Xantrex sw5548 gen sync error

johnmaujohnmau Registered Users Posts: 1
Have a two 2007 Xantrex model sw5548 that are stacked and have been hooked up for several years working fine. Off grid system in Texas. Have a large batt bank and a 2017 Kohler 30kw gen that comes on and off automatically. All has worked fine for quite awhile ( 600 hrs on gen). Today I manually turned the gen on and both inverters sync’d fine. About 30 min later some lights flickered in house so I went to investigate. Master inverter had lost sync and was attempting to re attempt bit could not. Inverter somewhat got lost and was somewhat surging and lights were flashing. Shit it down so it would do more damage. Had a gen sync error. Haven’t had that before. Had to hard shut it off to get it to quit. Turned back on and inverted fine. Checked gen. Volts and freq good. Checked every setting I could and all good. We lowered the charger amps thinking we were messing with it’s brain at a max setting but still did it. Thinking we have a relay R7 or R8 that might be weak? Any thoughts would be appreciated. Thx


  • CutterzooCutterzoo Registered Users Posts: 1
    Posted almost the same exact problem two days before you.
    I don't currently have a meter capable of measuring frequency, so have not been able to determine that, but based on my other troubleshooting, doesn't seem likely.

    Please hit my post if you find a resolution, and I'll do the same.

    - Mike
  • mcgivormcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    Could be the contacts of the transfer relay are becoming high resistance due to arc induced pitting, if access to them is possible they could be dressed with 320 grit wet/dry paper or emery cloth. This is common for relay contacts that have been in service for extended periods, often resulting in the contacts becoming welded due to the heat buildup.
    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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