Charging bow thruster battery

[Huzie]

Hi there,

I have a Jeanneau 42.2 1995. She has 3 battery banks. Engine, Domestic and Bow thruster

We have Solar and Wind Gen but neither are connected to the bow thruster battery

I have an issue where we are rarely connected to shorepower and the amount we use the engine results in the battery going flat quite regularly

I am thinking of adding an isolated DC>DC unit between our domestic bank and the Bow Thruster battery.

Will this need its own cabling? If so do i just run cable with Amperage to match the DC DC

Sorry for my poor diagram!

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