You want to size the fuses
and the switch correctly, and you want a way to monitor
state of charge for the second alt and battery system. Lastly, you want a way to shunt power from that battery to the main panel (again, properly fused) or the house bank in an emergency
, which I presume is part of why you are doing this.
There's a number of ways to set this up, of course. It depends on your end goal. I've decided (so far!) to have two alternators feeding into a large (1000 Ah) house bank, which in turn feeds via an Echo Charger
to a start battery. I will have an entirely separately charged winch
battery forward that will have a combination of switchable echo charging
, and charging
via genset...I'm doing this to avoid a long, expensive run of cable forward (it's a manual and electric
The side benefit of this is that I will have a customarily fully charged battery that I can haul back to the engine
bay if I have a catastrophic failure of the house bank.
40 South's suggestions are therefore of interest to me.