WetEV
Moderator
Posts: 396
Joined: Sun Jan 03, 2016 1:26 pm
Location: Near Seattle

Re: Hello from ChargePoint!

Fri Aug 17, 2018 3:16 pm

How accurate is the kWh reported by a Chargepoint station?

Is it kWh delivered to the car, or is it adjusted for some charging efficiency estimate? If adjusted, by what percentage?
#49 on the LEAF 100 mile club.
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red
2014 Leaf SL Red
Can't sit in a Bolt seat, hoping for better soon.
Or perhaps a Buick version? Buick Electra 225???

SparkE
Moderator
Posts: 1121
Joined: Sun Sep 11, 2016 5:53 am
Location: SF Bay Area

Re: Hello from ChargePoint!

Fri Aug 17, 2018 9:20 pm

WetEV wrote:How accurate is the kWh reported by a Chargepoint station?

Is it kWh delivered to the car, or is it adjusted for some charging efficiency estimate? If adjusted, by what percentage?


My *guess* would be that it is the electricity delivered to the vehicle, since that is what you are buying ...

How could they guestimate the efficiency since that is determined by the charger in the vehicle?

WetEV
Moderator
Posts: 396
Joined: Sun Jan 03, 2016 1:26 pm
Location: Near Seattle

Re: Hello from ChargePoint!

Sat Aug 18, 2018 1:27 am

SparkE wrote:
WetEV wrote:How accurate is the kWh reported by a Chargepoint station?

Is it kWh delivered to the car, or is it adjusted for some charging efficiency estimate? If adjusted, by what percentage?


My *guess* would be that it is the electricity delivered to the vehicle, since that is what you are buying ...

How could they guestimate the efficiency since that is determined by the charger in the vehicle?


I don't care to guess. So I ask.

Also, I'd guess that the kWh is plus or minus a few percent. But how many percent, I don't care to guess.
#49 on the LEAF 100 mile club.
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red
2014 Leaf SL Red
Can't sit in a Bolt seat, hoping for better soon.
Or perhaps a Buick version? Buick Electra 225???

User avatar
ChargePoint
Posts: 129
Joined: Wed Jul 12, 2017 11:13 pm
Location: Campbell, CA
Contact: Website WLM Facebook Twitter

Re: Hello from ChargePoint!

Tue Aug 21, 2018 8:21 pm

WetEV wrote:How accurate is the kWh reported by a Chargepoint station?

Is it kWh delivered to the car, or is it adjusted for some charging efficiency estimate? If adjusted, by what percentage?


Hi!
All of our products are accurate to less than 1 watt. It's a measure of how much “power” has passed through the station, not necessarily how much your battery “charged up”. For example, on a hot day, your car may have to run the cooling fan to cool the battery, which will show up on the total kWh reported, but not necessarily mean that your battery stored that power. The reported kWh is the total energy that you drew during the session.

WetEV
Moderator
Posts: 396
Joined: Sun Jan 03, 2016 1:26 pm
Location: Near Seattle

Re: Hello from ChargePoint!

Tue Aug 21, 2018 11:41 pm

Thanks.
#49 on the LEAF 100 mile club.
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red
2014 Leaf SL Red
Can't sit in a Bolt seat, hoping for better soon.
Or perhaps a Buick version? Buick Electra 225???

summit
Posts: 33
Joined: Mon Apr 04, 2016 11:13 pm

Re: Hello from ChargePoint!

Wed Aug 22, 2018 4:28 pm

Since the Chargepoint app can see SOC%, why isn't there a setting to terminate charging at certain SOC% ? may be there is, and I just haven't figured it out ?
Thanks

User avatar
ChargePoint
Posts: 129
Joined: Wed Jul 12, 2017 11:13 pm
Location: Campbell, CA
Contact: Website WLM Facebook Twitter

Re: Hello from ChargePoint!

Wed Aug 22, 2018 9:02 pm

summit wrote:Since the Chargepoint app can see SOC%, why isn't there a setting to terminate charging at certain SOC% ? may be there is, and I just haven't figured it out ?
Thanks



If you're using a public ChargePoint station you should receive a notification when you're full (https://www.chargepoint.com/support/driver-faq/#q9). This lets you know it's time to head back, unplug, and move your car to free up that space for others ;) , vs. the ChargePoint Home which lets you stop from the app. However, I've heard from other MyChevyBolt members that they'd like a button to stop charging from the app, too, even at destination chargers (perhaps they have similar needs for stopping by % like yours), so I've shared this feedback with the team previously. I really appreciate your suggestions because it's always helpful for our team to know what features you'd like to see added to the app!

Pigwich
Posts: 240
Joined: Tue Jan 03, 2017 2:01 pm
Location: Southern California

Re: Hello from ChargePoint!

Fri Aug 31, 2018 3:10 pm

Hey Chargepoint!

When are you guys gonna get the Delta AC Mini's certified for your network? I have four of them screwed to a wall, RFID enabled, powered and signed in and on WiFi in Los Angeles and all I need to do is enter the OCPP server addresses and credentials. Can I be your guinea pig?

Greenlots uses them, they couldn't be that horrible, but me and my wife are the only people I know with greenlots FOBs.

Thanks!
(´・(oo)・`)

SparkE
Moderator
Posts: 1121
Joined: Sun Sep 11, 2016 5:53 am
Location: SF Bay Area

Re: Hello from ChargePoint!

Fri Aug 31, 2018 8:05 pm

I'm a GreenLots customer, but don't have a FOB - I always enable via the phone app.

summit
Posts: 33
Joined: Mon Apr 04, 2016 11:13 pm

Re: Hello from ChargePoint!

Fri Aug 31, 2018 8:37 pm

Having a way to terminate charge (with Home Charger) via a SOC % setting would be an awesome enhancement, mainly to prolong battery life. While the Bolt has Hilltop mode, which stops charge at 92% or so; I would rather stop ~50%-75% for most days (particularly when it's over 100F) since I don't need the full 200-mile every day.

Tesla vehicles have a sliding setting to stop charge at certain %SOC for example. The Chargepoint app already has the capability, just need a few line of codes. Plus, it can be used with other vehicle to Hilltop mode.

We live at 2200-ft, and the other two EVs, Volt and iMiEV, can use the Hilltop mode.

Thanks

Return to “Batteries and Charging”