Recommended inverter switch + setup for 2 batteries?

[photographer]

I would like to charge two batteries in my boat. I have a 115hp Yamaha outboard. I would like to have both batteries charged while out to make sure that I don't get stuck out on the ocean.

Do they batteries have to be the same capacity/type?
Which inverter switch do you recommend?
Can you help me how to set up the batteries wit the switch?

THANKS so much!

 

[NicoPags]

No Title

Buy an ACR and Battery Switch from iBoats and do this