In the example, we’ll use 5m of 0.5mm 2 cable with a resistance of 0.037 Ω/m, which is typical resistance for a cable of this type. You are not going to kill yourself with the cables getting hot, but it is not something you want in your design. Finally, you have the sheath, the plastic or rubberised outer layer that protects the cable from damage and from the elements.

These 1m length battery – inverter cables are suitable for large loads from batteries to 230v inverters. Made in the UK for battery connections where it is important to move high current loads. Expressed in Amperes (Amps or A) and is the maximum continuous or 'working' current that the cable can safely carry.When I had around a metre total length between inverter ( Victron Multiplus 12/3000) and Battery Bank, I ended up, after some changes (which will come on to) with the battery interconnect cables (the ones that go +ve to +ve and -ve to -ve within the bank) being 50mm2, and the Tap Off from the battery bank to the Inverter to be 70mm2. The following are some points you should consider when selecting cable for a particular application:

Heat is a byproduct of energy transfer and the cable will produce heat as it transports energy. The cable rating will include a thermal limit, the amount of heat the cable can safely dissipate. Secondly, it has a greater working temperature range with a maximum of around 105ºC compared with around 70ºC for standard PVC. This makes it more suited to use in areas close to the engine. The units that are used to identify power inverter cables is in AWG, or the american wire gauge, which has been used in North America since 1857, and has since been the standard measurement for solid, nonferrous, round, and electrically conducting wires. Below are the typical sizes for power inverter cables In North America the AWG standard is most commonly used for stranded cable and expresses the Gauge together with the number of strands and their Gauge. For example, a cable specified as 16 AWG 7/24 has a size of 16AWG and is made up of 7 individual strands, each of 24 AWG.You have the wire core, Class 5 or EIC 60228, made of copper or aluminium. This is arguably the most important part of the cable.