I've noticed that the Jeep goes into "Battery Protection Mode" if its near freezing. Once it gets warmer that goes away and the ESS functions normally.
Unfortunately for me I think one my batteries is on its way out as my Jeep has been stuck on "battery charging" now even with higher temperatures.
Looks pretty good! You'll have to periodically touch up the job though. I have to take my Grille off soon and add a few layers to cover up some of the rock/big bug impacts that have worn through the plastidip.