Voltage drop

Another way to think of this is to compare to 120V systems. People sometimes dismiss "only 1/2 volt" in 12/ 14V systems but remember........

If you are comparing to 120V AC that is 5 volts. For some systems this is not much, for others it's a lot. When I grew up the "farm" voltage was often lingering on 105V. "Normal" was maybe 115. Back in the "tube" TV days, the whole famn damily would be watching something and the well pump would start. The TV would "pull in" the screen visibly and the lights would all dim!!! I've actually no idea how far the volltage drooped during pump start.