Conext SW 4024 Split Phase inverter Buzz

lincodlincod Registered Users Posts: 1
Hello, I just installed a Conext 4024 Split Phase inverter. When I turned it on I was immediately surprised by the buzzing sound. The sound is separate from the fan. It starts as soon as I start the inverter and does not stop. It sounds like transformer buzz but it’s quite loud. How much buzz is normal? The unit is installed near my living room and the constant sound will drive us crazy. I’ve used many inverters before (though not as powerful as this one) but never had this issue. Seems like Schneider could have mentioned this in the manual. Anyone else have this problem?


  • mcgivormcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    They do have a large transformer which will buzz at the 60 Hz frequency, depending on what it is mounted to will have an effect on amplification, mine is mounted to concrete wall on the other side of where I'm sitting and only when it's absolutely silent can I hear it, could of course be my hearing, were have you mounted it? hopefully not on an interior wall.

    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
  • mike95490mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    Some buzz is expected. It will become louder as loads increase.  Is there a db spec in the literature you can measure your unit against ?
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
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    gen: ,

  • RCinFLARCinFLA Solar Expert Posts: 1,479 ✭✭✭✭
    edited January 2021 #4
    There are several things that can aggrevate extra buzz.

    These LF inverters have extra gap in main transformer core to increase leakage inductance.  The extra leakage inductance creates an increase in equivalent series inductance that, in parallel with an output shunt capacitor, helps in filtering the PWM into a cleaner sinewave output.  This leakage inductance can couple its magnetic field into nearby components causing a buzz if they are not securely mounted.  Sometimes there is a glob of RTV adhesive on nearby components to keep them from buzzing.

    Another common cause of buzz is DC battery cables in close proximity to metal boxes with loose covers, like a DC circuit breaker box.  The battery cables create a strong 120 Hz magnetic field that can rattle metal components.  Taping battery lines together helps cancel out their fields and reduces their influence on nearby metal objects.  It also reduces their series inductance which reduces ripple voltage on inverter DC input which is hard on inverter DC input electrolytic filter capacitors.
  • Dave AngeliniDave Angelini Solar Expert Posts: 6,387 ✭✭✭✭✭
    Take a picture of your installation and post it !
    "we go where power lines don't" Sierra Nevada mountain area
    E-mail [email protected]

  • offgridcabin2015offgridcabin2015 Registered Users Posts: 86 ✭✭
    edited July 2022 #6
    I have the exact same buzzing. ill post my setup for review . ty peeps
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