[Electric Boats] An Electrical question on a boat

 

Since I only got a "because" answer elsewhere I thought I would ask this question here.
I dedicated a single battery from the genset. Before it was from my house pack and was causing all kinds of problems with the electronics on start-up. I isolated the ground and power only from the genset but was told I needed to combine the grounds. Since the Genset is used exclusively to charge the propulsion bank on long runs and the alternator is used just for the Genset battery. Why would the grounds need to be combined?

Now I'm thinking of installing a Xantrex Echo charger to run from the house bank to the genset battery. Does there need to be a ground connected between the 2 batteries?

Thanks,
Steve
410SE Lagoon Electric Cat

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