Join Date: Feb 2008
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The short answer is no. If you are on dockside 120VAC, then skip the inverter, just plug directly into the shore power.
The current draw from the inverter will overwhelm your system. You will have to size conductors for the maximum current, (2500 w @ 12.5 VDC) which is enormous at 200 Amps. Engineering factor and voltage drop will push that value to nearer 250 Amps.
That current will melt your batteries, and they will run down into your bilge, where you will have to clean them out with a shovel. Obviously your engine alternator is hopelessly under sized - so no help there.
(Although your batteries are 100 ah, they will not put out 100 Amps for an hour. Nowhere near. So the "just for a minute" scenario won't fly, either.)
Either stay with shore power, or buy a genset that can deliver that kind of power. Sorry.