Conext SW 4024 Odd Error / Fault Question

MrM1MrM1 Registered Users Posts: 487 ✭✭✭✭
This morning at 7am with no warning, my house went dark.  Odd because I have a grid interactive hybrid system using a Conext SW 4024, so even if grid power is lost (which it was not),  I should not loose power.

  • The Inverter IS connected to the Grid but does NOT back feed to the grid
  • I had power coming in from the grid,  but the inverter went into a Fault so my house had no power for the circuits passing thru the inverter
  • I had Load Shaving on but my load was so low it was not even "shaving"
  • Batteries were at 95% charged
  • The sun was not up yet.

But I got this fault and the whole house went dark as the inverter shut down
Time: Time Stamp Unavialble
ID: 55
Fault Name: EEPROM Error
What is that?    Why did the Inverter return this error code?   Is it a random thing,  or something that is "Dying" in the inverter?   Dangerous?
I cleared the code and the inverter is back up and running.
Thanks in advance
REC TwinPeak 2 285W 3S-3P 2.6kW-STC / 1.9kW-NMOT Array / MN Solar Classic 150 / 2017 Conext SW 4024 Inverter latest firmware / OB PSX-240 Autotransfomer for load balancing / Trojan L16H-AC 435Ah bank 4S connected to Inverter with 7' of 4/0 cable / 24 volt system / Grid-Assist or Backup Solar Generator System Powering 3200Whs Daily / System went Online Oct 2017 / System, Pics and Discussion


  • mcgivormcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    edited March 2020 #2
    Eraseable Programmable Read Only Memory  (EPROM) The settings are stored on an EPROM chip, there may be a conflict between settings or something occurred out of sequence, the inverter is self protecting by shutting down It's unlikely that it is a sign of demise, nor is it dangerous, IMHO.  
    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.
  • stmarstmar Solar Expert Posts: 367 ✭✭✭
    Found this in the owners guide manual, Troubleshooting page 5-8 table 5-3

    A problem has been detected with the internal memory.Clear the fault and check the latest configuration made or any recent configurations. If fault detection reoccurs or occurs frequently, service is required.

  • Dave AngeliniDave Angelini Solar Expert Posts: 6,224 ✭✭✭✭✭
    edited April 2020 #4
    Mike, in an XW F55 is a rare fault condition that is usually attributed to a sudden loss of DC, i.e. tripping the DC breaker. 
    Another known cause is AC interference caused by routing Xanbus cables near AC conductors. Make sure all equipment is properly grounded 
    and route the Xanbus cables thru the shielded raceway at the bottom of the conduit box.  F55 indicates a data corruption in the user configuration that has caused the inverter to return to factory defaults.

    I would not worry about it until it does something more identifiable. I know this is a CSW but it is similar in nature. So if you are sure the known causes above are good, you can just add a glitch from the grid. The only time I have ever seen these is in large gensets with master slave inverters and loads that trigger the second inverter.
    "we go where power lines don't" Sierra Nevada mountain area
    E-mail [email protected]

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