Schneider SW4048

HjveraHjvera Registered Users Posts: 1

Hello, I have this problem with my schneider sw4048 inverter, the installer technician set me up the system and the first month worked perfectly and now it gives a fault 1 AC Output Under Voltage. Automatically try to solve the system 3 times every 2 seconds but it comes back and stays with the failure. I have done it by clear manual and neither. I hope that someone has the answer and can help me.


  • EstragonEstragon Registered Users Posts: 4,494 ✭✭✭✭✭

    Does turning off your AC loads help?

    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
  • BB.BB. Super Moderators, Administrators Posts: 31,688 admin

    Have you checked that the AC output wiring is not shorted (conduit that left burs on the inside diameter and cut through the insulation)?

    Disconnect L1 and L2 "hot wires" on the AC1 output at the inverter?

    There is the old, shut inverter down, shut any chargers off, turn of DC power to everything, etc. -- Wait five minutes, then reboot....


    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • mcgivormcgivor Solar Expert Posts: 3,817 ✭✭✭✭✭✭

    If disconnecting loads solves the problem and no short circuits are found, make sure that the each line is ballanced, not having multiple high current loads on a single side of the split. Assuming a split phase 120/240V unit not a single phase 230V.

    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.
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