I considered a high amperage breaker, however, over the years I have experienced breaker failures and I have a great deal of trust in fuses, even though high amp fuses are rather expensive, I like them the best. Always keep in mind, when working around any large batteries that tools should be insulated and use extreme caution in connecting and disconnecting batteries, consider how you would handle a firearm, like it's always loaded, You don't know when a battery may have hydrogen gas built up in the air chambers above the cells and just a small spark could blow the battery to pieces, I've seen that happen and it's scary. I'm pretty sure that if I wanted to I could weld 1" thick steel with the battery system that I have, so I hold great respect for the power that they have and always use the greatest caution working around them. One other thing, I have an old computer fan, that runs on 120 volts AC, that I mounted over a hole I cut in the floor that pulls in outside air from under the shed, this keeps a constant positive air pressure in the battery shed that blows battery gases out of two holes in the wall behind the battery bank so that all explosive gases are always vented to the outside, 20 feet away from the fan intake.