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Old 21-06-2010, 03:53   #1
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Need to Add Buss Bar to New Batteries

We are installing new AGM batteries, and they have threaded holes for connecting the cables.

Because I have several cables to attach, I want to mount a buss bar there rather than stacking them all under the single bolt. I could make this of copper or brass. Copper has less resistance, but most buss bars I've seen are brass. Why is that, corrosion resistance, or for threading capability ?

Which would be better ? Also, I know I can find brass (Or bronze) bolts. Would copper, if i can find them, be better ?

Thanks.
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Old 21-06-2010, 04:24   #2
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Company called Blue Sea have some nice bus bars, which we used. Stainless steel so they don't turn into a horrible green mess. We used them becuase like you I didn't like the idea of half a dozen wires all connected to an engine bolt.

BusBars, Connectors & Insulators - Blue Sea Systems

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Old 21-06-2010, 04:24   #3
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Copper (tinned, if available).
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Old 21-06-2010, 05:17   #4
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Company called Blue Sea have some nice bus bars, which we used. Stainless steel so they don't turn into a horrible green mess. We used them becuase like you I didn't like the idea of half a dozen wires all connected to an engine bolt.

BusBars, Connectors & Insulators - Blue Sea Systems

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Pete,

Blue Sea uses tin plated copper for most all of their buss bars. Stainless has quite low conductivity when compared to copper on the IACS Conductivity scale. Copper is the metal all others are based on when it comes to conductivity. Only silver has a higher conductivity rating than copper.

Copper is at 100% on the IACS scale and stainless is down in the 2-3% range. Silver is rated as 105% and gold at 70%. Brass is only rated at about 28% so you'd need a very large piece of it to equal coppers conductivity.

Blue Seas is the right place to get quality pre-made buss bars.
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Old 21-06-2010, 05:30   #5
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I made my bus bars out of 1"x1/4" copper stock purchased from metal supermarket. Stainless bolts, but the connectors are contacting the bar stock.
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Old 21-06-2010, 05:42   #6
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I made my bus bars out of 1"x1/4" copper stock purchased from metal supermarket. Stainless bolts, but the connectors are contacting the bar stock.
--and if I might add, bronze, not stainless, washers between the contact surfaces and the fasteners.
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Old 21-06-2010, 14:24   #7
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Thanks !
We'll get a copper bar, and spray some coating on it after assembly. Looking at silicon bronze fasteners.
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Old 21-06-2010, 14:35   #8
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Pete,

Blue Sea uses tin plated copper for most all of their buss bars. Stainless has quite low conductivity when compared to copper on the IACS Conductivity scale. .
Blimey, I spent all afternoon bolts wires to the thing without even realising. I stand corrected, but yes nice kit as are their switches.

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