New batteries in the van (1994 Ford EB with 7.5L V8) leads me to look to upgrade my charging system to take better care of them. Went from FLA to AGM and my old MPPT charge controller was not configurable, so I've upgraded that to a Victron MPPT that I can set my bulk and float explicitly on.
Next step is DC to DC charger, 3 stage programmable to better take care of the batteries on long drives. I've liked Victron a lot (off grid cabin, boat) so most likely going to stick with that brand:
https://www.victronenergy.com/dc-dc-converters
My two big questions are:
1) Isolated or non-isolated? I can't necessarily wrap my brain around what the isolated gets me over the non-isolated. I can see that the install of the non-insolated would probably be a lot easier (I have a nice big positive feed already wired to under the gaucho to charge the house batteries, but no corresponding nice fat ground wire, would have to run that back to the engine compartment if I went isolated).
2) Sizing? I don't want to fry my alternator with too much demand. I don't know what alternator is in there, I believe it's the high output so 130A instead of the standard 95A. Would a 30A charger like this:
https://www.amazon.com/Victron-Energ.../dp/B086Q8YNJZ
... be too much if the batteries are quite depleted? Not lithium so shouldn't be sucking huge power but would I be safer with 15A?
https://www.amazon.com/Victron-Orion.../dp/B086KWWK44
Would be sort of a bummer to pay same amount for half the output, but the whole point is to not cook anything (batteries, alternators etc), and from my reading you can't derate the 30A to put out less power you have to buy a 15A if you want less watts out.
Thanks in advance,
-- Bass