I'm also using a 300-amp fuse.
(Mostly because they are cheap. You can go over 300 amps briefly. I would have to PAY GOOD MONEY to buy a 500 amp fuse. 300 amp and less can generally be scrounged. I think I have blown fuses twice.)
Yep, you always want to have a good fuse around, especially high-power stuff!
Another possibility is a high-amperage DC-RATED circuit breaker. They are harder to find and more expensive. If you scrounge one though, great! You never have to replace a fuse that way!
(You could also have it under your hood and run a hood-release type cable to it, now you have a battery-disconnect/emergency stop!)
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