48V to 12/48V charging?

[aybabtme]

With 48V propulsion banks becoming more common, and with the assumption that the 48V bank would come with a 12V circuit for legacy loads, and that the 48V bank is much larger and thus receives the charge of all power sources... where are the 48V to 12V battery-to-battery chargers?

Here's the layout I have in mind:

• a large 48V LFP propulsion battery
  • solar/mppt charger
  • hydrogen charger
  • inverter/charger
  • directly powers compatible 48V high DC loads (not many yet)
• a small 12V starter battery (to power high amp loads like windlass)
  • kept charged up from 48V bank
  • runs lights, LEDs (small load)
  • runs electronics (small load)
  • runs windlass, winches (high load, requires starter battery)

Similarly, if I have a large propulsion bank on my boat and a smaller one for the electric outboard on my dinghy. Need a 48V to 48V battery charger. Where are they?

It seems like the big manufacturers all have a 48V blind spot.