Thanks for the comments and suggestions. Due to the varied opinions on the fuse size, I decided to contact a marine electrician to look at the setup and see what he recommended. He confirmed the fuse size is satisfactory to protect the cabling. So as it is now wired, I have two 8Ds for starting, one also powers the windlass, and they can be combined if necessary. The separate inverter bank powers the house and the hydraulic crane. There are individual batteries for the genset and the thruster. I also installed a battery monitor on the house bank to measure the SOC. The starters, genset, and thruster batteries are charged by the Victron 40amp/alternators, while the house/inverter bank is charged by the Magnum 125amp charger.