You can set it to start charging at a particular voltage. There is also a shutoff timer you can set if you wish to have the charger turn off after a certain period of inactivity.
Not if you change it back to over 13v before you shut down.
I only change the voltage in rare cases where the Bronco BMS has dropped voltage to under 13v and I need to charge the Delta Pro. Otherwise, it leave the starting charge voltage at 13v.
I use the Ecoflow charger as well and have just changed the start voltage on the Ecoflow to 12.5v when I need it to fire up.
Firing up the A/C to max also brings the alternator to around 13.5v.
I just got a Prinsu Pro rack a couple weeks ago. My general impressions are good. Everything was packaged well, fit perfectly and went together easily. I didn't have to chase any threads and the fasteners are better than average quality.
It took nearly 6 weeks on the nose for it to arrive from...
Another option, and the one I'm currently leaning towards for my Badlands Nonsquatch are the Fox 2.5's.
https://ridefox.com/products/ford-bronco-2-5-performance-series-6678d984?year=2023&make=Make&model=Model
Most of my offroading (and 3.5 miles of the road to my property) is unmaintained...