Calculating cost of home charging

[jpiazza67]

See you many KWs the app says after you charge and multiple by 1.1 to get actual cost because an estimated 10% of energy is lost transferring from the house to the car. I pay $25/mo in a pilot program for up to 800 KW/moviff peak. They get the charging data directly from the ford app.

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[hartmms]

I'm personally interested in dollars per mile driven. I have an emporia, so I get the kwh easily into home assistant. I've written some custom sensors to record odometer 8 days ago and subtract that from the current miles. I divide that by the kwh added over those same 8 days. I have a seasonal rate power plan, so I wrote another sensor to return the price per kw of that 8 days.

My whole plan was nixed by the current Fordpass authentication issues. It hasn't been able to fetch data in 2 weeks. No odometer data, not cost per mile.

 

[AliRafiee]

My JuiceBox app tells me how many KwH were added in charge session. I multiply that by the $0.12 that I pay.

 

[shelnian]

I recommend you charge the car to 70 to 80 percent every night. This is what the experts recommend for battery longevity.

 

[MidnightPony]

I have a L2 Home charger and the app tells me how much it cost me after I put in my rates and tiers....usually I go from 30% to 100% (late 2023 LFR Battery) overnight and costs $4

 

[Deleted member 20140]

I have a "Time of Use" plan from Duke. My rate from midnight to 6 am is 7 cents. Cost from 40% to 90% is $3.50. I estimate comparable cost from previous vehicle using high octane is about ten times as much for equivalent range. Of course I do miss standing out in freezing weather handling a cold pump handle.

 

[MrLoganRoss]

The Fordpass app shows kWh used in charge history, and mine is almost consistently 2 - 4 kWh per day.

Given I pay 12¢ per kWh, I can average it out to 3 kWh per day and use:

30 days * 3 kWh * 0.12 = $10.8 / month.

If you want to add up each kWh in your history you can get the exact amount

The problem I have with this method is the FordPass App 5 continues counting KWH while plugged in even if not charging. See circled sessions. Note the times plugged in can be long as I keep it plugged in on short biz trips.

I use the app for my Pulsar Wallbox charger which calculates cost automatically, as shown in the second pic.
Note the difference in “charge time” compared to the ford so even though they are the same sessions.

 

[dabois89]

I've seen people mention in various threads that it costs them $X to charge at home for the mileage they've put on their MME. I'm curious how to determine that.

I bought my MME late December 2023 so I haven't had it six months yet, and I've only ever charged it at home. I immediately had an electrician run a 50amp circuit to my garage and installed the charger that came with the car. I use the car for commuting to my job almost exclusively, plug it in Friday night, charge to 90%, and it's ready for another week. I've looked at my electric bill, comparing my overall KWh pre-charger to the last 5 months or so, but there's so much fluctuation in the overall KWh I use on a monthly basis depending on various factors- which or how many of my kids are in the house for any length of time, outdoor temperature, whether we've had house guests, etc.

How do people determine what it's costing them to charge their EV when charging it exclusively at home?

Sorry if there are other threads on this, I looked but not finding anything on point. Thanks.

I use the ford app and calculate from there, i switched to the Technology rate which is 37 up front on your bill and then .0507 per KWH after that. I could charge my car 5 times a week and use 50 kwh each time and still only pay a quarter of what i was for gas.

 

[IMDIDOC]

I've seen people mention in various threads that it costs them $X to charge at home for the mileage they've put on their MME. I'm curious how to determine that.

I bought my MME late December 2023 so I haven't had it six months yet, and I've only ever charged it at home. I immediately had an electrician run a 50amp circuit to my garage and installed the charger that came with the car. I use the car for commuting to my job almost exclusively, plug it in Friday night, charge to 90%, and it's ready for another week. I've looked at my electric bill, comparing my overall KWh pre-charger to the last 5 months or so, but there's so much fluctuation in the overall KWh I use on a monthly basis depending on various factors- which or how many of my kids are in the house for any length of time, outdoor temperature, whether we've had house guests, etc.

How do people determine what it's costing them to charge their EV when charging it exclusively at home?

Sorry if there are other threads on this, I looked but not finding anything on point. Thanks.

As posted before, the best way is to install a watt meter prior to the charge unit. Thus, you get a more precise reading. The charging unit also draws current even when idle. These are inexpensive devices that use an induction coil around one of the wires.

 

[Rpellicciotti]

you know since the update the kwh delivered in fordpass on previous charging is wacky. Some bug in the way it calculates so for example, on May 25th my car added 118kwh!

Here's a screenshot of my charge history, keeping in mind 60% is about as low a SOC as my car ever gets.

This is a bug in the software. It doesn't look at the amount of charge you put in at all. It takes the total amount of time your car was plugged in (charging or not) and multiplies it times the speed of your charger (approximately 10kw/h). So this is useless for what the OP wants to do and really should have never seen the light of day.

It wont be exact but you can take the total capacity of your battery pack (mine is 91kWh) and multiply it by the amount of charge you put in (for example charging 10 to 80% or 70% charge). IN this case the answer is 63.7. My electricity costs $0.12 per Kwh. So .12 times 63.7 is $7.65.

This is not exact as there are some losses to heat and also running other things on the car such as coolant pumps while charging. Its close enough though to know what you are spending.

 

[curtisfinney]

My garage is setup for time of day (separate service). I charge off peak and with fees, it’s roughly $50-$60 a month for roughly 800-1000 miles.



My ChargePoint also tracks, but it doesn’t account for fees.

 

[Sawdusty]

All good info, thanks everybody.

 

[hbirring01]

My Autel home charger does it for me. I looked on my bill and got the price per kwh and just entered it into my charger settings. Also you could just look on your bill and see what your price/kwh is and multiply that by how many kwh you use to charge your car

 

[Norcolboulder]

i only have a ford mobile charger that offers no metrics. But I can estimate the kWh I used to reach 100% and use my EV charging rate of .07 per Kwh .Just a rough estimate but suitable for myusage at this time. With solar panels and EV charging rates it is very inexpensive.
I thank all forum members for the precise information and the obvious benefits of the third party level 2 chargers. When my free mobile charger fails I can choose a suitable replacement

 

[Schwartzcynthia]

I am charging ONLY on solar. I have an Emporia EV charger that is set to charge only on excess solar during the day. That is how I mainly charge, however if and when I need to charge at nighttime or rainy conditions, my 4 Powerwalls take over (they run the house anytime there is no solar) and since they are only charged from solar, my car only gets charged from solar. While I am connected to my utility company (PG&E), I rarely use energy from them. My yearly true-up was just a couple of months ago in April and I had a $1600 credit.

I am having solar, battery packs and generators being installed as we speak. Can't wait to be off the grid

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