I am thinking of using a DC to DC smart charger
to ensure bow thruster batteries
get a proper charge. Is this a reasonable solution?
Currently the bow thruster batteries
(2x12V batteries in series) get charged from the 24V house batteries through a VSR. The problem is that when I arrive in a marina and have been using the thruster, the house batteries a frequently fully charged from motoring.
This means that the now depleted thruster batteries wont get a proper 'bulk' charge through the VSR when I put the house bank onto charge (as the house batteries go quickly to 'float' being fully charged).
It seems that I have two options. Install a separate battery charger
for the thruster batteries, or install a DC to DC charger between the house and thruster batteries. I would prefer the second option for simplicity, but would need to keep the VSR between the house bank and the DC to DC charger to avoid the risk of drawing the house batteries down in the case of a shore power
I have not used DC to DC chargers before and am concerned about the "unintended consequences". So I am wondering whether this is good practice or not.