protonic
Posts: 22
Joined: Mon Aug 31, 2020 7:52 pm

Chargepoint Questions

Mon Aug 31, 2020 8:07 pm

Hello. I just bought a 2017 i3 (only 13k miles!) and have just installed my Chargepoint Home Flex. I used to make fun of these cars but now I'm driving one (I still make fun of the Prius). I installed this charger at my business and selected "home" during the Chargepoint app setup. For this reason, when I go through the settings for utility pricing I only see residential electricity plans. I called Chargepoint tech support but the lady I spoke with was clueless and did not offer any help (other than telling me to go through the settings and try again). Is there a way to correct this? I tried every link in settings and don't see an option for this.

I installed a 50 amp breaker along with 6 Guage wire. I see the i3 is only capable of 32 amp charging. Is it possible that the i3 may get some sort of firmware upgrade to charging speeds? Not that big of a deal for work since I am there usually all day.

Also, since I am only charging at 32 amps, that is all I'm being charged for by my power company correct? I'm a little confused on how this works since all my other equipment at work needs to have the correct size breakers and wire conductors.

Lastly, what speed are you guys showing for the last 20% charging. I'm showing 11 miles per hour. Is this correct?

Thanks!

Pahaska
Posts: 48
Joined: Thu Jul 30, 2020 11:49 am

Re: Chargepoint Questions

Tue Sep 01, 2020 4:50 am

You are only charged for the power you use. The size of the breaker has no bearing. on how many amps you are drawing. It just keeps you from exceeding the capacity of the wiring.

User avatar
MKH
Gold Member
Posts: 667
Joined: Fri Nov 02, 2018 5:48 am
Location: Dallas

Re: Chargepoint Questions

Tue Sep 01, 2020 8:57 am

Isn't there the option to enter in your electricity provider and rate info manually, from your bill?
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

JohnWasser
Posts: 68
Joined: Sat Mar 07, 2020 6:15 pm

Re: Chargepoint Questions

Tue Sep 01, 2020 10:03 am

protonic wrote:
Mon Aug 31, 2020 8:07 pm
Is it possible that the i3 may get some sort of firmware upgrade to charging speeds?
Highly unlikely. There would be little reason to put a charger capable of higher currents in the car without already using it.
protonic wrote:
Mon Aug 31, 2020 8:07 pm
Also, since I am only charging at 32 amps, that is all I'm being charged for by my power company correct?
Correct.
protonic wrote:
Mon Aug 31, 2020 8:07 pm
I'm a little confused on how this works since all my other equipment at work needs to have the correct size breakers and wire conductors.
The breaker and wiring rating sets the maximum you can draw. In the USA, a device can draw no more than 80%, which is why a 32A device need a 40A (minimum) circuit. You can always draw less than 80%.
protonic wrote:
Mon Aug 31, 2020 8:07 pm
Lastly, what speed are you guys showing for the last 20% charging. I'm showing 11 miles per hour. Is this correct?
"Miles of charge per hour" depends on your driving style. Kilowatts is a more useful measure. I charged on a Fast DC charger yesterday and it was going at 45kW until I reached about 95% charge. Look at the Chargepoint app to see the charge rate.

protonic
Posts: 22
Joined: Mon Aug 31, 2020 7:52 pm

Re: Chargepoint Questions

Tue Sep 01, 2020 1:05 pm

Thank you for the replies everyone. Very helpful. My i3 is on the charger now and it's only 3.82kw. Maybe I didn't run my battery down enough. I'm at about 3/4 full battery.

I'll check out the app again. I thought you could only select from the drop down list of companies and plan prices. I'll just reinstall the app if I can't manually enter info.


Thanks!

JohnWasser
Posts: 68
Joined: Sat Mar 07, 2020 6:15 pm

Re: Chargepoint Questions

Tue Sep 01, 2020 1:24 pm

protonic wrote:
Tue Sep 01, 2020 1:05 pm
My i3 is on the charger now and it's only 3.82kw. Maybe I didn't run my battery down enough. I'm at about 3/4 full battery.
Unless your battery is very hot it is unlikely your charge rate would be throttled anywhere below an 80% charge.

3.82 kW is about 16A at 240V. Could you have told the car to use the "Reduced" charging rate? The Level 2 charger draws 32A/240V by default but if it is set to "Reduced" instead of "Maximum" it draws 16A/240V.

protonic
Posts: 22
Joined: Mon Aug 31, 2020 7:52 pm

Re: Chargepoint Questions

Tue Sep 01, 2020 2:17 pm

JohnWasser wrote:
Tue Sep 01, 2020 1:24 pm
protonic wrote:
Tue Sep 01, 2020 1:05 pm
My i3 is on the charger now and it's only 3.82kw. Maybe I didn't run my battery down enough. I'm at about 3/4 full battery.
Unless your battery is very hot it is unlikely your charge rate would be throttled anywhere below an 80% charge.

3.82 kW is about 16A at 240V. Could you have told the car to use the "Reduced" charging rate? The Level 2 charger draws 32A/240V by default but if it is set to "Reduced" instead of "Maximum" it draws 16A/240V.

Thank you. Is this done in my car settings or somewhere in the chargepoint app? I looked through the app and didn't see anything other than where you select the breaker amp.

alohart
Posts: 2167
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: Chargepoint Questions

Tue Sep 01, 2020 3:24 pm

protonic wrote:
Tue Sep 01, 2020 2:17 pm
JohnWasser wrote:
Tue Sep 01, 2020 1:24 pm
3.82 kW is about 16A at 240V. Could you have told the car to use the "Reduced" charging rate? The Level 2 charger draws 32A/240V by default but if it is set to "Reduced" instead of "Maximum" it draws 16A/240V.
Thank you. Is this done in my car settings or somewhere in the chargepoint app? I looked through the app and didn't see anything other than where you select the breaker amp.
iDrive includes maximum charging power settings for both AC Level 1 (120 V) and AC Level 2 (208 V - 240 V) but not for DC Levels 1 or 2 (a.k.a., DC fast charging).
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

protonic
Posts: 22
Joined: Mon Aug 31, 2020 7:52 pm

Re: Chargepoint Questions

Tue Sep 01, 2020 3:48 pm

alohart wrote:
Tue Sep 01, 2020 3:24 pm
protonic wrote:
Tue Sep 01, 2020 2:17 pm
JohnWasser wrote:
Tue Sep 01, 2020 1:24 pm
3.82 kW is about 16A at 240V. Could you have told the car to use the "Reduced" charging rate? The Level 2 charger draws 32A/240V by default but if it is set to "Reduced" instead of "Maximum" it draws 16A/240V.
Is this done in my car settings or somewhere in the chargepoint app? I looked through the app and didn't see anything other than where you select the breaker amp.
iDrive includes maximum charging power settings for both AC Level 1 (120 V) and AC Level 2 (208 V - 240 V) but not for DC Levels 1 or 2 (a.k.a., DC fast charging).
I had to google iDrive. Haha. I thought it was an app. Both the 240 and 120 charging was set at reduced! Thanks for the info John and Art! Is there any risk with setting both at MAX or is that the default setting?

I was already excited about the increase in charging speed. Can't wait til my next charge!

jadnashuanh
Posts: 5106
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Chargepoint Questions

Tue Sep 01, 2020 5:10 pm

Some feel that the maximum charging rate will decrease battery life, but with the logic in the car and the liquid cooling, if any, it's not huge.

The limitations are more for if the device is on a shared circuit to prevent you from overloading it. Say you were using the included 120-vac EVSE and plugging it into the garage. That circuit might be the same one that supplies the lights and maybe garage door opener. Things might be fine until you tried to open or close the door...so, BMW gives you a way to lower the maximum draw of the car so you don't pop the breaker. On a dedicated circuit, usually, your best bet is to let the car decide, so choose maximum. It will throttle down if the battery is too hot or even too cold as required to maximize the life. Life's too short to sweat the small stuff.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV
Soon (hopefully!) A 2021 X5 45e will replace the above

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