I want to stock up on replacement fuses in case they blow. I've noticed a couple 30 amp, the 50 amp, 100, 120 and 140 amp fuses are different in size than the rest. There are generic mini fuse kits for 7.5 to 30 amp fuses but I am not sure what kind of fuses are the 30+ amps. Comparing pics of the large fuses on Amazon says they aren't compatible despite looking the same. So Im asking what are they and where can I get those 30+ amp fuses?