Incredible efficiency when it’s all downhill…

[June Bug]

Found this amusing, and thought I’d share:

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[Grumpy2]

That was quite a hill. We don't know exactly how efficient the regeneration is, but some believe it is about 50% of energy. Did you repeat the trip uphill to compare?

 

[June Bug]

That was quite a hill. We don't know exactly how efficient the regeneration is, but some believe it is about 50% of energy. Did you repeat the trip uphill to compare?

Great question. Yeah, I am up and down that stretch on a regular basis, but that uphill leg is generally at the end of my trip, and not the beginning. I will try to take note of the efficiency on the way back up the next time I drive it and post it here. It generally takes about 13% of my SR battery. Edit: a little math; I suppose that puts me at about 1.6 if I’m not mistaken.

 

[Grumpy2]

You were stopped when you took your photo. If you can stop on the way back long enough to turn the truck off briefly it will reset the "this trip" and you will have the uphill data on the screen.

 

[pullinggs]

Come on, what's the big deal? I get that kinda mileage all the time while driving everywhere at 90 MPH. Doesn't everybody???

OK, seriously, pretty cool. My normal drive starts with a 3500' elevation drop over about 25 miles, so I see anywhere from 4-6 mi/kWh all the time on that stretch. The mental picture of the hill that you're driving to get your result is... kinda ski jump-scary.

Humbly asked, permission to hijack your thread just a little bit? Always wondered about this:

Say you start on top your mountain at 100% SOC and head down the ski jump ramp. What does the truck do with all those regenerated electrons that won't fit in your already-fully-loaded battery?

 

[TaxmanHog]

Say you start on top your mountain at 100% SOC and head down the ski jump ramp. What does the truck do with all those regenerated electrons that won't fit in your already-fully-loaded battery?

I believe the regen controller phases back and the truck applies friction brakes to protect the battery pack from overcharging.

 

[Danface]

I had a similar experience coming from the Cog Railway Station for Mt Washington NH (2700 ft) to North Conway (500 ft). I got about 1.6 "to the top" and about 3.8 "at the botton" with some 20's and higher at spots. At the time I was a bit worried because it was going to be close if I didn't get the what I got on the return leg (and no NACS adapter for fast charging in North Conway ... NH is not very EV friendly ... "Live Free or Die" ya know )

 

[Nikos]

Found this amusing, and thought I’d share:

These the kind of numbers I get also coming down from the Blue Ridge Mountains, BRP, to my home in the Greenville SC area. Going uphill is a different situation. I usually had my wife on the edge of her seat looking the screen wondering if we had enough of a charge to come home.
She was impressed that we were coming down the mountains generating electricity. Range anxiety….gone.!!!!

 

[Danface]

These the kind of numbers I get also coming down from the Blue Ridge Mountains, BRP, to my home in the Greenville SC area. Going uphill is a different situation. I usually had my wife on the edge of her seat looking the screen wondering if we had enough of a charge to come home.
She was impressed that we were coming down the mountains generating electricity. Range anxiety….gone.!!!!

Thank you gravity!

 

[climateguy]

I thought I was doing great when I saw 10 mi/kwh coming down Mt Lemon in Arizona. Just to see how hard these things are to photoshop, I dreamed up this:

 

[21st Century Truck]

Back in 2013 while descending Pike's Peak, Colorado in our son's Ford Fusion Energi hybrid plug-in sedan, we saw its then-large traction battery register a range estimate of around 40+ miles on the IPC screen. Of note, the 2013 Fusion Energi had an actual battery-driven range of about 18 miles or so.

Sonny Boy got very excited: "Dad, we can make it back all the way to Denver!". I just smiled, and the Fusion Energi's range estimate on the IPC screen of course just melted away when we hit the flat roads below the mountain.

To the question about how the excess electric energy might be disposed of during such descents: I remember the heat sink function of Zener diodes on my former motorcycles back in the 1980s and 1990s... maybe the Lightning also has a Zener diode or two hidden somewhere.

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