Charging efficiency (home charging)

[Schox]

Do anyone know if the FordPass reported charging statistic is somewhat accurate for energy added to the HVB?

Latest session, without preparing for drive.
This give a approximate loss of 2.2kwh for the session - witch makes the loss in the range of 7-8% (7,59% if you believe that the decimals make sense ?)

It's not that important, but I'd like to know approximately how efficient the Mach e is ...
It will probably vary from SOC, battery and ambient temperature, etc. but still ?

This is ”Normal charging", that in ?? is known as L2 charging (230V/32A single phase) BTW

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[BalsaDust]

yes you will always see a difference due to the loss in the EVSE (your home "charger"). Not sure how others calculate the loss but I use 10% and claculate this by multiplying the actual number the car reports by 1.1 and that is approximately how much energy was used to charge the battery.

Tony

 

[hybrid2bev]

My last session was about 95% efficient. Which was normal.

 

[GatorGrowl]

I get in the 5-7% loss range. Rule of thumb is 10%, so I feel like it’s not bad.

 

[ATL]

These numbers line up with my experience reading the difference between the charge reported by the vehicle and the energy delivered by the EVSE. In round numbers, say 10% charging losses but finer calculations point to something slightly above 90% efficiency for the accuracy sticklers among us.

 

[Mach-Lee]

26.8 kWh / 29.0 kWh = 92.4% efficient charging. Normal.

 

[Schox]

26.8 kWh / 29.0 kWh = 92.4% efficient charging. Normal.

Yea, I "know" - and I know how accurate the evse is in reporting energy consumption, including evse loss - what I don't know is how accurate the MME/FordPass is at calculating the «energy added to HVB» is - as there's a lot of sources of inaccurate calculations.
If It's a "delivered to HVB", it is a significant difference in "added to HVB" - but as Ford don't tell officially - one have to guess (more or less educated), or make a lot of measurements and check with ODB2 scanners, and even then, you have to rely on the MME's calculations/algorithms.

But that said, I just have to repeat that this is not important, I'm just a nerd ? for those type of stuff.

 

[RickMachE]

Yea, I "know" - and I know how accurate the evse is in reporting energy consumption, including evse loss - what I don't know is how accurate the MME/FordPass is at calculating the «energy added to HVB» is - as there's a lot of sources of inaccurate calculations.
If It's a "delivered to HVB", it is a significant difference in "added to HVB" - but as Ford don't tell officially - one have to guess (more or less educated), or make a lot of measurements and check with ODB2 scanners, and even then, you have to rely on the MME's calculations/algorithms.

But that said, I just have to repeat that this is not important, I'm just a nerd ? for those type of stuff.

So your EVSE reports the amount delivered to the vehicle's battery? In the US, only DC fast chargers tell us the net (and bill us on it), the AC chargers tell us what they sent to the car, which includes the loss, so we have to calculate what the car got if we care.

 

[VaporTrails]

My Emporia tells me what was sent to the car, but not what the inverter put in the battery. The best charging efficiency is going to be DCFC, but it is not lossless. I only concern myself with what my right foot extracts from the car. If the number moves lower than 2.5mi/kw (GTPE) then I would consider if there is an efficiency issue. I’m not clear on what your measurement goal is. The EVSE is just a switch. It controls current but does not change the voltage. Should not be any substantial loss in the EVSE.

 

[Schox]

So your EVSE reports the amount delivered to the vehicle's battery?

No, the evse is reporting delivered to the "cable connector" (cable loss not included) - my meter report delivered to the circuit with the evse's. The loss is typically <.5% (greater when ambient temperature is high) including cable loss from the meter to the esev's.

If I calculate loss including the standby loss when I'm not changing, that's another topic, witch I have yet to investigate ?

 

[AKgrampy]

I think your question is whether the data in FP is accurate. I know some data is not so accurate but it appears charging may be. My last charge recorded as 22.7 kW on FP and 24.1kW on ChargePoint for a 94% efficiency.

 

[Mach-Lee]

Yea, I "know" - and I know how accurate the evse is in reporting energy consumption, including evse loss - what I don't know is how accurate the MME/FordPass is at calculating the «energy added to HVB» is - as there's a lot of sources of inaccurate calculations.
If It's a "delivered to HVB", it is a significant difference in "added to HVB" - but as Ford don't tell officially - one have to guess (more or less educated), or make a lot of measurements and check with ODB2 scanners, and even then, you have to rely on the MME's calculations/algorithms.

But that said, I just have to repeat that this is not important, I'm just a nerd ? for those type of stuff.

It measures how much goes into the pack. So if there’s heating involved the % efficiency will go down.

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