LDB415
Posts: 53
Joined: Sat Jun 08, 2019 4:00 pm
Location: Houston suburb

Charging questions

I live about 1.5 miles from this location. There are 4 different locations around the mall actually, all with similar J1772 connections. I've read it's best not to completely charge or discharge so if I were to try to stay within a 25%-75% range and plugged into one of these at 25% about how long would it take to get to 75%? Also, can you sit in the car with it on and the a/c running while it charges? I realize it would take a bit longer but it can be unbearably hot at times. Finally, what, if anything, am I not yet educated enough to know to ask here and should know about? Thanks for any and all input.

https://www.plugshare.com/location/313897
Researching possible 2022 SV 40 Tech purchase
LeftieBiker
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Re: Charging questions

Welcome. What is it that you want to charge, exactly? We need to know the year and model of the EV (like "2019 Leaf SV+") in order to know the battery size and thus the length of time to charge to 75%. Even then, since Level 2 charging stations can vary in power output, we can only give a rough estimate. As for your other question, yes, you can run the A/C while charging: just turn the car off, plug it in, then start it back up and run the A/C as normal. The good news is that running the A/C uses much less power than running the heater, so it won't slow charging a lot except maybe in extreme heat.
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LDB415
Posts: 53
Joined: Sat Jun 08, 2019 4:00 pm
Location: Houston suburb

Re: Charging questions

Yes, I definitely dropped part of that. I'm looking at a 2022 Leaf S 40. The charging points all are marked 8.32kW. I don't know enough about any of this yet to know exactly what that means as far as charging speed/time.
Researching possible 2022 SV 40 Tech purchase
Learjet
Posts: 267
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Leaf Number: 309454
Location: Louisiana, USA

Re: Charging questions

I get about 10% per hour increase on a 6.6 kW EVSE...you should do better with the smaller batter.

Yes you can run the AC, it will reduce the charge rate slightly.
2019 Nissan Leaf SL Plus
Build Date 2/19...car sat new for 1 year until I purchased 3/20
Learjet
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Re: Charging questions

LDB415 wrote: Sun May 29, 2022 5:19 am Yes, I definitely dropped part of that. I'm looking at a 2022 Leaf S 40. The charging points all are marked 8.32kW. I don't know enough about any of this yet to know exactly what that means as far as charging speed/time.
your car will charge at 6.6 kW on a J1772. That is the limit of the built in AC to DC converter.
2019 Nissan Leaf SL Plus
Build Date 2/19...car sat new for 1 year until I purchased 3/20
LDB415
Posts: 53
Joined: Sat Jun 08, 2019 4:00 pm
Location: Houston suburb

Re: Charging questions

Ok, so how far off am I in my uneducated speculating? If the car is 40kW and I'm running 25-75% that means I charge when it hits 10kW remaining and charge until it has 30kW charge? And if it charges at 6.6kW that means roughly 3 hours to get the 20kW needed?

And is 25%-75% the range to be aimed for or is it ok to run a broader range, 20%-80%, 15%-85%?

And is it linear? IOW, if I ended up getting a plus with 62kW would everything just be adjusted up ~50%?
Researching possible 2022 SV 40 Tech purchase
alozzy
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Location: Vancouver, BC
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Re: Charging questions

The math is actually pretty straightforward. As mentioned before, you can expect to get full L2 charging rate at pretty much any starting state of charge as L2 charging is pretty linear regardless of the pack size.

This formula will get you the time in minutes to add y number of kWh to the pack:

time in minutes to charge = (y kWh x 60 mins/hr) ÷ 6.6 kW

So, if y is 1 kWh, then expect charging to take about 9 minutes. Also, each kWh of energy adds about 4 miles of range (this varies a lot based on driving conditions, but it's a decent ballpark number).

For simplicity sake, I round up the charge time per kWh to 10 minutes. So, if you plan to eat lunch at a restaurant while charging for 30 minutes, you'll know you'll have added roughly 3 kWh to the pack (and added roughly 12 miles of range).
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LeftieBiker
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Re: Charging questions

A 70-30% state of charge (SOC) range is good for Summer. In Winter, when heat uses a lot of power and the battery isn't usually in danger of overheating, you can do 30%-80%. You can also charge to 100% anytime the battery isn't already hot, as long as you drive the car within an hour of the charge ending in Summer, or several hours later in Winter.
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jlv
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Re: Charging questions

LDB415 wrote: Sun May 29, 2022 7:48 am Ok, so how far off am I in my uneducated speculating? If the car is 40kW and I'm running 25-75% that means I charge when it hits 10kW remaining and charge until it has 30kW charge? And if it charges at 6.6kW that means roughly 3 hours to get the 20kW needed?
Corrections:
the car is 40kWh
10kWh remaining and charge until it has 30kWh charge
if it charges at 6.6kW that means roughly 3 hours to get the 20kWh needed
kWh is a capacity. kW is a rate.
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Flyct
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Re: Charging questions

LDB415 wrote: Sun May 29, 2022 3:12 am so if I were to try to stay within a 25%-75% range and plugged into one of these at 25% about how long would it take to get to 75%? Also, can you sit in the car with it on and the a/c running while it charges?

https://www.plugshare.com/location/313897
Since you updated that you bought a Plus, it will take about 5 hours to go from 25%-75% with a L2 charger. That’s a long time to sit in your car waiting for it to charge. Rule of thumb 1 hour of L2 charge will get you about 25 miles of range.
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