It’s not such an issue if your system is hard-wired into your electrical panel, but in this case you’ll need to have a qualified electrician do your installation, so follow whatever they say.
But a battery-based system really needs fuses or circuit breakers. You might think that since you have 12 volt batteries in your car that they’re not dangerous. The truth is that a short or overcurrent can deliver thousands of amperes of current into a fault, depending on the size of the battery array.
A fuse is a little device that fails if there’s too much power going through the circuit. This provides a basic level of protection, but you need to replace the fuse if it blows. Sometimes people take shortcuts and just patch across where the fuse was with a piece of wire. This defeats the purpose and makes the installation more dangerous.
A circuit breaker is a much better piece of equipment, because it can be reset once it trips. But you have to be sure to buy DC rated breakers, not AC breakers, because they handle current differently.
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