Recording kWh's used

[Homestead]

I would like to record my total kWh's used each month for the car, not sure the best place/method to do this.
Expect all my charging to be at home using my L2 40 amp charger.
Seeing some inaccuracies in the app and charging logs so wondering the best place to collect data..
What about power consumed when car is not charging?
Anyone else have a good method for logging this?

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[Howard]

Hello, I created a spreadsheet in Excel. The calculations use a lot of assumptions so no need for anyone to get upset about them. I log the starting HVB SOC % and the target SOC % that I am charging to in the first two columns. The next two columns have a formula to convert the %s to kwhs; the next column shows the total amount of kwhs added. The next two columns are start date and finish date (you might not be interested in that info). The next column I use to designate which MME this charging data is for (22 Select SR (1) and 23 Premium ER (2)). I don't worry about trying to account for temperature changes and other variables since I am just trying to get a rough idea of how many kwhs I'm charging not an exact value. I have compared my calculated kwhs added in spreadsheet to kwhs added as shown in FP app and I've actually logged initial and final kwhs to empty via Car Scanner app to each other. While I was comparing these three sources, I found that the variance between the them were less than 0.5%. Good enough for me lol. I've also compared my electric bills from the same month the year before I bought my first MME to same month this year with charging; The difference between my non-charging bill kwhs used and my charging bill kwhs used is extremely close to the amount of kwhs I've calculated adding via spreadsheet. Again, I'm not using these numbers for anything official. Just for some general conversations. I don't track kwhs used for preconditioning battery and cabin; Where I'm at here in West TN, our winters aren't too bad for the most part. Most of my preconditioning sessions take about 25-40 minutes depending on ambient temperature. The data that I tracked initially last winter showed that HVB preconditioning would pull close to the full 6 kw load and would last for about 15-20 minutes; and then the heater load drops to about 3 kw for cabin conditioning for the remainder of the time. Obviously, the lengths of these times will depend greatly on ambient temperature and starting temperature of HVB battery. Just one way of doing this where you can get your starting data from FP app and HVB SOC % is usually the same as it is in the car.

 

[OWG]

I would like to record my total kWh's used each month for the car, not sure the best place/method to do this.
Expect all my charging to be at home using my L2 40 amp charger.
Seeing some inaccuracies in the app and charging logs so wondering the best place to collect data..
What about power consumed when car is not charging?
Anyone else have a good method for logging this?

How OCD are you?
I too run a spreadsheet where I aggregate data from the EVSE (Wallbox Pulsar Plus) (kWh into the car), a energy monitor in the panel that supports the EVSE (kWh into the EVSE), the mileage between charges, ect.
If you just want kWh into the car, reporting off the EVSE is the way to go.
The Energy Monitor (i use Emporia) is a fairly simple way to track what you are looking for if your L2 Charger does not provide that info.

 

[Teslaeata]

I would like to record my total kWh's used each month for the car, not sure the best place/method to do this.
Expect all my charging to be at home using my L2 40 amp charger.
Seeing some inaccuracies in the app and charging logs so wondering the best place to collect data..
What about power consumed when car is not charging?
Anyone else have a good method for logging this?

ABB charge point automatically e-mails me my monthly usage report, surely this is the base level for every manufacturers’ charge points?

For somebody who does the blokey thing of failing to RTFM, dare I suggest…………no I daren’t, ill get trolled?

 

[Teslaeata]

How OCD are you?
I too run a spreadsheet where I aggregate data from the EVSE (Wallbox Pulsar Plus) (kWh into the car), a energy monitor in the panel that supports the EVSE (kWh into the EVSE), the mileage between charges, ect.
If you just want kWh into the car, reporting off the EVSE is the way to go.
The Energy Monitor (i use Emporia) is a fairly simple way to track what you are looking for if your L2 Charger does not provide that info.

Sounds good?

I spreadsheet all energy I buy at home or at public charge points, and attached costs, with business & private mileages so I can calculate pro-rata how much power is used for business so I can pay myself back the business element avoiding any tax liability.

That way I know precisely how Stangy’s performing.

 

[Homestead]

How OCD are you?
I too run a spreadsheet where I aggregate data from the EVSE (Wallbox Pulsar Plus) (kWh into the car), a energy monitor in the panel that supports the EVSE (kWh into the EVSE), the mileage between charges, ect.
If you just want kWh into the car, reporting off the EVSE is the way to go.
The Energy Monitor (i use Emporia) is a fairly simple way to track what you are looking for if your L2 Charger does not provide that info.

Wasn't thinking about this when I bought my charger (grizzl-e). So no help there.
I guess what would be best is the energy monitor in the panel how are you doing this?

The other thing Charge log shows 8K when charging but 240 * 40 amps = 9.6kw.
Where is the error in 8k? I expect some losses but not that much.

 

[VaporTrails]

Wasn't thinking about this when I bought my charger (grizzl-e). So no help there.
I guess what would be best is the energy monitor in the panel how are you doing this?

The other thing Charge log shows 8K when charging but 240 * 40 amps = 9.6kw.
Where is the error in 8k? I expect some losses but not that much.

Emporia would be happy to sell you just the monitor. The current detector would be installed on the hot wires to your existing Grizzl-E. It has a ton of automation that might shed some light on some other loads as well. The main benefit to the Emporia EVSE is Solar charging automation. If you have Solar, it can charge your car based on that production.

 

[OWG]

Wasn't thinking about this when I bought my charger (grizzl-e). So no help there.
I guess what would be best is the energy monitor in the panel how are you doing this?

The other thing Charge log shows 8K when charging but 240 * 40 amps = 9.6kw.
Where is the error in 8k? I expect some losses but not that much.

I see a ~13% loss between what goes into the EVSE and what the EVSE dispenses to the car. I don't trust the FordPass data enough to use it.

 

[Homestead]

Emporia would be happy to sell you just the monitor. The current detector would be installed on the hot wires to your existing Grizzl-E. It has a ton of automation that might shed some light on some other loads as well. The main benefit to the Emporia EVSE is Solar charging automation. If you have Solar, it can charge your car based on that production.

Emporia looks like a possible solution. That would record the power consumed when plugged in but not charging too.

 

[Homestead]

I see a ~13% loss between what goes into the EVSE and what the EVSE dispenses to the car. I don't trust the FordPass data enough to use it.

How did you measure the 13%?

 

[Howard]

When I monitor my L2 charge via car scanner app, I see a charge rate of 8.8 to 9.1 kw/hr. I have a 40 amp Grizzl-E Duo charger. It is rare that I have to charge them both at the same time but it is nice to be able to if the need arose. Of course total power would be split between the two MMEs.

 

[OWG]

How did you measure the 13%?

Calculated from the kWh to the EVSE and the kWh from the EVSE - not directly measured.

 

[dtbaker61]

I would like to record my total kWh's used each month for the car, not sure the best place/method to do this.
Expect all my charging to be at home using my L2 40 amp charger.
Seeing some inaccuracies in the app and charging logs so wondering the best place to collect data..
What about power consumed when car is not charging?
Anyone else have a good method for logging this?

the emporia Vue monitor is only $125 or so. comes with CTs for main conductors and 8 branch circuits. The reporting is a little wonky, but if you are a spreadsheet king you can export raw data to .xls

https://www.amazon.com/Emporia-Moni...etering/dp/B08G37ML2R/ref=asc_df_B08G37ML2R/?

 

[Homestead]

Measured the current on the charger input mains today while charging.
It was 200ma idling before charging started.
Current slowly ramped up to 39.4 amps over 15 seconds.
I don't think my current probe will be able to loop over the output wires of the grizzl-e.
Not enough room to clamp on.
But I don't think there are big losses in unit as it doesn't even get warm.

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