[electricboats] Common DC ground with multiple banks

In my planned design I have two 48v propulsion Lifepo4 banks (one in each hull) and a 24v Lifepo House bank.

The propulsion banks will be grounded by their respective pod motor which will be fixed in the water.

How should I handle the negative cabling? Is it okay or advisable to have a single common negative bus which all banks negatives are connected to? 

The 24v house bank is quite far from the propulsion banks, and I plan to charge it with a simple isolated DCDC converter from each propulsion bank. In this case is it necessary to have a common ground between the two banks or can I essentially operate them as two separate systems?

any advice appreciated!
Jack

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