Taycan Charging Calculator [save/load/delete app state]

[Jhenson29]

Taycan Charging Calculator

Updates 4/24/22

• Added
  • Save/Load/Delete buttons to app-config
  • Allows app state to be saved to local storage
  • App checks for saved data and asks to load when started
• Changed
  • Minor updates to DC charging model
• Fixed
  • Fixed error where pricing used EV kWh instead of EVSE kWh for AC charging when not using preferred pricing.

Updates 4/20/22

• Changed
  • App config button will close app config if open (acts as a toggle now)
• Fixed
  • Fixed bug that crashed program if there were no charge results

Updates 4/17/22

• Added
  • Pricing inputs and calculation for DC and AC charging (@JimBob)
    • Pricing is off be default. Enable pricing calculations in the app config (gear icon at top right)
    • DC pricing has entries for "per kWh" and "per minute".
    • AC pricing ahs an entry for "per kWh" and an optional entry for preferred times pricing.
    • Enter the currency symbol in the app config.
  • Menus can be now be set to "toggle" open instead of the default of "open one at a time". See app config.
• Changed
  • Consumption calculations are now optional. They are on be default, but can be turned off in the app config.
• Fixed
  • Fixed profile preferred time calculation to move preferred time charging to end of preferred time during timer charging.

Updates 4/16/22:

• New App Config to select metric units. (access with 'gear' icon at top right).
• New setting for kWh/100mi (or km based on units)
• Added "miles" to results tables (or km based on units)
• Added 'total time' display to results table (just below summary).
• New setting to adjust the charging efficiency for AC charging from the default of 94%.
• Added DC charging calculation
  • New setting to select AC or DC
  • New settings for max station power (DC)
  • New setting for target charge percent (DC)
  • New setting for 200kW limited optimized charging (DC)
• Model comparison improvements
  • Compare up to 4 models
  • First model can now be deleted if there is more than one model.
  • Models retain original color when other models are deleted
  • Better feedback on model selection using model colors on tab buttons

Initial Release 4/15/22:

Adjust battery size, EVSE power, profile, timer, and starting settings to calculate the charging profile.

View the profile in the graph.

View charging section results in the results table.

View preferred charging times in the graph.

Get help calculating your EVSE power.

Compare up to 3 different charging profiles.

Make charging profile art. ?‍

To Do:

• Cache for for offline use
• Implement more than one timer
• Implement plug-in day and selection of timer repeat days
• Implement complex AC charging model
• Range calculator

Known Issues:

• On mobile, sometimes a slider will return to the previous value on release

Bug Reporting:

• Send me a message or post a comment. I didn't spend much time on this, so I'm sure it's not perfect. Sorry in advance.

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[Deleted member 6348]

I went from 12% to 85% on my 9.6kw Level 2 charger last night in six hours flat on my PB 4S.
How do you set the target charging point to something other than 100?

Once you've charged a number of times, level 2 math is pretty straightforward because the kw are more less the same start to finish. Level 3 charging is the tricky one, because the charging curve changes with the SoC.

 

[JimBob]

@Jhenson29

Lot's of work in this.

I thought your Power Calculator was pretty slick.

I was thinking that what would make this really useful, would be the ability to add your cost of electricity, off peak and peak to see what it costs to run this car. I think you have all the details in your model to do this. And maybe just a simple calculation to compare it with charging costs if charging using EA or other for the same amount of power.

Plus there is some other fun stuff that could be added.

 

[Jhenson29]

How do you set the target charging point to something other than 100?

In the app or on the car? Same in either case I guess. Set a profile for min 85% on optimized for immediate charging or a timer with a target charge for a different time in the future. In either case make sure the profile/timer is active.

Edit:
My SoC settings are in 5% increments (to keep it simple). Calculator says just under 6hrs for 10-85%. So, pretty close. I’m using 94% efficiency. That and other factors can make it vary some.

 

[Jhenson29]

I was thinking that what would make this really useful, would be the ability to add your cost of electricity, off peak and peak to see what it costs to run this car. I think you have all the details in your model to do this.

Yeah, maybe. It’s easy enough to set rates and time spans and multiply charge times by rates. I’ll look into it tomorrow morning.

And maybe just a simple calculation to compare it with charging costs if charging using EA or other for the same amount of power.

Like, build in models for public charging network costs? I’m not sure I want to bother keeping it up to date. Plus different models for charging by time/energy/power. Seems out of scope. I just wanted to make pretty pictures.

 

[JimBob]

No models for network costs. Just let the user stick in a single number for whatever network they use and compare. I think EA/EC runs about 3x the cost of home charging. But don't know for a fact.

The fun stuff. How many pounds of CO2 do I not dump into the air driving a Taycan. You will need your regions mix as to the source of electricity, fossil/renewable/nuclear but that is readily available.

You have economists being paid to write reports on all this stuff, and you have a calculator that looks like with a few tweaks could do it. Think big!

 

[Jhenson29]

Just let the user stick in a single number for whatever network they use and compare.

Single number for what though? Costs per kWh? The issue is I think some (or many?) have a much more complex model. I’m pretty sure I’ve read on here that some have costs based on time, energy, and max available power (ionity maybe?).

Public charging, CO2…could add miles driven, yearly costs…the list goes on… but that’s called feature creep and that’s how things don’t get done.?

 

[JimBob]

Feature creep is what makes things useful otherwise I would dump my iPhone.

Costs per kWh or whatever the charging station shows. Don't over think. You aren't in the business, but someone who uses a station on a more than casual basis, will have a good idea of the number.
I think the point I am making is that companies sell equipment to give you your energy usage and cost and you can do it in a simulator to a pretty good level of accuracy that anyone can do on their iPhone.

 

[OTPSkipper]

Very cool @Jhenson29 !

 

[tigerbalm]

Very nicely done @Jhenson29 – I can see this as being very helpful on my road-trips for estimating destination charging at hotels.

Do you have the source code up on a Github repo anywhere?

 

[Jhenson29]

Do you have the source code up on a Github repo anywhere?

Not yet. I’m not very active in GH as I don’t do much open source work, but I do have an account and will publish after I’ve….um….cleaned it up a bit. Still working on adding features and changing structure a lot right now.

 

[MohCT4]

@Jhenson29 This is a really impressive tool! I’m thinking about taking a road trip and the house we’re renting just has standard 110v outlets. I plugged that in to the power calculator and I’m confused. First one is my current home setup: 240v on a 50amp breaker so I’m getting the full 40amp:

Second one is with a 110v 24 amp plugged in to the power calculator.

Am I missing something? I feel dumb. This makes it seem like the 2.6kw charging will take less time. ??‍ Very confused.

 

[Jhenson29]

@MohCT4 The 2.6kW hour has a +1, which means an extra day. Sorry, I don't think I ever explained that very well (or at all?). It's possible to generate charge times that are extremely long, so I display all of the times (absolute or spans) with additional days shown as a plus number at the end.

So, the 9.6kW takes 8 hours and 49 minutes, while the 2.6kW takes 8 hours and 3 minutes...plus a day (24 hours), so around 32 hours total.

Maybe that's not the best way and for time spans, I should just show the hours. I'm open to suggestions. Thanks.

 

[Jhenson29]

New updates pushed this morning for the following features (hope I didn't break anything...):

• New App Config to select metric units. (access with 'gear' icon at top right).
• New setting for kWh/100mi (or km based on units)
• Added "miles" to results tables (or km based on units)
• Added 'total time' display to results table (just below summary).
• New setting to adjust the charging efficiency for AC charging from the default of 94%.
• Added DC charging calculation
  • New setting to select AC or DC
  • New settings for max station power (DC)
  • New setting for target charge percent (DC)
  • New setting for 200kW limited optimized charging (DC)
• Model comparison improvements
  • Compare up to 4 models
  • First model can now be deleted if there is more than one model.
  • Models retain original color when other models are deleted
  • Better feedback on model selection using model colors on tab buttons

The DC Charging calculation is based (roughly) on the below model:

https://insideevs.com/news/512344/porsche-taycan-fast-charging-analysis/

I think I've read elsewhere in the forum that this model is not completely accurate and some people see higher power deeper into their SoC. I wouldn't know since I never DC charge. However, I tend to think the actual time difference is quite minimal. I'm also using a somewhat simplified model right now that uses constant power within the steps instead of it changing based on battery voltage. it should still be relatively close. I'll consider it more and listen to suggestions for additional changes. It does calculate 23 min for 5%-85% (I don't do seconds).

@JimBob I didn't get to any cost related updates as I only had a couple of hours this morning and worked on the above updates instead.

 

[JimBob]

With respect to your DC charging calculation. Do you differentiate between 400v and 800v chargers? My guess is its all 800v assumed otherwise you would have to select the on board charger option.

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