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It's actually 16mm squared which is actually a bit under 5AWG as well. It does get a bit warm after using anything high-draw, but never too hot to hold

I'm following Will's 400watt guide but purchased a 180 Amp circuit breaker instead of 50. What is the reasoning behind a 50 Amp for a 40A MPPT? Why not put the inverter and DC fusebox on the circuit breaker as well so that you can shut everything off when disconnecting/connecting the battery?

I'd agree with turning off/unplugging when not in use. Heard good things about the Nuwave Precision Induction Cooktop Flex which you can buy on amazon. https://www.amazon.com.au/dp/B07FXP2BSW ( Not affiliate link )

So seeing as my wire is big enough for both circuit breaker and fuse I can just ditch the fuse and hook it all on the breaker?

Why do you think Will decided to use both, he must have a good reason

Ah right so I need a 120 Amp circuit breaker or thicker wire. So the inverter came with 5 AWG wire to connect it to a battery as it uses around 125 Amps absolute max, but running more DC loads through that would set it ablaze.

Yea this is why I want to use the circuit breaker for everything instead of the fuse - so I won't have to replace a fuse but mainly so that when I disconnect/reconnect battery I don't get a spark charging up inverter capacitors

Is it safe enough to use two, three 5AWG cables in parallel instead of one large 1 or 2AWG? $160 AUD for 25 feet of 1AWG!

Alright so you go about 10 Amps over what's rated for that equipment so that if something goes wrong, it will only go around 10 amps over and not more? If I had a 80A MPPT for example I would get a 90A circuit breaker/fuse? Assuming it's not safe to trust the device itself as Will has included...