Hi, I have a cruising boat that I am installing a new LifePO4 house bank on. I have 4/0 cables leaving the battery and going (through fuse/shutoff for POS, through shunt for NEG) to 600a busbars. All good thus far.
My question is what happens from the NEG busbar to connect to boat common ground. Does that wire need to be 4/0 as well or can it be 1/0 which would be the same as the positive wire from the panel. I was thinking that all current going to the POS busbar would stay local and head back to the battery via the NEG busbar and 4/0 black wire.
Second is the connection point to common ground. I have a busbar in front of the engine, about 10ft away. I have the NEG posts of the starter batteries, I have the contacts ON one of the engines and I have the NEG bar that is behind the panel (about 9ft away). I have included a pic of the busbar behind the panel. Not sure that it can handle a 4/0 lug if that is needed.
Thanks
My question is what happens from the NEG busbar to connect to boat common ground. Does that wire need to be 4/0 as well or can it be 1/0 which would be the same as the positive wire from the panel. I was thinking that all current going to the POS busbar would stay local and head back to the battery via the NEG busbar and 4/0 black wire.
Second is the connection point to common ground. I have a busbar in front of the engine, about 10ft away. I have the NEG posts of the starter batteries, I have the contacts ON one of the engines and I have the NEG bar that is behind the panel (about 9ft away). I have included a pic of the busbar behind the panel. Not sure that it can handle a 4/0 lug if that is needed.
Thanks