Charging Back-of House Power Stations: DC-DC Converter versus DC-AC-DC Inverter

Hello,

Looking into wanting to charge up my EcoFlow Delta 2 faster than my 12V cigarette lighter can output (which is a max of 100W/h). After some research I found you can install a DC to DC converter that will feed off the house battery/alternator and charge at 400W/h. But then I also came across some threads where people were questioning the complexity and cost of installing a DC to DC Converter when you can do the same thing with a DC-AC-DC Inverter for much less, and with the added benefit of having AC available for any other needs should the EcoFlow be drained. One poster on a separate forum noted down the Pros and Cons as such:

DC-DC
Pros:
can run in tandem with shore
more efficient
no ac selector switch needed

Cons:
Lower Power Output
Cost more
Larger Wires
Standalone setup


DC > AC > DC
Pros:
cheaper
smaller wire
charge rate controlled by victron
backup AC inverter

Cons:
less efficient
ac selector switch needed
can't run in tandem with shore.

Although to the last point, I did learn that with Victron units you can run a DC>AC>DC system in tandem with shore power.

Trying to decide what makes sense here. Thanks in advance to many of you who understand this stuff waaaaaay better than I do

 

Why not get the adapter ecoflow makes for this?

https://us.ecoflow.com/products/800w-alternator-charger

 

It’s a good choice, but silly at $600, and too much at $400. I got mine for $200, definitely worth that

 

Yes, thank you, I did see that EcoFlow has their own version of a DC to DC converter. It is very expensive for what other brands can do much more cheaply. Regardless, it IS a DC to DC converter and I’m curious to know if an AC>DC>AC inverter is a better option, and if not, why?