<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head><body bgcolor="#FFFFFF" text="#000000">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>
<span>
</span><br>
<blockquote type="cite"
cite="mid:6bda0449fbf9a0030bc827a0b91a578c@redwoodalliance.org"
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style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
right;"> <font color="#909AA4"><span style="padding-left:6px">June
11, 2021 at 12:27 PM</span></font></div> </div></div>
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<p><br></p>
<p>Hello Jeff,</p>
<p>That sounds really useful. How do you wire this? Where do you get the
momentary switch?</p>
<p>Thanks,</p>
<p>Drake</p>
<div id="signature">---<br>
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<p id="reply-intro">On 2021-06-09 12:13, Jeff Clearwater wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff
2px solid; margin: 0"><blockquote type="cite" style="padding: 0 0.4em;
border-left: #1010ff 2px solid; margin: 0"><div>
<div style="color: #000000; background-color: #ffffff;">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><span></span><br>
<blockquote style="border: 0px none ! important;"><div
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6px; font-weight: 500; text-decoration: none !important;"
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<div style="display: inline-block; white-space: nowrap; vertical-align:
middle; width: 48%; text-align: right;"><span style="color: #909aa4;"><span
style="padding-left: 6px;">June 8, 2021 at 6:01 AM</span></span></div>
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<div class="v1WordSection1">
<p class="v1MsoNormal">Is a Magnum MM1524AE inverter/charger repairable
and if so by whom?</p>
<p class="v1MsoNormal">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.</p>
<p class="v1MsoNormal"> </p>
<p class="v1MsoNormal">Dave Palumbo</p>
<p class="v1MsoNormal">Hyde Park, VT</p>
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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>
<span></span><br>
<br>
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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>
<span></span><br>
<br>
</div>
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<div
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class="MsoNormal">Is a Magnum MM1524AE inverter/charger repairable and
if so by whom? <o:p></o:p></p><p class="MsoNormal">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></p><p class="MsoNormal"><o:p> </o:p></p><p
class="MsoNormal">Dave Palumbo<o:p></o:p></p><p class="MsoNormal">Hyde
Park, VT <o:p></o:p></p></div>
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