Battery Bank Configuration - Wiring

Posted by John D on June 24, 2008, 09:31:04 AM

Re: Battery Bank Configuration - Wiring (Reply #5)
Steve,

As I said, and as the article confirms, connecting all batteries to common bus-bars is your best option.  You're going to have some resistance no matter what you do, but at least with the bus-bar method you'll have balance, and few interconnections between each battery and the inverter. The fewer the interconnections, the less resistance.

You can use a good quality digital voltmeter to check for problems at every connection point.  Check each connection point while the inverter is heavily loaded. 

John
 

Posted by Steve M on June 24, 2008, 03:12:49 PM

Re: Battery Bank Configuration - Wiring (Reply #6)
Thanks again John, Yep it looks like the best option is going to be use the bus bar option. The problem I have now is how do I connect all the batteries to the inverter?

Specifically:

How do I keep all cables as short as possible?
How do I keep interconnections to a minimum?
Which metal has the lowest resistance (that is affordable)?

Help/suggestions would be appreciated

Steve
 

Posted by Travis M on June 24, 2008, 04:07:47 PM

Re: Battery Bank Configuration - Wiring (Reply #7)
I'd use a breaker box, like this one

http://store.altenergystore.com/Enclosures-Electrical-and-Safety/Electrical-Enclosures/Combiner-Boxes/Midnite-Solar-MNPV6-Combiner-Box/p4566/

It has a bar for common positive, and you can use breakers and / or DIN-rail-mount distribution blocks http://www.mcmaster.com/catalog/114/gfx/small/6367tp1s.gif

The distribution blocks could even be used so you can combine each shelf from many smaller wires to two larger wires.

Using breakers would allow you to "shut off" part of the battery array for maintanance without losing power.  It's something I'll be doing in my off-grid garage soon.
« Last Edit: June 24, 2008, 04:10:33 PM by Travis McMillian »
 

Posted by John D on June 24, 2008, 04:25:03 PM

Re: Battery Bank Configuration - Wiring (Reply #8)
Steve,

Travis has the right idea.  The box keeps all of the wires safely enclosed and out of sight.  On the other hand, I try to get by as cheap as possible.  I poked around in the electrical section of my local hardware store and found bus bars for about $5.00 each.  Each bar allows about 15 heavy guage wires to be attached to it via large set screws.  I mounted each of the bars on a piece of plexiglass (for insulation).

Important:  Use the heaviest guage wire you can from the bus bar to the inverter, and keep THOSE wires as short as possible.  Those wires will be passing the heaviest current.

To answer your other questions:  You'll just have to use heavy guage wire, and keep each one as short as possible. I believe copper would be best.  The bus-bar arangement limits the number of connection points, so that helps.  I bought some large copper crimp lugs from Wal-Mart and soldered the wire to them instead of crimping. 

John
 
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