Anderson SB series connectors, with the environmental boots, are great connectors. Like the Powerpole series, any arcing of contacts, when hot connected, occurs on the tips when initially mated. As they are pushed in further to fully engage, they are now making the connection on clean metal.
The only downside of this design is that the mating / unmating force is high for the two pole connectors.
Series
SB50 - 15 lbs
SB120 - 20 lbs
SB175 - 25 lbs
SB350 - 30 lbs
Having good access to both ends of the larger size connectors helps a lot.
For the battery fuse, it is sized to protect the battery and wires if they are accidentally shorted. For sizing consider that a discharged flooded battery can accept current at ~20% of the amp hour capacity of the battery or battery bank. An AGM battery will accept even more current when charging. I'd size the battery fuse to at least 1.5 x the maximum output of your converter so you don't blow fuses when charging the battery.
