Magnum MMP250-30D Question

I'm getting read to instal a MMP250-30D in a friends houseboat. I have a question that hopefully can be answered here. The question revolves around AC inputs. While in the slip, the boat is plugged into shore power. Additionally, there is a generator on board the boat. Here's the question - Can I wire the MMP250-30D as a Dual In/Single Out by having the shore power wired to AC1 in and the generator wired to AC 2 in? Would this work or do I need a transfer switch?
Dave
Dave
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Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter