Conext xw 4548 with -48v battery bank

11JAGAN11JAGAN Solar Expert Posts: 34 ✭✭
The requirement is for remote telecom application

current scenario

There will be two generator (complete off grid) each run twelve hours a day to take care of 3500w load (combination of 230Vac and -48Vdc load)

Attachment not found.

if i stop the generator the the ipms battery bank will take care of -48 Vdc load

but the AC load will be off

i am searching a solution for it


()


Can i use conext XW 4548 with a positive grounded battery bank?

if so how can i do that?

or any other inverter can function at -48Vdc



Thanks in advance

Comments

  • mike95490mike95490 Solar Expert Posts: 8,369 ✭✭✭✭✭
    Re: Conext xw 4548 with -48v battery bank

    I don't know about + gnd battery bank, but why can't the 4548 inverter/charger, actually invert and provide the 3500w AC too ?

    And I'd throw in at least one more generator, because you are going to be running those 2 into the dirt really quick. The $300 big box store generators have a 500 hour design life, you should be looking at a small water cooled diesel, I think Yamar engines are used in them. Kubota makes one (7Kw) too.
    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 ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

  • 11JAGAN11JAGAN Solar Expert Posts: 34 ✭✭
    Re: Conext xw 4548 with -48v battery bank

    The isolated power modules(IPMS) is a charger with a battery bank (which is positive grounded).

    i don't want additional battery bank ,since the battery bank inside ipms is sufficient for me.

    i just want an inverter which should operate at -48v dc
  • Blackcherry04Blackcherry04 Solar Expert Posts: 2,490 ✭✭✭
    Re: Conext xw 4548 with -48v battery bank

    Try this and see if it suits you. Ck with Schneider customer service if in doubt about a XW.


    http://legacy.outbackpower.com/pdf/tech_notes/Positive_Grounding_of_OutBack_Devices_Rev2.pdf
  • 11JAGAN11JAGAN Solar Expert Posts: 34 ✭✭
    Re: Conext xw 4548 with -48v battery bank

    Can i do like thisAttachment not found.
  • BB.BB. Super Moderators, Administrators Posts: 29,482 admin
    Re: Conext xw 4548 with -48v battery bank

    Just be careful with any I/O (communications, RS 232, RS 422, i/o ports). They will usually be referenced to the negative battery bus voltage (i.e., that will be "signal ground"). If you connect to external/other equipment--The shifted "positive" ground can blow wiring between devices with mix positive/negative grounds.

    Some interfaces, like 10/100/1,000 BaseT Internet, are (usually) transformer isolated interfaces and a good way to communicate between positive and negative ground referenced devices.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • 11JAGAN11JAGAN Solar Expert Posts: 34 ✭✭
    Re: Conext xw 4548 with -48v battery bank

    i am not going to use any communication device in this

    any other issues
  • mike95490mike95490 Solar Expert Posts: 8,369 ✭✭✭✭✭
    Re: Conext xw 4548 with -48v battery bank
    11JAGAN wrote: »
    i am not going to use any communication device in this

    any other issues

    How do you program it? The Combox or SystemControlPanel run off the Xanbus. I don't know if it is isolated or not.
    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 ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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