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Wire Gauge Questions
#11
(08-20-2019, 10:44 PM)OhmGrown Wrote: Specifically because the inverter I'm using is 12V & the right size, whereas the 24V inverters I've found are much bigger. Also with the layout I have, I can only fit 4 strings of 100 cells in my enclosure. I understand I could break that down to 7 strings of 56 cells but that changes drastically the layout of the cell packs and the limited space I have for wiring. Everything right now just barely fits perfect with a 12V application and I also have the added benefit of using a lot of components originally designed for the auto industry without having to get a large step down converter that can handle the amps I need.

Then I would recommend to go with LiFePO4 cells. Keeping the cells balanced and operating within the voltage range of the inverter is drastically simplified.
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#12
Based on this chart https://www.powerstream.com/Wire_Size.htm - the 2/0 (i.e. 00 gauge) chassis wiring is listed at 283a. These charts vary here and there. As a real world example, I use 2/0 AWG welding wire (i.e. flexible, multistrand copper) with the longest stretch is about 6ft (from battery to control box). I can attest that it get's 'slightly warm' to the touch at the 100a to 120a level (several hrs/day) in a 27C ambient air environment.
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#13
(08-20-2019, 11:15 PM)OffGridInTheCity Wrote: Based on this chart https://www.powerstream.com/Wire_Size.htm - the 2/0 (i.e. 00 gauge) chassis wiring is listed at 283a. These charts vary here and there. As a real world example, I use 2/0 AWG welding wire (i.e. flexible, multistrand copper) with the longest stretch is about 6ft (from battery to control box). I can attest that it get's 'slightly warm' to the touch at the 100a to 120a level (several hrs/day) in a 27C ambient air environment.

Sweet, I've found quite a few of those charts online and, you're right, they all do seem vary fairly significantly between each one. I'll probably use this one moving forward since it seems to be the most conservative though.
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#14
(08-20-2019, 11:53 PM)OhmGrown Wrote:
(08-20-2019, 11:15 PM)OffGridInTheCity Wrote: Based on this chart  - the 2/0 (i.e. 00 gauge) chassis wiring is listed at 283a.  These charts vary here and there.  As a real world example,  I use 2/0 AWG welding wire (i.e. flexible, multistrand copper) with the longest stretch is about 6ft (from battery to control box). I can attest that it get's 'slightly warm' to the touch at the 100a to 120a level (several hrs/day) in a 27C ambient air environment.

Sweet, I've found quite a few of those charts online and, you're right, they all do seem vary fairly significantly between each one. I'll probably use this one moving forward since it seems to be the most conservative though.


Those charts all you a really long(for this use) length for the minimum length, I think the cables will handle more current when they are not 4ft long or etc.
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