Circuit breaker or fuse?

Ok. I’m OK with fuses, I’ll just have to carry a couple of spares just in case.
I will have A high amp shut off switch. And will be using 4/0 welding cable for power.
I will get the fuse instead.

Size the fuse or breaker to protect the wire connecting the battery to the inverter. For example, I am using #4 wire to connect my 600W inverter, so a 60a breaker is installed. The larger the wire, the bigger the fuser/breaker capacity you can have.

time2roll wrote:
Fuse. Quality DC breakers in the 300+ amp range seem to be expensive.

Yep, there are a lot of cheap Chinese breakers out there on the market that I wouldn't trust.

A decent-quality one isn't cheap.

Fuse. Quality DC breakers in the 300+ amp range seem to be expensive. Never opened the fuse on mine.

dodge guy wrote:
So. I’ll be installing a 3000W inverter and with that, what is better? A 300A circuit breaker or an ANL fuse? I like the fuse so I don’t have to keep spare fuses, but a circuit breaker will be easier to just reset.

look at or estimate what the MAX short circuit current of your battery bank could be. Make sure whatever fuse or breaker you choose will interupt that current level.

When I did checking for my install of a 1000W inverter, ANL fuses worked, most reasonably sized, affordable, obtainable circuit breakers weren't spec'd for the battery bank short circuit current capability.

I would want a way to disconnect power to the inverter quickly in an emergency. A breaker allows for that. I'm not sure why you think you wouldn't need a spare fuse. I would think a spare would be a good idea. Sometimes inverter go a little crazy and power cycling them will reboot the processor and make it work again. It's a lot easier to power cycle with a breaker as well.