have seen this way to many times.<o:p></o:p></p><p class=MsoNormal>Lots of really efficient DC to DC converters out there.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in'><p class=MsoNormal style='border:none;padding:0in'><span style='font-family:"Century Gothic",sans-serif;color:#002060'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-family:"Century Gothic",sans-serif;color:#002060'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif'>Dana Orzel Great Solar Works, Inc. <o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif'>C - 208.721.7003 dana@solarwork.com<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif'>Idaho Contractor - # 028765 Idaho PV # 028374<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif'>NABCEP # 051112-136 <a href="http://www.solarwork.com"><span style='color:blue'>www.solarwork.com</span></a><o:p></o:p></span></p><p class=MsoNormal><u><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif'>"Responsible Technologies for Responsible People since 1988" </span></u><u><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif'><o:p></o:p></span></u></p><p class=MsoNormal style='background:white'><b><span style='font-size:18.0pt;font-family:Webdings;color:green'>P</span></b><span style='font-family:"Helvetica",sans-serif;color:navy'> </span><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:green'>Please consider the environment before printing this email.</span><span style='font-family:"Helvetica",sans-serif;color:black'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> <b>On Behalf Of </b>Dan Fink<br><b>Sent:</b> Tuesday, December 31, 2019 1:46 PM<br><b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br><b>Subject:</b> Re: [RE-wrenches] combining 24v and 12v systems<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I second everyone. Center-tapping a 24 or 48v battery bank for 12v SEEMS like it should work just fine, especially for low load infrequent use like a 12v water pressure pump for a greenhouse, a weather station, etc.. Nope, I've been a loser every time, with that battery or pair always the first to go bad.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Samlex and Victron both make DC-DC converters I have had good luck with; they are thermally protected and you can stack multiple units for more amperage.<o:p></o:p></p></div><div><p class=MsoNormal><br clear=all><o:p></o:p></p><div><div><div><div><div><div><div><div><div><div><div><div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222;border:none windowtext 1.0pt;padding:0in'>Dan Fink</span><span style='font-size:12.0pt;color:black'><o:p></o:p></span></p></div><div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222'>Executive Director, Buckville Energy Consulting<o:p></o:p></span></p></div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222'>NABCEP PV Associate<o:p></o:p></span></p></div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222'>NABCEP Certified PV System Inspector<o:p></o:p></span></p></div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222'>IREC Certified Instructor\u2122 for: <o:p></o:p></span></p></div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222'>~ PV Installation Professional<o:p></o:p></span></p></div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222'>~ Small Wind Installer<o:p></o:p></span></p></div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222'>NABCEP Registered Continuing Education Providers<o:p></o:p></span></p></div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222'><a href="mailto:dan.fink@greendustrialtraining.com" target="_blank">d</a><a href="mailto:anbob88@gmail.com" target="_blank">anbob88@gmail.com</a><o:p></o:p></span></p></div><div><p class=MsoNormal style='vertical-align:baseline'><span style='font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222'>970-672-4342<o:p></o:p></span></p></div></div><p class=MsoNormal><br> <o:p></o:p></p></div></div></div></div></div></div></div></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Tue, Dec 31, 2019 at 10:57 AM Ray <<a href="mailto:ray@solarray.com">ray@solarray.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><p>Even with battery balancers, battery tapping is still a really bad idea. I know, I did it on my own system in the 90s. The DC/DC converters are the way to go, but be sure and over size it by a fair amount to handle the fridge starting surge. Unfortunately my favorites are no longer available: made by Solar Converters in Canada. I've seen them last decades. Iota should be good stuff, their chargers have long term reliability. Samlex inverters have been around for quite a while too, but I don't have long term experience with their converters. <o:p></o:p></p><pre>Ray Walters<o:p></o:p></pre><pre>Remote Solar<o:p></o:p></pre><pre>303 505-8760<o:p></o:p></pre><div><p class=MsoNormal>On 12/31/19 10:05 AM, Dave Angelini Offgrid Solar wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p>Tapping a battery bank is not a good practice. it will unbalance the bank. Much better to add a 24V electronic converter for the 12V loads. Then replace the 12V loads when time permits. They will need a spare converter so buy 2. Amazon has tons of these converters. Your quote is great BTW. H N Y !<o:p></o:p></p><pre> <o:p></o:p></pre><pre><strong><span style='font-family:"Courier New"'>Dave Angelini Offgrid Solar<o:p></o:p></span></strong></pre><pre><strong><span style='font-family:"Courier New"'>"we go where powerlines don't"<o:p></o:p></span></strong></pre><pre><strong><span style='font-family:"Courier New"'><a href="http://members.sti.net/offgridsolar/" target="_blank">http://members.sti.net/offgridsolar/</a><o:p></o:p></span></strong></pre><pre><strong><span style='font-family:"Courier New"'>e-mail <a href="mailto:offgridsolar@sti.net" target="_blank">offgridsolar@sti.net</a><o:p></o:p></span></strong></pre><pre><strong><span style='font-family:"Courier New"'>text 209 813 0060</span></strong><o:p></o:p></pre><p>On Tue, 31 Dec 2019 11:52:20 -0500, Chris Schaefer <a href="mailto:chris@solarandwindfx.com" target="_blank"><chris@solarandwindfx.com></a> wrote:<o:p></o:p></p><blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>G'day and Happy New Year to All, <o:p></o:p></p><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Recently came across this offgrid OB FX system. The first part is a 12v battery system w/ 2 PV modules, 2 Trojan L16 batteries used to power a frig and freezer about 6 years old. The second is a 24v with 3kw of PV, 4 Trojan L16's, twin OB FX inverters installed by an HVAC contractor back in 2016. This was their first offgrid project. Oh boy, lol. The client would like to add more battery capacity to both. My thought here is since we are powering only a 12v frig and freezer why not simplify the system by creating a single battery bank and then tapping off of the 24v bank using proper fusing and creating a 12v buss? Admittedly I live in a 48v world so I'm asking our esteemed colleges as to options on how to address this. <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Oh yeah, the installer is unresponsive (no surprise there) and they are also having firmware issues with an old Mate 3 and would like me to install a new Mate 3s but that's another issue I'll tackle when I head out to site. <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Thanks All,<o:p></o:p></p></div><div><p class=MsoNormal>Christopher- <o:p></o:p></p><div><div><div><div><div><div><p align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D'>Chris Schaefer's<br></span><a href="http://www.solarandwindfx.com" target="_blank"><span style='font-size:9.5pt;border:solid windowtext 1.0pt;padding:0in;text-decoration:none'><img border=0 width=200 height=40 style='width:2.0833in;height:.4166in' id="_x0000_i1025" src="cid:image001.jpg@01D5BFF9.DADDF980" alt="Image removed by sender."></span></a><br><em><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D'>Tel/Fax 585-229-2083 or Cell 585-748-1870 </span></em><i><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D'><br></span></i><em><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D'>5115 South Hill Road ~ Canandaigua New York 14424</span></em><i><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D'><br></span></i><em><span style='font-size:10.0pt;font-family:"Calibri",sans-serif'><a href="http://www.solarandwindfx.com" target="_blank">www.solarandwindfx.com</a> ~ E-mail: <span style='color:blue'><a href="mailto:chris@solarandwindfx.com" target="_blank">chris@solarandwindfx.com</a></span></span></em><o:p></o:p></p><p align=center style='text-align:center'><i><span style='font-size:10.0pt;border:solid windowtext 1.0pt;padding:0in'><img border=0 width=200 height=56 style='width:2.0833in;height:.5833in' id="_x0000_i1026" src="cid:image002.jpg@01D5BFF9.DADDF980" alt="Image removed by sender."></span></i><o:p></o:p></p><p align=center style='text-align:center'><span style='font-size:10.0pt'>Thomas Jefferson, the author of our great Constitution, once said, "democracy" will cease to exist when you take away from those who are willing to work and give to those who would not."</span><o:p></o:p></p></div></div></div></div></div></div></div></div></blockquote><div><p class=MsoNormal>-- <o:p></o:p></p><pre> <o:p></o:p></pre></div><p class=MsoNormal><o:p> </o:p></p><pre>_______________________________________________<o:p></o:p></pre><pre>List sponsored by Redwood Alliance<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Change listserver email address & settings:<o:p></o:p></pre><pre><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" target="_blank">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List rules & etiquette:<o:p></o:p></pre><pre><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">www.re-wrenches.org/etiquette.htm</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Check out or update participant bios:<o:p></o:p></pre><pre><a href="http://www.members.re-wrenches.org" target="_blank">www.members.re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre></blockquote></div><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br><br>Change listserver email address & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" target="_blank">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org" target="_blank">www.members.re-wrenches.org</a><o:p></o:p></p></blockquote></div></div></body></html>