
The total length of
cables to one pair of
batteries should be the same for all.
I.E.
Pair 1.
The cable between the plus bar and
battery plus pole 0.5 m.
The cable between the two batteries 0.2 m.
The cable between battery minus pole and the minus bar 0.3 m.
Total cable length 0.5 + 0.2 + 0.3 = 1.0 m.
Pair 2.
The cable between the plus bar and battery plus pole 0.4 m.
The cable between the two batteries 0.2 m.
The cable between battery minus pole and the minus bar 0.4 m.
Total cable length 0.4 + 0.2 + 0.4 = 1.0 m. (the same as pair 1)
Pair 3.
The cable between the plus bar and battery plus pole 0.3 m.
The cable between the two batteries 0.3 m.
The cable between battery minus pole and the minus bar 0.4 m.
Total cable length 0.3 + 0.3 + 0.4 = 1.0 m. (the same as pair 1 and 2)
If you from other calculations have come to that you should have 70 mm²
cables, then the cables between the batteries and the bar would have been enough with 25 mm², but put 35 mm².
Each big consumer has its own fuse. I.e. the starter
engine need a 150 A fuse, but it should have a fuse. The
electrical distribution panel can have a 40 A fuse.
Fuses of type MIDI would be enough for the most installations.
With this configuration you can disconnect on battery pair for i.e.
maintenance charge, while you live on the other batteries.
If there should be a short circuit in one cell, the fuse to that battery pair will blow, and you will not notice it.