<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
color:black;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
p.v1msonormal1, li.v1msonormal1, div.v1msonormal1
{mso-style-name:v1msonormal1;
margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
color:black;}
span.EmailStyle29
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='color:windowtext'>I have had success with putting together either (3, for 24 v systems) or (6, for 48 v systems) 9 V Duracell batteries to jump start off grid OutBack systems when their battery banks have been unattended for too long, last one sat for a year & a half due to the covid before the owners got back into their remote cabin. The 24 v battery bank measured ~ 4 volts. I was able to re-awaken the OB MX60 and FX2524 long enough to have the solar kick in and start charging the system, keeping the inverter on long enough to get a gen set to engage recharging. <o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>What is the thought on using 9 v batteries to bring up the caps on the Magnum\u2019s during initial startup? <o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='color:windowtext'>Chris Worcester<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Solar Wind Works<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>NABCEP PV Installation Professional<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Cell 530-448-9692<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>www.solarwindworks.com<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>chris@solarwindworks.com<o:p></o:p></span></p></div><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='color:windowtext'>From:</span></b><span style='color:windowtext'> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> <b>On Behalf Of </b>Jeff Clearwater<br><b>Sent:</b> Monday, June 14, 2021 9:01 AM<br><b>To:</b> drake.chamberlin@redwoodalliance.org<br><b>Cc:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br><b>Subject:</b> Re: [RE-wrenches] Magnum MM1524AE rebuild?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>oh and of course I put an inline fuse in the circuit.<br><br>The current that flows of course will be dependent on battery voltage and resistor ohms. So with a 48 VDC pack you could go up in resistance - just figure per ohm - volt - amp formulas/calculator <a href="http://www.sengpielaudio.com/calculator-ohm.htm"> here.</a><br><br>With less than 5 amps - you'll get a nice ramp up fill of your caps on most inverters we use in the industry.<br><br>Hope that helps!<br><br>Jeff Clearwater<br>Village Power Design<br><br><o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div style='margin-left:18.75pt;margin-top:22.5pt;margin-right:18.75pt;margin-bottom:7.5pt'><div style='border:none;border-top:solid #EDF1F4 1.5pt;padding:8.0pt 0in 0in 0in'><div><p class=MsoNormal style='vertical-align:middle'><a href="mailto:jeffc@villagepowerdesign.com">Jeff Clearwater</a><o:p></o:p></p></div><p class=MsoNormal align=right style='text-align:right;vertical-align:middle'><span style='color:#909AA4'>June 14, 2021 at 8:53 AM</span><o:p></o:p></p></div></div><div style='margin-left:.25in;margin-right:.25in'><p class=MsoNormal><span style='color:#909AA4'>Hi Drake,<br><br>So it's simply a momentary bypass circuit from the Load side to the Line side of your Main Inverter Breaker. So from battery side of inverter to momentary on-off switch to resistor to inverter side of breaker.<br><br>I used a 25 Ohm 50 watt resistor.<a href="https://www.amazon.com/YiePhiot-Resistor-Aluminum-Wirewound-Doorbell/dp/B07MW4VHDB/ref=sr_1_13?dchild=1&keywords=YiePhiot&qid=1623685581&sr=8-13"> this one</a><br><br>and this nice metal screw-terminal momentary on-off switch <a href="https://www.amazon.com/Momentary-Waterproof-Stainless-Terminal-warranty/dp/B079HR5Q4R/ref=pd_sbs_1/142-3113942-9020237?pd_rd_w=dHOiq&pf_rd_p=a5925d26-9630-40f3-a011-d858608ac88b&pf_rd_r=WSD3157P3TEAB0M4Z6PR&pd_rd_r=ab809190-b332-4f06-952b-369bf1c6a51c&pd_rd_wg=qD1Vl&pd_rd_i=B079HR5Q4R&psc=1">this one</a><br><br>With a Magnum MS4024 PAE on a 10 KWH LiFePO4 pack - when I push the switch initially about 2 amps flows - I've found I need to hold it for about 8 seconds for the current to drop off to about .4 amps - then when I flip the 175 AMP main DC inverter breaker - there is little additional current that flows into the inverter caps - no sparks and my BMS doesn't shut down due to overcurrent fault.<br><br>Hope that helps!<br><br>Best,<br><br>Jeff<br><br><br><br><br><o:p></o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='color:#909AA4'>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>Pay optional member dues here: <a href="http://re-wrenches.org">http://re-wrenches.org</a><br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">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">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>There are two list archives for searching. When one doesn't work, try the other:<br><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm">http://www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org">http://www.members.re-wrenches.org</a><o:p></o:p></span></p></div></div><div style='margin-left:18.75pt;margin-top:22.5pt;margin-right:18.75pt;margin-bottom:7.5pt'><div style='border:none;border-top:solid #EDF1F4 1.5pt;padding:8.0pt 0in 0in 0in'><div><p class=MsoNormal style='vertical-align:middle'><a href="mailto:drake.chamberlin@redwoodalliance.org">drake.chamberlin@redwoodalliance.org</a><o:p></o:p></p></div><p class=MsoNormal align=right style='text-align:right;vertical-align:middle'><span style='color:#909AA4'>June 11, 2021 at 12:27 PM</span><o:p></o:p></p></div></div><div style='margin-left:.25in;margin-right:.25in'><p><span style='color:#909AA4'><o:p> </o:p></span></p><p><span style='color:#909AA4'>Hello Jeff,<o:p></o:p></span></p><p><span style='color:#909AA4'>That sounds really useful. How do you wire this? Where do you get the momentary switch?<o:p></o:p></span></p><p><span style='color:#909AA4'>Thanks,<o:p></o:p></span></p><p><span style='color:#909AA4'>Drake<o:p></o:p></span></p><div id=signature><p class=MsoNormal><span style='color:#909AA4'>---<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-family:"Courier New";color:#909AA4'> <o:p></o:p></span></p></div></div><p><span style='color:#909AA4'><o:p> </o:p></span></p><p id=reply-intro><span style='color:#909AA4'>On 2021-06-09 12:13, Jeff Clearwater wrote:<o:p></o:p></span></p><blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 5.0pt;margin-left:0in;margin-right:0in'><blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 5.0pt;margin-left:0in;margin-right:0in'><div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'>Hey Dave and Wrenches,<br><br>This is why now I always install a pre-charge circuit for Magnum's and other inverters - especially on a Lithium pack with a BMS. A momentary on-off switch and 50 watt 20 ohm resistor - $20 worth of parts = a lifetime of less stress on main breaker - inverter caps and battery BMS. I recommend it for any inverter over 2 KW. Many LiFePO4 BMS's will shut down when sensing that much inrush so it's a must on many systems.<br><br>Best,<br><br>Jeff Clearwater<br>Village Power Design<br><br><o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div style='margin-left:18.75pt;margin-top:22.5pt;margin-right:18.75pt;margin-bottom:7.5pt'><div style='border:none;border-top:solid #EDF1F4 1.5pt;padding:8.0pt 0in 0in 0in'><div><p class=MsoNormal style='background:white;vertical-align:middle'><a href="mailto:palumbo131m@gmail.com">palumbo131m@gmail.com</a><o:p></o:p></p></div><p class=MsoNormal align=right style='text-align:right;background:white;vertical-align:middle'><span style='color:#909AA4'>June 8, 2021 at 6:01 AM</span><o:p></o:p></p></div></div><div style='margin-left:.25in;margin-right:.25in'><p class=MsoNormal style='background:white'><span style='color:#909AA4'> <o:p></o:p></span></p></div></blockquote></div></div></blockquote></blockquote><blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 5.0pt;margin-left:0in;margin-right:0in'><div id=replybody1><div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div style='margin-left:.25in;margin-right:.25in'><p class=v1msonormal1 style='background:white'><span style='color:#909AA4'>Is a Magnum MM1524AE inverter/charger repairable and if so by whom?<o:p></o:p></span></p><p class=v1msonormal1 style='background:white'><span style='color:#909AA4'>It failed after being reconnected to a battery bank, the typical small spark at the battery terminal when being reconnected was accompanied by a popping sound in the Magnum. Killed the Magnum.<o:p></o:p></span></p><p class=v1msonormal1 style='background:white'><span style='color:#909AA4'> <o:p></o:p></span></p><p class=v1msonormal1 style='background:white'><span style='color:#909AA4'>Dave Palumbo<o:p></o:p></span></p><p class=v1msonormal1 style='background:white'><span style='color:#909AA4'>Hyde Park, VT<o:p></o:p></span></p><p class=MsoNormal style='background:white'><span style='color:#909AA4'><br><br><o:p></o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='color:#909AA4'>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>Pay optional member dues here: <a href="http://re-wrenches.org" target="_blank">http://re-wrenches.org</a><br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">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>There are two list archives for searching. When one doesn't work, try the other:<br><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">http://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">http://www.members.re-wrenches.org</a><o:p></o:p></span></p></div></div></blockquote></div></div><p class=MsoNormal><span style='color:#909AA4'><o:p> </o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-family:"Courier New";color:#909AA4'>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>Pay optional member dues here: <a href="http://re-wrenches.org" target="_blank">http://re-wrenches.org</a><br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">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>There are two list archives for searching. When one doesn't work, try the other:<br><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">http://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">http://www.members.re-wrenches.org</a><o:p></o:p></span></p></div></blockquote></div><div style='margin-left:18.75pt;margin-top:22.5pt;margin-right:18.75pt;margin-bottom:7.5pt'><div style='border:none;border-top:solid #EDF1F4 1.5pt;padding:8.0pt 0in 0in 0in'><div><p class=MsoNormal style='vertical-align:middle'><a href="mailto:jeffc@villagepowerdesign.com">Jeff Clearwater</a><o:p></o:p></p></div><p class=MsoNormal align=right style='text-align:right;vertical-align:middle'><span style='color:#909AA4'>June 9, 2021 at 9:13 AM</span><o:p></o:p></p></div></div><div style='margin-left:.25in;margin-right:.25in'><p class=MsoNormal><span style='color:#909AA4'>Hey Dave and Wrenches,<br><br>This is why now I always install a pre-charge circuit for Magnum's and other inverters - especially on a Lithium pack with a BMS. A momentary on-off switch and 50 watt 20 ohm resistor - $20 worth of parts = a lifetime of less stress on main breaker - inverter caps and battery BMS. I recommend it for any inverter over 2 KW. Many LiFePO4 BMS's will shut down when sensing that much inrush so it's a must on many systems.<br><br>Best,<br><br>Jeff Clearwater<br>Village Power Design<br><br><br><br><br><br><o:p></o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='color:#909AA4'>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>Pay optional member dues here: <a href="http://re-wrenches.org">http://re-wrenches.org</a><br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">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">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>There are two list archives for searching. When one doesn't work, try the other:<br><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm">http://www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org">http://www.members.re-wrenches.org</a><o:p></o:p></span></p></div></div><div style='margin-left:18.75pt;margin-top:22.5pt;margin-right:18.75pt;margin-bottom:7.5pt'><div style='border:none;border-top:solid #EDF1F4 1.5pt;padding:8.0pt 0in 0in 0in'><div><p class=MsoNormal style='vertical-align:middle'><a href="mailto:jeffc@villagelab.net">Jeff Clearwater</a><o:p></o:p></p></div><p class=MsoNormal align=right style='text-align:right;vertical-align:middle'><span style='color:#909AA4'>June 9, 2021 at 9:12 AM</span><o:p></o:p></p></div></div><div style='margin-left:.25in;margin-right:.25in'><p class=MsoNormal style='margin-bottom:12.0pt'><span style='color:#909AA4'>Hey Dave and Wrenches,<br><br>This is why now I always install a pre-charge circuit for Magnum's and other inverters - especially on a Lithium pack with a BMS. A momentary on-off switch and 50 watt 20 ohm resistor - $20 worth of parts = a lifetime of less stress on main breaker - inverter caps and battery BMS. I recommend it for any inverter over 2 KW. Many LiFePO4 BMS's will shut down when sensing that much inrush so it's a must on many systems.<br><br>Best,<br><br>Jeff Clearwater<br>Village Power Design<br><br><br><o:p></o:p></span></p></div><div style='margin-left:18.75pt;margin-top:22.5pt;margin-right:18.75pt;margin-bottom:7.5pt'><div style='border:none;border-top:solid #EDF1F4 1.5pt;padding:8.0pt 0in 0in 0in'><div><p class=MsoNormal style='vertical-align:middle'><a href="mailto:palumbo131m@gmail.com">palumbo131m@gmail.com</a><o:p></o:p></p></div><p class=MsoNormal align=right style='text-align:right;vertical-align:middle'><span style='color:#909AA4'>June 8, 2021 at 6:01 AM</span><o:p></o:p></p></div></div><div style='margin-left:.25in;margin-right:.25in'><p class=MsoNormal><span style='color:#909AA4'>Is a Magnum MM1524AE inverter/charger repairable and if so by whom? <o:p></o:p></span></p><p class=MsoNormal><span style='color:#909AA4'>It failed after being reconnected to a battery bank, the typical small spark at the battery terminal when being reconnected was accompanied by a popping sound in the Magnum. Killed the Magnum.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#909AA4'> <o:p></o:p></span></p><p class=MsoNormal><span style='color:#909AA4'>Dave Palumbo<o:p></o:p></span></p><p class=MsoNormal><span style='color:#909AA4'>Hyde Park, VT <o:p></o:p></span></p><p class=MsoNormal><span style='color:#909AA4'><br><br><o:p></o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='color:#909AA4'>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>Pay optional member dues here: <a href="http://re-wrenches.org">http://re-wrenches.org</a><br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">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">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>There are two list archives for searching. When one doesn't work, try the other:<br><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm">http://www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org">http://www.members.re-wrenches.org</a><o:p></o:p></span></p></div></div></blockquote><p class=MsoNormal><o:p> </o:p></p></div></body></html>