Installing 12V Bargraph Voltmeter with USB ports in RV

In this video, I install a 12V bargraph/digital voltmeter into an RV. The meter draws a miniscule 17ma when not using the USB ports, so it does not defeat its own purpose by adding much drain to the battery -- technically, it would take a year of continuous display to drain a 100AH RV battery (actually more, considering Peukert formulae, but let's not get nerdy... -er?).

Видео Installing 12V Bargraph Voltmeter with USB ports in RV канала GyroGearloose-HackingRVsCheap