It's funny Doug your choice of the word "normal." For a rig that was claimed to be the most tested worldwide, including in temperatures so cold that it must make your locale right now relatively look like walking on the sun, you'd think that their two battery ESS design would have involved a big enough battery/alternator and suitable threshold for ESS to engage that wouldn't have some little sneeze like seeing your breath in the air cause it to not work...I think. Testing includes deliberately not using the rig on occasion to simulate storage conditions all too common for JL drivers spending less time behind the wheel.I’ve noticed this as well if I don’t dive the jeep for several days. I drove it only a few times last week and it took pretty much all weekend of driving for ESS to be enabled. Was probably 2-3 hours of total driving. I’m wondering too If the colder weather may be exacerbating it. It’s been like this since day one. So I tend to think it’s normal...
As you may know, many ESS systems use one battery. I don't fault FCA for using two. In fact it was probably a good decision given on the extra energy drawing accessories rig owners might have going doing an ESS event (extra lights, etc.)
I just don't think trickle charging or riding 50 miles/day if you don't need to should be what's needed to keep the ESS system going.
Many people hate ESS and that's fine, but at the end of the day it should be the owner's choice whether to engage the system, not the rig's limitations.
But it is normal in that lots of people report the OP's problem. : - )