Peer review my battery set-up and operating methods please.

[Skiwi]

Current set-up:
Dual identical "crank" batteries in parallel, each on a separate switch so I can select none, either or both for any purpose.

I currently use both on for everything when using the main motor, then switch one off (I alternate which one) when I start trolling on the auxiliary or when I'm parked up with accessories running. Then when I go to restart the main motor both back on. My thinking is to always have one fully charged battery on standby when I go to restart the main motor.

Proposed set-up:
Identical as above except switching one of the batteries for a deep cycle and using it as the dedicated accessory power source + sharing cranking duty.
While I realise cranking on a deep cycle is not ideal, I'm thinking because it will only share the cranking duty it won't fail much earlier than normal.??

The reason I want to leave the deep-cycle on all the time is to ensure the outboard tops it up when we are running and I hate the thought of flicking battery switches with the motor running (blown regulator anyone?)
I'm not sure my outboard is capable of fully charging the deep-cycle so I still intend to top up the deep-cycle off mains after each trip.

Please feel free to critique my thinking, I've got broad shoulders and a thirst for knowledge

 

[Lyle29464]

Re: Peer review my battery set-up and operating methods please.

Sounds like a plan if you charging system is up to it. Many outboards will not top you off unless you run for many hours at full bore.

Most battery switches connect before they disconnect so no problem there.
Be sure and test yours. just turn on something and do the switching.

Battery charger manufactures recomend you not charge 2 different types of batteries the at the same time. I do not know the answer as far as your outboard is concerned. Post some info on it. Your manual might answer the different type batterys question. I think most people just charge the house battery at home.