[RE-wrenches] Magnum MM1524AE rebuild?

Mon Jun 14 11:53:06 EDT 2021

Hi Drake,

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.

I used a 25 Ohm 50 watt resistor.this one 
<https://www.amazon.com/YiePhiot-Resistor-Aluminum-Wirewound-Doorbell/dp/B07MW4VHDB/ref=sr_1_13?dchild=1&keywords=YiePhiot&qid=1623685581&sr=8-13>

and this nice metal screw-terminal momentary on-off switch this one 
<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>

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.

Hope that helps!

Best,

Jeff

> drake.chamberlin at redwoodalliance.org 
> <mailto:drake.chamberlin at redwoodalliance.org>
> June 11, 2021 at 12:27 PM
>
>
> Hello Jeff,
>
> That sounds really useful. How do you wire this? Where do you get the 
> momentary switch?
>
> Thanks,
>
> Drake
>
> ---
>
>
> On 2021-06-09 12:13, Jeff Clearwater wrote:
>
>>> Hey Dave and Wrenches,
>>>
>>> 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.
>>>
>>> Best,
>>>
>>> Jeff Clearwater
>>> Village Power Design
>>>
>>>
>>>     palumbo131m at gmail.com <mailto:palumbo131m at gmail.com>
>>>     June 8, 2021 at 6:01 AM
>>>
>>     Is a Magnum MM1524AE inverter/charger repairable and if so by whom?
>>
>>     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.
>>
>>     Dave Palumbo
>>
>>     Hyde Park, VT
>>
>>
>>
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> Jeff Clearwater <mailto:jeffc at villagepowerdesign.com>
> June 9, 2021 at 9:13 AM
> Hey Dave and Wrenches,
>
> 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.
>
> Best,
>
> Jeff Clearwater
> Village Power Design
>
>
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
>
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>
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> Jeff Clearwater <mailto:jeffc at villagelab.net>
> June 9, 2021 at 9:12 AM
> Hey Dave and Wrenches,
>
> 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.
>
> Best,
>
> Jeff Clearwater
> Village Power Design
>
>
>
> palumbo131m at gmail.com <mailto:palumbo131m at gmail.com>
> June 8, 2021 at 6:01 AM
>
> Is a Magnum MM1524AE inverter/charger repairable and if so by whom?
>
> 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.
>
> Dave Palumbo
>
> Hyde Park, VT
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
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