Perko Switch off/1/both/2 and Yandina Combiner

[joshmon71]

Dual batteries, Perko switch. Batteries are brand new non deep cycle aka starting batteries I believe but will confirm (just got the boat this weekend). Verado 250 single outboard which likes da juice to start. I like to be safe when a bit offshore of Cape Cod. Goal-looking to charge both batteries while isolating running on one battery. Came across this Yandina C100 product:

http://www.yandina.com/NewCatalog.htm

Anyone else use it? For 75 bucks and 3 wires seems like a no brainer to me almost 2 good to be true right!? I was looking at a BSP system but the price was high, and seems overkill for my needs.

This way in "1" on Perko, the "2" battery is being charged and in reverse as well, run on "2" but "1" batterry is charged as well. Thoughts?

-Josh