Thanks for the suggestions. This is a very compact installation
so the wire lengths are minimal. The alternator
output to the house bank is no more than three feet and the house bank to the busbar is at most 18 inches. The 90A and 40A chargers are never on simultaneously and both chargers are within 18 inches of the busbar.
I'm not sure what I was thinking with the 50A fuse to the solar charger
. There is a maximum of 15 - 16A on that wire so I'll switch to a 20 or 30A. Safety
is the main reason for a fuse on the alternator output wire. Its 80A fuse has been OK for two seasons but I understand the problem so I'll increase that to 100A and review the size of the wire.
I'm not sure I follow the suggestion to disconnect the positive at the house bank. I have a disconnect at the DC panel to disconnect any house loads. The disconnect on the negative at the battery
bank is a safety
to completely disconnect the house bank.