Ideal wire gauge for connections between batteries?

Choosing the Right Wire Gauge

When selecting the ideal wire gauge for connections between batteries, consider the system’s total capacity, wire length, and maximum current draw. A general rule of thumb is to use 2 AWG wire for systems with 4-10 parallel battery strings, 4 AWG for systems with 2-4 parallel strings, and 6 AWG for single battery strings or systems with minimal parallel strings.

Calculating Wire Size Requirements

To calculate the required wire size, use the formula: Wire Size = Total System Current / 0.8 x Wire Temperature Rating. For most deep cycle battery systems, a temperature rating of 60°C (140°F) is sufficient. Using this temperature rating and a maximum system current of 200A, the required wire size for a 2 AWG wire is 1.8 AWG, but to be safe, stick with 2 AWG.

Safety Considerations

When working with high-current battery connections, safety should be the top priority. Always use wire with a 10 AWG minimum ground wire and make sure all connections are secure and properly insulated. Ensure that the wire is not damaged or pinched during installation and that all wiring is kept away from heat sources and flammable materials.