ttoshi
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Hill consumption?

Thu Jan 13, 2011 3:55 pm

I live on top of a hill and am curious how much juice we will need to consume to get home. At the end of my trip I will need to climb about 1000 ft in 2 miles. Has anyone climbed roughly 1000 ft in elevation and how much energy did that require?

My wife's commute is about 25 miles each way, and she has 115V charging at work, so I'm not worried about range, but it would be good to know how much energy to leave before I get home.

Our car is scheduled for a March delivery. I hope it holds!

Toshi

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TomT
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Re: Hill consumption?

Thu Jan 13, 2011 4:13 pm

The general rule of thumb is that one mile of hill climb equals three miles of level, assuming a 6 percent grade. You are more like 10 percent so I'd guess it would be something like 10 miles in your case.
ttoshi wrote:I live on top of a hill and am curious how much juice we will need to consume to get home. At the end of my trip I will need to climb about 1000 ft in 2 miles. Has anyone climbed roughly 1000 ft in elevation and how much energy did that require?

My wife's commute is about 25 miles each way, and she has 115V charging at work, so I'm not worried about range, but it would be good to know how much energy to leave before I get home.

Our car is scheduled for a March delivery. I hope it holds!

Toshi
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
2019 Model 3; LR, RWD, FSD, 19" Sport Wheels, silver/black; built 3/17/19, delivered 3/29/19.

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planet4ever
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Re: Hill consumption?

Thu Jan 13, 2011 4:47 pm

See Leafer's analysis here.

Roughly, to be safe, assume an extra 1.5kWh per thousand feet in addition to the normal usage for the miles covered. I think that's more useful than what mogur suggests, because it is independent of steepness.
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ttoshi
Posts: 15
Joined: Tue Jan 11, 2011 3:27 pm

Re: Hill consumption?

Thu Jan 13, 2011 4:59 pm

planet4ever wrote:
Roughly, to be safe, assume an extra 1.5kWh per thousand feet in addition to the normal usage for the miles covered. I think that's more useful than what mogur suggests, because it is independent of steepness.
Great, so assuming 24kWh/100 miles, this is 5.4 miles for 1000 feet of climbing, +2 miles of normal distance, which would be roughly 7.4 miles total energy consumption.

--Now what is the regeneration efficiency? If I assume 5.4 miles of potential energy, then 5.4% of 100 miles total distance could potentially be recovered. Should I assume 50% regeneration recovery or maybe less? It will be fun to test out. We could start with a 98% charge (if you can tune the charging to that level) and see if we can get to 100% near the bottom of our hill...

Thanks,
Toshi

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EVDRIVER
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Re: Hill consumption?

Thu Jan 13, 2011 5:08 pm

Charge to 80% not 98. You will not get a 1/1 ratio and since the LEAf does not have very powerful regen longer regen grabs vs shorter stops will yield more. Any EV is capable of as much regen as it has output but the LEAF has been limited form the full 80 kw. Just experiment a bit on the downhill.

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garygid
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Re: Hill consumption?

Thu Jan 13, 2011 5:22 pm

On steeper downgrades, the LEAF's maximum Regen will not keep the car from gaining speed, so one will need to "burn" energy in the disc brakes.

On more moderate slopes, the Regen might be sufficient, but it is not yet clear (to me) just how much Regen one can get (maybe rather little) without beginning to "burn off" energy in the LEAF's disc brakes.
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Jimmydreams
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Re: Hill consumption?

Thu Jan 13, 2011 5:24 pm

garygid wrote:On steeper downgrades, the LEAF's maximum Regen will not keep the car from gaining speed, so one will need to "burn" energy in the disc brakes.

On more moderate slopes, the Regen might be sufficient, but it is not yet clear (to me) just how much Regen one can get (maybe rather little) without beginning to "burn off" energy in the LEAF's disc brakes.
Gary...

On the little hills here in San Diego, I get about max 10kW regen, maybe a little more. I never see it max out at 30kW unless I'm using the brake as well. I think you'd have to be on a pretty steep hill, use N to gain speed and THEN ask regen to slow you down before you'd max it out and be forced to use the brake.
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garygid
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Re: Hill consumption?

Fri Jan 14, 2011 8:12 am

You saw 10kW in ECO-mode foot-off Regen?

I have seen 18 kW using the brake, but it was probably in D-mode.

If gentle braking just added Regen, that would be great.
But, it is not clear when the discs start "eating" energy, right?
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
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abasile
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Re: Hill consumption?

Fri Feb 11, 2011 3:54 pm

So, have any LEAF owners tried driving up a "real" mountain yet? (i.e., Mt. Wilson, Mt. Palomar, Mt. Lemmon, Mt. Hood, Mt. Baldy, etc.) If yes, what was the distance and elevation gain? What was your approximate power consumption? (Yes, we've estimated what the consumption "should" be, but there's no substitute for hard data.) How much regen did you pick up on the way down? Did the battery temperature become a concern?

Thank you. (As I live on a mountain, I'm hoping for some data before my Blue SL-QC delivery date, which seems likely to be in May or perhaps as early as April.)

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Randy
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Re: Hill consumption?

Fri Feb 11, 2011 4:22 pm

I frequently go down Mission Village Drive into San Diego's Qualcomm stadium. I max out the regen to 30kW in ECO mode simply by coasting down the hill. Sometimes I have to use the brakes to stop at the bottom, but 30 kW is all you get....

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