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Originally Posted by FW28z
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AKA the K.I.S.S. principle.
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Agree, although what is simple for one person may not be ideal for someone else -- either too simple or not simple enough. I like your idea of a manual disconnect switch; and if I had two 12-Volt house batteries wired in parallel, would prefer the model that allows connecting Battery #1, Battery #2, Battery 1+2, or OFF to house loads.
That switch may not be quite as simple as an "ON-OFF" (don't know what's in picture) but allows checking condition of each house battery under load on regular basis. Otherwise you could have a bad battery and not even know it, or suspect it but not know which one it is.