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Note this is a companion to the Is Solar Mandatory article
Death and taxes are mandatory. Gravity is mandatory.
In many/most situations direct-charging the house bank with a combiner (relay, isolator, VSR) is both effective and inexpensive. Even with lithium banks.
Having said that, there are scenarios where one may want to disable the combiner.
In this case DC-DC won't help with Absorption duration2) but it can help with Absorption voltage.