## Hill consumption?

ttoshi
Posts: 15
Joined: Tue Jan 11, 2011 3:27 pm

### Hill consumption?

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

TomT
Posts: 10642
Joined: Sun Aug 08, 2010 12:09 pm
Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: California, now Georgia
Contact: Website

### Re: Hill consumption?

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.

planet4ever
Posts: 4674
Joined: Sat Apr 03, 2010 9:53 pm
Delivery Date: 02 May 2011
Leaf Number: 1537
Location: Morgan Hill, CA, south of San Jose

### Re: Hill consumption?

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.
End of April 2013: Traded my 2011 SL for a 2013 S with charge pkg.

ttoshi
Posts: 15
Joined: Tue Jan 11, 2011 3:27 pm

### Re: Hill consumption?

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

EVDRIVER
Moderator
Posts: 6687
Joined: Sat Apr 24, 2010 7:51 am

### Re: Hill consumption?

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.

garygid
Gold Member
Posts: 12464
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

### Re: Hill consumption?

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
Posts: 1500
Joined: Fri Apr 23, 2010 6:44 pm
Delivery Date: 08 Jan 2011
Leaf Number: 0175
Location: Oceanside, Ca.
Contact: Website

### Re: Hill consumption?

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.
JimmyD
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garygid
Gold Member
Posts: 12464
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

### Re: Hill consumption?

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
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
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abasile
Posts: 1922
Joined: Thu Sep 02, 2010 10:49 am
Delivery Date: 20 Apr 2011
Location: Arrowbear Lake, CA

### Re: Hill consumption?

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.)

Randy
Moderator
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Joined: Thu Apr 22, 2010 12:29 pm
Delivery Date: 04 Jan 2011
Leaf Number: 0191
Location: San Diego, CA

### Re: Hill consumption?

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....