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Sounds like you learned the lesson of NEVER trusting anything coming out of a sales person's mouth concerning a PDI. They also are usually not the slightest bit familiar with what they are selling and can't answer questions about specific things - so they BS instead.
For a residential ref., you probably do need two good deep cycle batteries. The battery cut off switch doesn't completely isolate the batteries, but they won't charge when it's turned off, nor will your inverter be powered. The ref. wasn't staying cold because it was only being powered when you had shore power since this switch was off. Like Eddie, I leave ours on all the time (but I do have a master disconnect that totally isolates the battery bank of 4 T105s when I've need it).
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