Parallel Batteries to Solenoid

[pangolin]

Doesn't the blue sea acr act like a switch? My impression (limited understanding) is the the acr does these things
Separates the batteries during starting
Separates the batteries when engine is off
Combines batteries when engine is on
Combines batteries when charging

So the only thing it doesn't do is allow combining batteries for starting. However I could manually switch the batteries if I am stranded.

Do I have this right? Are some of you saying to also add in the manual switch or have a manual switch instead of the acr?

 

[bruceb58]

Everything you are thinking is correct. On both my boats, I have the switch as well as the ACR. You could conceivably flip the switch to charge while you are running but you better not forget to switch it when you stop. Way easier with the ACR and not having the switching back and forth game.