We have a MUMM 36 racing sailboat, with some pooched AGM batteries.
We have ordered two Lithium batteries:
One small for starting (dedicated)
One 100Ah for house
House runs basically run the electronics, cabin lights, and nav lights.
We typically do long distance overnight races, charging every 8-12 hours with a 55 amp standard alternator.
To charge the Lithium when underway, I have purchase a 12/12-30 DC-DC Charger from Victron.
Hopefully you can read this diagram!
The only thing not on the diagram are 60amp fuses at the positive battery posts.
There are 3 existing single pole battery switches that isolate the start and house batteries.
We never operate these switches when underway.
Should the Smart TR charger be cabled directly to the batteries, or on the other side of the isolation switches so it is closer to the alternator?
NOTE: also installing a Smart Shunt, but it is back ordered with our supplier.