This is an old revision of the document!
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.
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.