bonro001
Posts: 7
Joined: Mon Feb 20, 2017 6:13 pm
Delivery Date: 21 Feb 2017

Charging rate questions

Sat May 27, 2017 2:05 pm

Hello all, have been thinking about charging quite a bit, and heat since I live in Texas. I commute with my leaf about 20 miles a day (early morning, afternoon)

I have the charge point charger, 15 amps I believe, installed and also the 110 volt charger. Have never needed a charging station away from the home.

To the question. Since I get home around 5 in the afternoon, I have 13 hours before I usually need the car again. Which would be better on my batteries:

1. Set the charging timer to be ready at 6 AM with the 15 amp charger. This lets the batteries get nice and cool and charges overnight, starting around midnight, to the cool part of the night.
2. Use the 110 volt charger and start charging when I get home. I suspect that this would have the car charged in the 12 hours overnight. Would charge when the car is hot, but at a way slower rate.

Boy I wish there were a 'charge after it's cool' timer!

Thanks in advance for any thoughts on this!

Rob

alozzy
Posts: 524
Joined: Fri Jan 20, 2017 4:25 pm
Delivery Date: 18 Jan 2017

Re: Charging rate questions

Sat May 27, 2017 2:49 pm

Option 1
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
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LeftieBiker
Posts: 6554
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Charging rate questions

Sat May 27, 2017 3:19 pm

Yes, letting the battery pack cool is best. And the only "charger" involved is the one built into the car. You have a "charging cable" and a "charging station." Both are what is known as an "EVSE." That's a device that supplies the onboard charger with house current - either 120 or 208 to 240 volts.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

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bonro001
Posts: 7
Joined: Mon Feb 20, 2017 6:13 pm
Delivery Date: 21 Feb 2017

Re: Charging rate questions

Sat May 27, 2017 5:47 pm

On the option 1 comment, is there a reason that the 15 amp version would be better on the batteries?

sub3marathonman
Posts: 304
Joined: Wed Nov 03, 2010 11:57 am
Delivery Date: 31 Mar 2012
Location: Bartow, FL

Re: Charging rate questions

Sat May 27, 2017 6:01 pm

bonro001 wrote:On the option 1 comment, is there a reason that the 15 amp version would be better on the batteries?


Think of it like this, heat degrades the battery, high state of charge degrades the battery, put the two together and it isn't additive it is exponentially worse.

So the batteries have had a chance to cool until midnight, and charging is completely during the coolest time. In addition, bringing up the batteries at 15 amps has the added effect of leaving the batteries at a lower state of charge for a longer period of time.

As a final benefit, charging at L2 is more efficient than at L1 (110V ) due to the overhead losses inherent in charging.

bonro001
Posts: 7
Joined: Mon Feb 20, 2017 6:13 pm
Delivery Date: 21 Feb 2017

Re: Charging rate questions

Sat May 27, 2017 6:30 pm

Perfect, thank you for the explanation!

SageBrush
Posts: 844
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: Colorado

Re: Charging rate questions

Sat May 27, 2017 7:12 pm

Perhaps Texas is different from Colorado -- the coolest 3 hours of our day is early morning around 3am - 6am or 4am - 7am, depending on the season. If you really want to play this game, the car should be outside to be well ventilated underneath, and charging during the windy hours of the night would be an added bonus if the ambient temperature has already cooled down.
2013 Model 'S' with QC & rear-view camera
Bought off-lease Jan 2017 from N. California with 63.9 Ahr after 22k miles
Car is now enjoying an easy life in Colorado

rawlins02
Posts: 39
Joined: Sun Jan 29, 2017 2:30 pm
Delivery Date: 03 Feb 2017
Location: western Massachusetts

Re: Charging rate questions

Fri Jun 16, 2017 2:41 pm

SageBrush wrote:Perhaps Texas is different from Colorado -- the coolest 3 hours of our day is early morning around 3am - 6am or 4am - 7am, depending on the season.


Right. That makes sense. In most place and on most days, air temperatures near the surface (eg 6') reach a minimum just after sunrise.
http://apollo.lsc.vsc.edu/classes/met13 ... rend5.html

This based on a radiation balance. Obviously if there is strong horizontal advection of warm or cold air, minimum temperature can occur at a different time of day. Many people are surprised that air temperature is most often coolest that late in the 'early' morning.

DaveinOlyWA
Gold Member
Posts: 11792
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: Charging rate questions

Sat Jun 17, 2017 8:17 am

I would simply plug in the car right when I got up in the morning. This should easily cover you for several days. Eventually you might want to plug in over night or something to boost your SOC.

But I do get up with enough time to relax up to an hour before getting ready for work. Everyone who knows me thinks I am crazy especially when considering I have work start times as early as 4 AM with 6 AM being the most common. But that is me.

I generally drive a lot but there has been slow periods at work or simply jobs close to home and that is what I do. You might want to check on the speed of that Chargepoint but for a 20 mile commute, I only need to plug in an hour a day to cover that.
2011 SL; 44,598 miles. 2013 S; 44,840 miles. 2016 S30; 18,297 miles. 363 GIDs, Ahr 82.34, Hx; 100.00% kwh 28.1 QCs 165, L2's 190
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