"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"
That's what my system does by the use of a simple time delay relay (NOT fancy schmancy voltage sensing device) that doesn't close the normally open isolation relay UNTIL TIME PASSES which allows the alternators full undivided output to charge the engine battery so it recovers to some extent BEFORE it closes so the alternator charges BOTH the engine and house batteries. HOWEVER as soon as the engine is shut off the relay is open so there's no drain whatsoever on the engine battery when I use 12 VDC appliances in the RV.
Also, my house batteries are true deep cycle units while the engine battery is a conventional type and I (like John it appears) don't like them to be connected in parallel until the engine battery drops voltage. I prefer my deep cycle batteries for RV use ONLY and my engine battery for the engine ONLY. My system accomplishes that plus what you were talking about and is cheap easy and simple. IM KEEPING IT AS IS AND NOTTTTTTTTTT GOING TO USE ANY VOLTAGE SENSE DEVICE THAT KEEP HOUSE AND ENGINE BATTERIES TOGETHER.
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