It's all about temperature. insulation increases the temp and thus resistance. Buss bars uninsulated but protected from contact can be smaller than cable size with the same drop. On a boat, tinned/plated wire should be used for trouble free operation. A little ingenuity while connecting batteries could prove to be a beautiful thing. Among other advantages; plated buss bars could eliminate compression connectors, reduce weight through lower copper volumes, and assure moisture content could not be maintained next to conductors.
After removing conductor protection one could visually determine conductor quality while doing maintenance. It is not that wire must be used. Buss bars when properly protected from human contact is acceptable.
Kevin Pemberton
On 03/13/2011 04:23 PM, James Lambden wrote:
Richard,
According to ABYC code:
00 cable with 105 degree C insulation temperature
- in an engine space 162 amps- outside engine space max 30 degrees C ambient temperature: 182 amps
000 cable with 105 degree C insulation rating
- in an engine space 187 amps- outside an engine space max 30 degrees C ambient temperature : 237 amps
0000 cable with 105 degree C insulation rating
- in an engine space 209 amps- outside an engine space max 30 degrees C : 266 amps
As a general rule of thumb we are even more conservative, recommending 100 amps on a 2/0 cable.
What is very important to consider is the crimp, and the contact area of the lug, to avoid hot spots.
James
On Mar 13, 2011, at 3:53 PM, Richard Mair wrote:
Just wondering what wire sizes people are using to set up the series connections on the batteries and connect them to the motor..
48 volt system with a max draw of 100 amps. Most times I expect to be in the 20 amp range from the anticipated figures
Thanks Richard
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