Yes, it makes sense. The relay delays connection of the house battery until the vehicle battery has recovered from the engine start. This reduces the load on the alternator. At the shut off point of 12.6 volts the vehicle battery should start the engine, no problem. This protects the vehicle battery from becoming deep cycled (discharged), therefore the engine will always start even though the house battery has been discharged.
If you want the vehicle battery disconnected at engine shut off you should be able to "trick" the relay by turning on the head lights or jogging the starter.
Note: my chart shows 100% charge at 13 volts for maintenance free, 12.7 volts for CX & YuMicron and 12.6 volts for convention batterys. From this your relay can expected to remain connected longer for some battery types.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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