Yes, it is a good idea to keep some extra fuses in case of storms or power surges. Carefully read the following before changing a fuse on your own! You MUST always turn off the breaker (make sure it is the correct breaker also) before you change the fuse. If you fail to do so, you can and will suffer major injuries. There is a lot of voltage going through your unit's disconnect box. If you touch the wrong thing without having the breaker off, you will get hur