So one would think that for the parallel connections you could use smaller wire appropriate for 1/2 or 1/3 the amps. If you had 3 in parallel then each would handle 1/3 of the amperage. Then each battery will handle 1/2 of the amperage. Let's say you have 2 batteries in parallel. The parallel connections share the amperage. Use 4/0 for all of the series connections. So your plan to use 4/0AWG for the main wires but only 4AWG for the series connections is not going to work. Since all of the wires need to handle the full amperage then all of the wires need to be the same size large enough for those full amps. The amps going from the main wires through the series connections is all the same. Let's say you have 4 12V batteries in series. Let's assume you chose 4/0AWG and not 2/0AWG from the battery bank for this discussion. Sizing of wiring connecting complete battery bank to motor controller, then to motor (TBD, obviously as short as possible): planning on 2/0 OR 4/0, depending on length of run.Sizing of wiring connecting battery banks in parallel (12-24" lengths): planning on 2/0g.Sizing of wiring connecting batteries in series (6-12" lengths): planning on 4g.Main load will be a 48v electric motor that is rated for continuous 150A draw.8x 12v batteries: 4x batteries wired in series to achieve 48v, 2x of these sets will be wired in parallel ( similar to this diagram).Question: how does one size cables between batteries and output loads in a 48v system? I am very familiar with 12v systems, but this is my first time working with a high amperage 48v system, so I want to be certain that I am doing things correctly. Feel free to link to another post/article if you know of one. ![]() Looked around online and on this forum and did not find a straight-forward answer, but I'm sure it exists.
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