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Old 02-12-2017, 09:14 PM   #1
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What Type of Bolts for 12V Connections?

What type of metal bolts do you use for making connections to copper bar in battery and inverter installations to avoid galvanic corrosion? Brass? Stainless steel? Like many others here I am considering using some copper bar for bus bars or in lieu of ordering custom length 4/0 cables and I'm not sure what type of metal bolts to use?-- Frank
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Old 02-13-2017, 01:51 AM   #2
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Brass is a good choice.
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Old 02-13-2017, 07:15 AM   #3
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Quote:
Originally Posted by fran&frank View Post
What type of metal bolts do you use for making connections to copper bar in battery and inverter installations to avoid galvanic corrosion? Brass? Stainless steel? Like many others here I am considering using some copper bar for bus bars or in lieu of ordering custom length 4/0 cables and I'm not sure what type of metal bolts to use?-- Frank
I use copper bar extensively in all of my installations and usually rely on the bolts that are included with the specific batteries spec'd for each one.

Lifelines use a silicon-bronze bolt while Victron uses stainless. These are the same materials that are used for the respective output electrodes so the threads are also of the same material.

Be sure that you are using a bar that is of proper dimension for your electrical needs. I typically use 1" X 1/8" bar for short runs (up to 6") to replace 2/0 weld cable and 1" X 3/16" to replace 4/0 weld. For longer runs (up to a maximum of 12") I de-rate the ampacity of bar one size and use the larger size. Generally, any run much over 6" can use cable unless you are in very tight spaces.
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