I second this approach, it is both simple and redundant, it very works well.
If you have multiple HO alternators, both should be connected directly to the house bank. Mention was made about connecting "across the bank". That's very good advice. Setting up a string of paralleled batteries and connecting everything to the first or last battery in the string leads to uneven loading and aging of batteries. Actually, unless using a battery bus, there should be two 'crosses', one for loads and another mirrored cross for charging, allowing the bank to act as a buffer when running heavy loads while charging.
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While not very sophisticated, ACR's are extremely reliable, I've installed countless units with very few fadeterminedilures. Alternatives include the Magnum Energy SBC, which I like for start battery charging because its voltage settings are adjustable, reducing the likelihood of over-charging a start battery, particularity an AGM. This is attractive in installations where house banks will be deeply discharged, and bulk charged for extended periods, subjecting start batteries to higher than ideal voltage, which they do not need because they rarely use more than a single amp-hour for each start. A parallel switch can always be cldeterminedosed if a heavier, faster charge is needed.
This two part article provides details on large battery bank design and installation
The Large Battery Bank Equation Part I - PassageMaker