OK, thanks... But then, of course, you need to charge that 12V Aux battery... How are you doing that (beyond the Alternator)?I have the 40A Victron which is enough to cover most everything. That is on a custom ideal diode in parallel with a small lead-acid battery/charger. That way, if anything goes over the limit of the converter - the battery effectively supplies a boost. This required me to trim the converter to be slightly higher voltage than the battery float voltage.
If/when I have to shutdown the 24v battery bank - the little (backup )battery is still enough to pull in the slides, run the water pump, etc.