Isolate the DC side of a solar array
Switching the DC isolator off and padlocking it: the inverter display reads DC 0 V. The DC LIVE signs stay because the panels are still live in daylight.
Try this in the lab: Site survey: name every part and every isolation pointAbout the Solar and EV lab
Transcript
The DC isolator is switched off and padlocked. The inverter display reads DC 0 V on its side of the isolator. The DC LIVE signs stay, because the panels on the roof are still live whenever there is light.