oh and of course I put an inline fuse in the circuit.
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 here.
<http://www.sengpielaudio.com/calculator-ohm.htm>
With less than 5 amps - you'll get a nice ramp up fill of your caps on
most inverters we use in the industry.
Hope that helps!
Jeff Clearwater
Village Power Design
Jeff Clearwater <mailto:je...@villagepowerdesign.com>
June 14, 2021 at 8:53 AM
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
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drake.chamber...@redwoodalliance.org
<mailto:drake.chamber...@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
palumbo1...@gmail.com <mailto:palumbo1...@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:je...@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
_______________________________________________
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Jeff Clearwater <mailto:je...@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
palumbo1...@gmail.com <mailto:palumbo1...@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
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