Hi Stu thanks for all your help! I have poured over all the material you have provided here and on other forums.
My scenario is where the starter and alternator
are connected via single
wire to common post on switch.
I have 2 house and will soon add a separate 3rd start/reserve battery.
If I leave the alt/start connection on common post of Off-1-All-2 switch and always leave switch on 1 (house and start), my new 3rd battery would function only as an emergency
reserve. The only disadvantage is the risk associated with switch turned to Off position while running engine
I would keep 3rd reserve battery charged with ACR.
My immediate goal and impetus for this project
of 200W solar wired directly to house. Time is ticking as we head
out soon and need to get solar up and running ASAP while minimizing work
and impact to existing system.
Do you see any other disadvantages with this scenario?
I will also consider exchanging my 2 x 12V G31 AGM's with FLA to avoid any potential charging
issues from ALT but will research