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Model S - HPWC (High Power Wall Connector)

CSFTN

Member
Aug 24, 2014
918
506
Memphis, TN
Not currently - but it has been stated that the Gen3 (for sale now) have the physical hardware to do so, and the plan is to add this feature to the software, in the future .... no one knows when
 
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FlatSix911

Porsche 918 Hybrid
Jun 15, 2015
6,502
5,910
Silicon Valley
Do these wall chargers have a way of keeping track of the usage? I will be installing and my company will pay for the charging. Without adding anything else to the system, does the charger keep a tab of the kwh used?

Try using an aftermarket app to track your usage and other features... Tesla Stats is one of the best.
Tesla App | Stats for Tesla (maadotaa.com)
Stats: For Model S/X/3/Y on the App Store (apple.com)

Stats for Tesla iOS App [REVIEW] - Drive Tesla Canada

upload_2021-1-29_19-21-32.png
 

HankLloydRight

No Roads
Jan 18, 2014
12,858
10,859
Connecticut
Do these apps show actual grid consumption or just KWh used from the battery? Do they estimate the losses between the wall and the battery? I’d think the OP wants actual mains consumption.
 

brkaus

Well-Known Member
Jul 8, 2014
7,690
6,219
Austin, TX
Yes, it is for reimbursement. How much electricity did I use to charge my car so the company can pay.
There are lots of old style analog meters for sale online and eBay. Sometimes listed as "RV Park Electric Meters". That would probably be the most reliable. Utilities have switched to digital communicating meters so plenty of old style available.

teslafi does show power from the wall at a certain location, but I don't know how accurate it would be.

I have attached a CSV (renamed to txt) of all my charges at a nearby WholeFoods as an example. PM me if you want a code to extend the free trial.
 

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tga

Supporting Member
Apr 8, 2014
3,872
2,675
New Hampshire
There are lots of old style analog meters for sale online and eBay. Sometimes listed as "RV Park Electric Meters". That would probably be the most reliable. Utilities have switched to digital communicating meters so plenty of old style available.
I found this site a while ago. No direct experience, although I was planning to buy a meter and pan from them to monitor charging - Hialeah Meter
 

davewill

Active Member
Feb 5, 2014
1,819
1,964
San Diego, CA, US
I found this site a while ago. No direct experience, although I was planning to buy a meter and pan from them to monitor charging - Hialeah Meter
I have one of these. They make much smaller meter boxes than that are hardly larger than the meter. This install was for a program my utility ran. I slapped the meter from Hialeah in there later, after the program ended. You can mount it next to your wall connector and wire through it. You can also get small electronic ones on eBay.

IMG_20180613_143630.jpg
 
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Fiver

Active Member
Apr 10, 2015
1,853
1,544
Utah
Do these apps show actual grid consumption or just KWh used from the battery? Do they estimate the losses between the wall and the battery? I’d think the OP wants actual mains consumption.
Yes they do calculate losses, and if you find them to be inaccurate you can manually change the power factor to correct them. I've found them to be very accurate even when using shore power to preheat the car and battery while charging (which drives charge efficiency way down).

TeslaFi example:

Screen Shot 2021-01-30 at 6.14.17 PM.png
 
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HankLloydRight

No Roads
Jan 18, 2014
12,858
10,859
Connecticut
I've found them to be very accurate even when using shore power to preheat the car and battery while charging (which drives charge efficiency way down).

Right, but to confirm accuracy, you still need a reading of actual power consumed from the wall/grid. Otherwise, it's still just an estimate that could go high or low depending on the efficiency factor.
 

Fiver

Active Member
Apr 10, 2015
1,853
1,544
Utah
Right, but to confirm accuracy, you still need a reading of actual power consumed from the wall/grid. Otherwise, it's still just an estimate that could go high or low depending on the efficiency factor.

I don't have any full scientific tools, but I started with a wifi 40amp Juicebox that had similar online features to TeslaFi and it reported similar numbers, so there's that. I should add in my above screenshot I had cabin heat and battery heat going for 40 minutes of the 8 hour charge, which really drove down the efficiency.
 

davewill

Active Member
Feb 5, 2014
1,819
1,964
San Diego, CA, US
How does that monitor 240v with only one CT?
You only need two if you're measuring a 4 wire circuit with two hots and a neutral, (like inside a panel) where the two legs are not always part of the same circuit. With the EVSE, even if this is a 14-50, all of the current will go through both legs, so we only need to measure one side.

Looked at mathematically, if you were measuring energy consumed for your whole house you'd measure amperage of both legs and the total watts at any given time would be:

L1*120v + L2*120v

With a 240v load, L1 will always equal L2, so the equation simplifies to:

L*240v

It's a little more complicated, since we don't use an assumed voltage, but instead measure the voltage between each leg and neutral in the first case. However, that works fine, too if we measure voltage in the second case across both legs.
 
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