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

boywonder

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

Gregmik

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

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

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

Adding this attachment diagram of existing 4 battery setup.

boywonder

Gregmik

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

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:


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

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

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

boywonder

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

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

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

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

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.

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