Conext 4024 won't power up

crabby
crabby Registered Users Posts: 1 ✭
in Advanced Solar Electric Technical Forum #1
Connected up my new conext 4024 to 24 volt battery bank at 24.5 volt. All three front lights come on, the fan starts up then the unit shuts down!
any ideas out there
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  • MrM1
    MrM1 Registered Users Posts: 487 ✭✭✭✭
    edited November 2018 #2
    Do you also have it on AC input power?    When you turn it on,  are there also AC loads on the inverter.  24.5v resting for a battery bank is kinda low.  At 24.5v Open Circuit voltage you are already at 60% SOC.  Once loads are applied it might be going lower than the LBCO for the inverter.  I would start by checking the LBCO setting.  Do you have the System Control Panel (SCP) and/or a combox.  If not you are at the mercy of ALL defaults for SW and I have found most defaults are off. 

    I have my LBCO set to 22.2v and my delay set to 55 seconds so that a large momentary load (think pump motor surge) will not trigger an inverter shutdown. 
    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
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  • MrM1
    MrM1 Registered Users Posts: 487 ✭✭✭✭
    #3
    Default is 21v for the Conext SW 4024
    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
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,651 admin
    #4
    What is the DC voltage on the input terminals to the Inverter as it powers up?

    Good size battery bank, short/heavy/bolted cables needed for DC power. For example, automotive jumper cables generally do not make good enough connections to start up any good sized inverter.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    edited November 2018 #5
    Try disconnecting all AC loads before powering up, eg. main AC breaker off, 24.5V could indicate a low state of charge, check battery voltage at the DC input during start up see if it sags.  What battery capacity do you have, has the SW4024 been configured with a SCP or Combox or just defaults?.
    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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  • Photowhit
    Photowhit Solar Expert Posts: 6,009 ✭✭✭✭✭
    #6
    Was the battery at rest when you read 24.5 volts or was it charging off a solar array?
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former backup...lol), 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
    - Assorted other systems, pieces and to many panels in the closet to not do more projects.
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