rawlins02
Posts: 44
Joined: Sun Jan 29, 2017 2:30 pm
Delivery Date: 03 Feb 2017
Location: western Massachusetts

Re: Ran out of juice last night: a few questions about the trip

Mon Jul 31, 2017 4:59 am

LeftieBiker wrote:An even better way to ensure that you arrive is to drive conservatively at the beginning of the trip. Then, once you see that you easily have enough range to get home, you can finish the trip in a relaxed manner, driving normally. I now do this in Winter.


Agree. I do this often. But on this trip, the charge used on the way out (plus some recharge there) mislead me into thinking I had more than enough to get home. Always nice if the to/from legs use similar amount of charge. This time, the return consumed almost 1/3 more charge than the outbound leg. I hope to learn more about why on my next few visits to that destination.

rawlins02
Posts: 44
Joined: Sun Jan 29, 2017 2:30 pm
Delivery Date: 03 Feb 2017
Location: western Massachusetts

Re: Ran out of juice last night: a few questions about the trip

Mon Aug 21, 2017 5:46 am

Graffi wrote:For your next try at that trip limit your highway speed to 55 mph and let us know the difference. I think you will be very surprised at the result.


I made the trip again last week. I decided to take the Interstate highway, limiting speed. I averaged around 55 maybe 57 mph. Trip north was 43 miles and SOC went from 100% to 55%. That's about 9 kWh used, assuming my battery holds around 20 kWh. Makes sense, as the dash readout averages around 4.8 mi/kWh on highway trips at 55 mph. 43 mi / 4.8 mi per kWh = 8.96 kWh. Spot on!

On return I made it an additional 23 miles to a (free!) fast charger where SOC read 29%. It rained on that return leg. So, let's assume 4.7 kWh average for the 66 total miles to fast charger. 66 mi / 4.7 mi per kWh gives 14 kWh used. 20 kWh available in battery * 0.71 = 14.2 kWh. Close enough.

I made another distance trip a day later. I went 50 miles and used 60% of my charge (81% SOC to 21%). Return was 55 miles using 62% of available charge.

Looks like I'm getting excellent efficiency at around 70 degrees F in good weather. I'm thinking that if I were to use 95% of available (100% to 5%), I could go at least 88 miles at 55 mph, assuming 4.7 mi/kWh and 19 kWh used. My dash is reading 4.9 mi/kWh this month, with a combination of local and highway driving. Also, my odometer just crossed the 40,000 mark, with all 12 capacity bars showing (knocks on wood).

alozzy
Posts: 668
Joined: Fri Jan 20, 2017 4:25 pm
Delivery Date: 18 Jan 2017
Location: Vancouver, BC
Contact: Website

Re: Ran out of juice last night: a few questions about the trip

Mon Aug 21, 2017 1:53 pm

@rowlins02 Would you mind running the numbers on the EV trip planner site?

https://www.evtripplanner.com/planner/2-8/

Use the LEAF Beta profile and default values.

Some people say it's not that good, but I've found it fairly accurate. Would be nice to get more emperical evidence either way...

Thanks!
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV :D

rawlins02
Posts: 44
Joined: Sun Jan 29, 2017 2:30 pm
Delivery Date: 03 Feb 2017
Location: western Massachusetts

Re: Ran out of juice last night: a few questions about the trip

Tue Aug 22, 2017 6:15 am

alozzy wrote:@rowlins02 Would you mind running the numbers on the EV trip planner site?

https://www.evtripplanner.com/planner/2-8/

Use the LEAF Beta profile and default values.

Some people say it's not that good, but I've found it fairly accurate. Would be nice to get more emperical evidence either way...

Thanks!


I kept the default values, except for the speed multiplier, which I set to 0.9. Looks like the trip planer and my estimate agree pretty well. 9.2 vs 9.0 kWh.

Distance 41.7 miles
Driving Time 0:50
Charging Time 0:00
Total Trip Time 0:50
Total Energy Used 9.2 kWh
37 RM
Average Efficiency 220 Wh/mile
Net Elevation Change -66 feet

alozzy
Posts: 668
Joined: Fri Jan 20, 2017 4:25 pm
Delivery Date: 18 Jan 2017
Location: Vancouver, BC
Contact: Website

Re: Ran out of juice last night: a few questions about the trip

Tue Aug 22, 2017 8:22 am

Nice, thanks for doing that!

Does the reverse trip also match up well?
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV :D

rawlins02
Posts: 44
Joined: Sun Jan 29, 2017 2:30 pm
Delivery Date: 03 Feb 2017
Location: western Massachusetts

Re: Ran out of juice last night: a few questions about the trip

Thu Aug 24, 2017 1:43 pm

alozzy wrote:Nice, thanks for doing that!

Does the reverse trip also match up well?


Not quite as well for the ~23.5 leg to fast charger. I estimate I used about 5 kWh. evtripplanner says it should take 6.7. I may have been going slower that I thought. I'm likely to do the trip again soon, and if I do I'll again check my energy use against an estimate from evtripplanner.

Distance 23.5 miles
Driving Time 0:29
Charging Time 0:00
Total Trip Time 0:29
Total Energy Used 6.7 kWh
24 RM
Average Efficiency 284 Wh/mile
Net Elevation Change -33 feet

alozzy
Posts: 668
Joined: Fri Jan 20, 2017 4:25 pm
Delivery Date: 18 Jan 2017
Location: Vancouver, BC
Contact: Website

Re: Ran out of juice last night: a few questions about the trip

Sun Aug 27, 2017 8:54 pm

Thanks! This confirms that EV trip planner seems to be conservative and leaves some margin for error. I'm going to start using it more often.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV :D

rawlins02
Posts: 44
Joined: Sun Jan 29, 2017 2:30 pm
Delivery Date: 03 Feb 2017
Location: western Massachusetts

Re: Ran out of juice last night: a few questions about the trip

Fri Sep 01, 2017 4:34 am

Made another trip on that route. Energy use efficiency was outstanding. I used right around 8.8 kWh to go about 42 miles up and another 8.8 kWh coming back. evtripplanner.com says it should take about 10 kWh up and 11 kWh coming back. This with a speed setting of 0.9, since I drive about 55 mph on the 65 mph interstate. Not sure why software says it takes one more kWh coming back than going out. I used about the same amount of charge each way. So I'm averaging about 4.7 mi/kWh on the highway. Average for the month of August overall was 4.9. I'm pretty sure I could almost make that 84 mile round trip on a single full charge, since I used just under 90% total on that last trip.

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