How to set to profile to only charge to 85%

[W1NGE]

What if you don't have a regular daily departure time and you simply want the car to charge when the preferred charging window starts and end at 85% SoC, while charging at whatever rate the EVSE provides (in case of a balancing EVSE, that rate will vary depending on how many EV's are charging at the same time)?

I don't have any experience with a balancing EVSE - PMCC doesn't have this feature.

What we do have depending on energy provider is a Charge Anytime app which integrates with the car's PCM to continually manage its own timer and profile based on when energy is cheaper. You set your minimum charge, target charge and ready by and let the app determine when to start / stop charging based on load and cheaper rates. Works really well and reduces costs significantly - 0.10p / kWh compared to 0.36p or more.

I've now stopped using my own profile and timer and simply let the app do its thing.

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[whitex]

I don't have any experience with a balancing EVSE - PMCC doesn't have this feature.

What we do have depending on energy provider is a Charge Anytime app which integrates with the car's PCM to continually manage its own timer and profile based on when energy is cheaper. You set your minimum charge, target charge and ready by and let the app determine when to start / stop charging based on load and cheaper rates. Works really well and reduces costs significantly - 0.10p / kWh compared to 0.36p or more.

I've now stopped using my own profile and timer and simply let the app do its thing.

Interesting, a third party app filling a need Porsche couldn't. I suppose you have to give this app your credentials to login to Porsche account, so it can manage your timers? Or is there a way you can grant it just access times via security token (though somehow I doubt it, Porsche hasn't even discovered two factor authentication yet).

 

[AndiL]

If the EVSE limits the maximum charging power or doesn’t allow charging, the Taycan will do that.

Having a profile with minSoC set to 85% will cause the Taycan to always have a charging demand until the SOC reached 85% like any other EV does with an SoC limit set.

But if the EVSE limits charging speed or denies charging, the Taycan will also follow that order.

 

[whitex]

This is not possible, that’s the whole point, smart charging and a hard cap @ 85% cannot be combined. The slider initiates direct charging when below.

I guess the only solutions are:

1. A third party app like @W1NGE uses, though my concerns there is security and possible battery drain if the app keeps connecting to the car often.
2. A programmable EVSE which would enable charging during the proper time windows, then keep the Taycan on Optimized charging with minimum in the profile set to your desired maximum.

 

[AndiL]

This is not possible, that’s the whole point, smart charging and a hard cap @ 85% cannot be combined. The slider initiates direct charging when below.

This is possible as I explained in my previous post

 

[whitex]

But if the EVSE limits charging speed or denies charging, the Taycan will also follow that order.

I believe this is only true for optimized charging. If the EVSE limits the charging speed when the timer kicks in (as compared to when you originally plugged in), the timer errors out and never engages (probably because the timer start time was calculated based on a higher charging speed, but since it is no longer available, it doesn't charge at all - I guess the guiding principle here is "either do it right or don't do it at all"). At least that is what I have been reading, never tried it myself as I just decided to not use timers on the car at all, let the EVSE manage the car.

 

[AndiL]

I believe this is only true for optimized charging. If the EVSE limits the charging speed when the timer kicks in (as compared to when you originally plugged in), the timer errors out and never engages (probably because the timer start time was calculated based on a higher charging speed, but since it is no longer available, it doesn't charge at all - I guess the guiding principle here is "either do it right or don't do it at all"). At least that is what I have been reading, never tried it myself as I just decided to not use timers on the car at all, let the EVSE manage the car.

No, this is always the case! The Taycan can NOT charge if the EVSE sets an overload protection limit.

The optimized vs. preferred charge time settings do not having anything to do with this. They only have an effect on timer settings on when the Taycan will have an additional charging demand above the min SoC.

Note: I am writing software that controls HEMS systems AND wallboxes. I do have deep knowledge about all the tech involved and all the standards and protocols involved.

The EVSE managing the complete charging has a lot of challenges and problems. So I disagree with that statement.

 

[W1NGE]

Interesting, a third party app filling a need Porsche couldn't. I suppose you have to give this app your credentials to login to Porsche account, so it can manage your timers? Or is there a way you can grant it just access times via security token (though somehow I doubt it, Porsche hasn't even discovered two factor authentication yet).

Yes, you login to the app and link your Porsche ID to the energy provider (OVO) which then stores your credentials. @Speuk recommended it and it has been the top piece of advice on this forum all year.

It then creates its own profile which is visible to you and disables the others. It is tied into your home address where the energy provider provides your power.

App integrates with other car manufacturers too - pre-requisite is that your car needs to be ‘connected.

Note that Porsche didn’t code My Porsche App…part of the software disaster surrounding the group and ultimately cost the CEO of VW his job.

 

[Scandinavian]

I don't have any experience with a balancing EVSE - PMCC doesn't have this feature.

What we do have depending on energy provider is a Charge Anytime app which integrates with the car's PCM to continually manage its own timer and profile based on when energy is cheaper. You set your minimum charge, target charge and ready by and let the app determine when to start / stop charging based on load and cheaper rates. Works really well and reduces costs significantly - 0.10p / kWh compared to 0.36p or more.

I've now stopped using my own profile and timer and simply let the app do its thing.

Sounds a bit like what you can do with Tibber?? But this needs a compatible EVSE? Or does it work with PMC+ or PMCC. Or generic EVSE?

 

[W1NGE]

Sounds a bit like what you can do with Tibber?? But this needs a compatible EVSE? Or does it work with PMC+ or PMCC. Or generic EVSE?

EVSE independent as far as I am aware. I guess the trick here is that it is programming the PCM and not the EVSE.

Works on PMCC for sure and no reason to doubt it won’t on PMC+ and other brands - possibly the ‘dumber’ the better.

 

[AndiL]

I don't have any experience with a balancing EVSE - PMCC doesn't have this feature.

The PMCC does have this feature as any EVSE has. For the PMCC it is controlled by a compatible HEMS.

 

[Raphie]

This is possible as I explained in my previous post

Yes but the cap needs to be enforced by the evse, if that doesn’t provide then no joy.
better rephrase: It’s not provided for in the MyPorsche App / Portal

 

[AndiL]

Yes but the cap needs to be enforced by the evse, if that doesn’t provide then no joy.
better rephrase: It’s not provided for in the MyPorsche App / Portal

No. The PMCC is the only EVSE that would have a chance to know the SoC of the Taycan. Any other EVSE on the market right now does not know the SoC of any EV!

So the best way for any EV to stop charging over a specific SoC is to make the EV not having more demand.

If your system has online API access to your Porsche account, and the Taycan has a cellular connection (doesn't work everywhere), then this system could regularly check the current SoC and either try to stop the demand via the online API or by having access to the EVSE and demand it to stop providing energy.

Another way is to use a compatible HEMS with the PMCC that does this without any online connection required.

Update: But in general it is best to have the charging limits set in the EV itself. Because then the EV best handles going to sleep and waking up again properly. And heating/cooling the cabin for departures can also be done easily.

 

[Scandinavian]

EVSE independent as far as I am aware. I guess the trick here is that it is programming the PCM and not the EVSE.

Works on PMCC for sure and no reason to doubt it won’t on PMC+ and other brands - possibly the ‘dumber’ the better.

Thanks, that sounds interesting. We do not have so sophisticated supply here in France but it might well come in future.

My only concern then would be that you need a reliable connection to the internet? If the app/system will speak to the PCM frequently? Even more requirement for WiFi connection from Taycan. I have no cell connection in my garage.

Secondly how will the 12 volt battery be impacted by frequent wake up calls to PCM. Especially fora longer period of no use of the car. Normal day to day use would be fantastic though. Plug and forget!

 

[whitex]

Yes, you login to the app and link your Porsche ID to the energy provider (OVO) which then stores your credentials.

Storing credentials is what would worry me. It's an archaic way to integrate things like this, and by today's security standards, very insecure. I don't know who OVO is, but I would not trust any company to store my credentials to other accounts, unless they had no way to access them (such as "password keeper" type apps).

The proper way to do it is Porsche should be able to generate a security token, essentially like a special account key for OVO which you grant access only to manage timers and profiles (but not to for example unlock the car), and you can revoke that token at any time without having to change passwords on your end.

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