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Thread: Battery Bank Wiring

  1. #1
    Joker Guest

    Default Battery Bank Wiring

    Hi everyone! Thanks for your help with this.

    I am writing a grant to fund the upgrade of a solar power system at a rural school in Uganda. I am currently in the process of accessing the state of the current system.

    This is the only picture that I have of the battery bank.



    I am attempting to determine how the batteries are currently configured, but this doesn't look like any of the diagrams I have come across. Has this bank been cross tied? Anything you can tell me about this picture would be extremely helpful.

    Edit: They are sealed lead-acid 12V/200Ah batteries

    Thank you

    Allen
    Last edited by Joker; December 2nd, 2009 at 16:56 PST.

  2. #2
    Join Date
    Mar 2006
    Location
    SF Bay Area (California)
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    21,219

    Default Re: Battery Bank Wiring

    What is the Inverter/Charger voltage? 12 or 24 volt DC... (I guess 60 VDC or 120 VDC is possible, but not standard or very common--at least around here).

    I don't see any other practical working voltage with 10 batteries...

    If 12 volts DC, then everything is connected in parallel.

    If 24 VDC, then each pair of batteries is connected in series, then each pair (5 pairs) are connected in parallel.

    -Bill
    20x BP 4175B panels (replacement) + Xantrex GT 3.3 inverter for 3kW Grid Tied system + Honda eu2000i Inverter/Generator for emergency backup.

  3. #3
    Join Date
    Jun 2003
    Location
    pittsburgh, pa
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    10,278

    Default Re: Battery Bank Wiring

    as best as i can make out it would appear to be series/parallel 24v for a 5x2 configuration. they are also sealed and are possibly agm.
    NIEL

  4. #4
    Joker Guest

    Default Re: Battery Bank Wiring

    Bill: The charger is a Tristar 12Volt/60Amp TS-60MPPT and the inverter is a Phoenix Mult. C 24V/5000Watt.

    Neil: I also though it was a 5x2 24 volt configuration but there seems to be too many cables.

  5. #5
    Join Date
    Apr 2007
    Location
    Lakeland Florida
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    1,959

    Default Re: Battery Bank Wiring

    The Tristar is 12/24/48V capable so go by the Inverter voltage which is 24V so Niel got it right

  6. #6
    Joker Guest

    Default Re: Battery Bank Wiring

    Can anyone tell from the picture if the bank if wired correctly for a 24 volt 5x2 configuration? The school has been having some problems with the system and I wouldn't be surprised to learn that the wiring is wrong.

  7. #7
    Join Date
    Apr 2007
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    Default Re: Battery Bank Wiring

    Most "problems" are either to little charge or too much load. Also, even if a perfect balance, battery's have a finite life time.

    Post the details of the charging source and the loads and i'm sure other will crunch the numbers for you

    From the picture, it looks correct for a 5x2 configuration

  8. #8
    Joker Guest

    Default Re: Battery Bank Wiring

    It's a hybrid system that is charged by the panels and the powerline when it is on. The powerline is very unreliable though and I have been told is also at a much lower voltage then it is supposed to be. Here are the system specs:

    (10) ASE Monocrystalline 150 Watt panels
    (1) Tristar 12 Volt/60 Amp charge controller
    (10) sealed lead-acid 200Ah batteries
    (1) Phoenix Mult. C 24V/5000Watt inverter

    Here is a picture I have of the charge controller and inverter.



    The school is looking to at least double their current number of panels and batteries.

  9. #9
    Join Date
    Apr 2007
    Location
    Lakeland Florida
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    1,959

    Default Re: Battery Bank Wiring

    Sounds like either the battery's are getting old/abused or the loads are too high. 5000 watt inverter for that battery bank is MUCH to big

    A good addition would be a battery monitor so the school could know when the battery bank has been depleted. I assume now, they run it until it cuts out on the low battery cutoff

  10. #10
    Join Date
    Sep 2006
    Location
    Willits, CA
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    5,692

    Default Re: Battery Bank Wiring

    I wonder if auto-EQ was disabled in the charge controller for Sealed batteries.

    (Any idea if the batteries are AGM or GEL sealed) ?
    http://tinyurl.com/LMR-Solar
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    Grundfos 10 SO5-9 with 3 wire Franklin motor (1/2hp 240V 1ph # 214505 ) on a timer for 3 hr noontime run - Runs off PV
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