What options exist for limiting current in this scenario?
I have been searching for an option and it looks like I need to reduce the field on the alternator but I don't understand enough to know if that will work on its own with a DC/DC charger.
At the moment the option seems to be to buy a DC/DC charger that does the number of amps I require (being 0.5C of the LiFePO4))
EDIT: Added information per question/comment
The charger is a CTEK Smartpass120S coupled with a CTEK250SE. The 120S does up to 120Amps in a "passthrough mode". And the 250SE does 20Amps as a proper DC/DC charger and has selectable profiles.
When the battery can take a current of over ~25amps both the 120S and the 250SE are engaged and "doing their respective things". Once the 120S detects that its current is below ~6amps it disengages and then the 250SE continues and applies a proper charging profile.
NB: Interestingly there is no actual digital connection/signalling between the two units. They work in tandem or stand-alone and are designed to work as a pair for up to 140Amps
I don't currently have a LiFePO4 battery connected, I am still using AGM, the most current I have seen my AGM suck up is 75amps, and it's allowed as much as it wants. However, I am migrating to LiFePO4 Cells and I know that they will take all 140AH if they can. So looking for a way to limit that so I have my charging system sorted.