Nubo wrote: ↑
Fri Dec 18, 2020 10:14 am
lorenfb wrote: ↑
Thu Dec 17, 2020 7:41 pm
You're not going to notice a headlight brightness change with just a volt to 1.5 volts change in battery voltage.
Oh, you definitely would, IF the voltage change was reaching the bulbs. Incandescent bulb output is highly voltage dependent.*
Headlights in many vehicles are strangled by resistance from too-thin wiring. I keep meaning to try rewiring the LEAF's high-beams but I hardly ever use them.
*I learned this empirically when I was a kid. My dad had a vehicle with electric windows (fancy at the time), and riding in the back seat I noticed if I activated the motor to "close" the already-closed window, the headlights would dim. If I stretched myself out to operate both windows at the same time, the dimming was quite noticeable. For months my dad thought the car's electrical system was on the fritz as I made the lights dim and brighten randomly. I finally had to confess as he was getting ready to take it in for repair
Yes, there's an obvious change of lumens (dl) per voltage change (dv), but at what dl/dv can the eye detect/perceive a change
and at what level of ambient light. A perfect example is Lefti's testing of a Leaf's battery voltage change with the wipers on
by monitoring the headlight brightness change, i.e. he saw no detectable brightness change and assumed that the voltage
didn't change. So given the number of tests for battery voltage change with the wipers on, it's now a known fact that the
battery charging voltage changes with the wipers being on. Conclusion; The eyes make a poor detector for a small dl/dv.
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F