Quantum WiFi Power Wiring

Hi, I am using a Q24W with an E7D via WiFi. In the manual it says it can be wired dircectly to the battery (fused, obviously). I have done this as the nearest switched power source is quite a ways from my radar dome. I am wondering what the power consumption is when the display is off and radar is off? I have shore power and a charger so it’s not a big deal, just curious.

Also, do I have to turn the scanner off when I power off the e7d, or does it “know” the display is turned off?