Adding 2 more T-105's - Wiring Diagram?

boywonder
boywonder Registered Users Posts: 16
I have just purchased two more Trojan T-105's w/ 4/0 (welding cable) connection cables. I'm adding them to the existing 4 T-105's I already had for a total of 6 (the existing 4 batteries are only a month old).

I'm wondering if the enclosed diagram I made is correct?

Also, are there any precautions I need to take while wiring these in? Do I need to dis-connect or turn anything off while making the connections?

Any and all help appreciated.
boywonder

Comments

  • Gregmik
    Gregmik Registered Users Posts: 19
    Re: Adding 2 more T-105's - Wiring Diagram?

    Are you looking for 18v? If not this is not the correct wiring.

    I am a newby so I could be wrong,

    Greg
  • boywonder
    boywonder Registered Users Posts: 16
    Re: Adding 2 more T-105's - Wiring Diagram?

    Greg,
    Thanks for the reply.

    This is for an RV setup so I'm assuming it needs to be 12v.

    Thanks,
    boywonder
  • boywonder
    boywonder Registered Users Posts: 16
    Re: Adding 2 more T-105's - Wiring Diagram?

    Adding this attachment diagram of existing 4 battery setup.

    boywonder
  • Gregmik
    Gregmik Registered Users Posts: 19
    Re: Adding 2 more T-105's - Wiring Diagram?

    OK, as I said I am a newbie. I rethought about your first diagram and it would work.

    Sorry,

    Greg
  • jagec
    jagec Solar Expert Posts: 157 ✭✭
    Re: Adding 2 more T-105's - Wiring Diagram?
    boywonder wrote: »
    I have just purchased two more Trojan T-105's w/ 4/0 (welding cable) connection cables. I'm adding them to the existing 4 T-105's I already had for a total of 6 (the existing 4 batteries are only a month old).

    I'm wondering if the enclosed diagram I made is correct?

    Also, are there any precautions I need to take while wiring these in? Do I need to dis-connect or turn anything off while making the connections?

    Any and all help appreciated.
    boywonder

    That will work, but use bus bars instead:
    busbars.png

    The reasoning is that this way there is no question that each battery pair is seeing the same charging current. With them wired as a string there will always be small variations.
  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    Re: Adding 2 more T-105's - Wiring Diagram?

    even if you use a buss bar, feed from opposite corners .
    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 ,

  • boywonder
    boywonder Registered Users Posts: 16
    Re: Adding 2 more T-105's - Wiring Diagram?

    I'm very new to solar and not yet familiar with all the terminology. Would the below image/example be correct using "buss bars" and "feed from opposite corners"???

    Can the Buss Bars be purchased at a electrical supply or perhaps Home Depot or Lowe's??? I've found some on eBay but we are traveling in an RV and usually don't stay in a location long enough to have stuff shipped.

    Really appreciate everyone's input and I apologize for being so "Green" at this, but I am learning as I go.

    Also, reverting back to the original post, do I need to take any precautions such as turning everything off and dis-connecting anything prior to adding in the 2 new batteries???

    boywonder
  • niel
    niel Solar Expert Posts: 10,300 ✭✭✭✭
    Re: Adding 2 more T-105's - Wiring Diagram?

    if going to a place like lowes you can use something like this,
    http://www.lowes.com/ProductDisplay?partNumber=71794-1318-ECLX072M&langId=-1&storeId=10151&productId=3180689&catalogId=10051&cmRelshp=req&rel=nofollow&cId=PDIO1

    now that may not be large enough so you could just use a good bolt and nut with washers and bolt all 4 wires for each polarity together.
    both of these assume you to use equal wire lengths from the battery to the bus or bolt to distribute loads and charges evenly.

    if going to naws this can work too,
    http://www.solar-electric.com/16220-1.html
  • Cariboocoot
    Cariboocoot Banned Posts: 17,615 ✭✭✭
    Re: Adding 2 more T-105's - Wiring Diagram?

    Our favourite standard reference for battery bank wiring, SmartGauge: http://www.smartgauge.co.uk/batt_con.html

    And yes, do shut everything down so there is no current flowing in or out when you try to change battery wiring!

    For best results (maximum safety) each battery string should have its own fuse before connecting to the common point.
  • DavidOH
    DavidOH Solar Expert Posts: 112 ✭✭✭
    Adding 2 more T-105's - Wiring Diagram

    Thanks Jagec. I may use that configuration if I move up from 4 batteries to 6.

    http://www.trojanbatteryre.com/DataSheets.html
    http://i54.tinypic.com/29zpzd5.jpg
  • Wilis
    Wilis Solar Expert Posts: 84 ✭✭✭✭
    Re: Adding 2 more T-105's - Wiring Diagram?

    I went to Lowes and purchased aluminum strips. They are 1/8 by 1 1/2 inch. They have different sizes. I just drilled the right size hole to fit the battery posts. My post are on the top on T-105’s. Seemed to work ok so far. Don’t know of any reason aluminum can’t be used in battery box. If so someone speak up.
  • BB.
    BB. Super Moderators, Administrators Posts: 33,431 admin
    Re: Adding 2 more T-105's - Wiring Diagram?

    Aluminum forms an oxide on surface in seconds to minutes so is very difficult to make good electrical connections.

    As the connection corrodes, the connection heats up, the aluminum expands and cold flows around the fasteners. The current flow stops, the aluminum cools and pulls back, allowing more corruption to form.

    Eventually the connection will fail. Many house fires have been caused by aluminum electrical wiring "properly installed" around 40 years ago.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset