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I like/have the two battery set up but would only install the Blue Sea Dual Battery Plus with an ACR. Look on their website for the specs, schematics, and how it works. What the Blue Sea does automatically the Perko requires diligent owner operator use and understanding. That being said.....do trace or uncover the culprit for draining the battery. A well designed single battery system for the size of your hull would be adequate, I happen to like a hard wired second battery for various reasons on my boat (separates electronics, built in jump, etc....). My boat is also 22' with a cuddy.
Garris