How to set to profile to only charge to 85%

[Scandinavian]

That said, all the same, since the desired SoC by the charge planned can be really off (my worst case was over 25% off - car thought I'd arrive at 35% SoC, I arrived well under 10%, and that was feather throttling and slowing down the last 10 miles). To be fair, about 1500 miles into the 3,500 mile road-trip, the estimate got much better.

I guess this was on your long drive when you collected the car?
We’re all services in the Taycan activated, ie LTE and connect etc At the time when this happened?
I am surprised to read that you had such a large deviation at that time. Was the weather changing very rapidly and unexpected for you? Normally the car will take into account the expected weather through the weather app, once a route has been planned with charging stops.
Have you tried this out since that time even if only driving perhaps some 50 to 70 miles without the need to stop for a charge?

My experience in 40 k km has been the opposite. In all weathers, except an unexpected violent thunderstorm with heavy rain and hailstones, the planned SoC at destinations, have been within a few percentage points. 1 to 3 % difference normally. Largest observed deviation was about 5%, reason was I drove at much higher speed than I guess is in the plannner, on the German Autobahn.
Apart from this it has been very reliable in my case and I trust my car fully for long trips.

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[Raphie]

Same here, it adjusts dynamically and when under 15% it starts to put limiters on <100 <90 etc.

 

[Scandinavian]

Exactly, timers then only limit and defeat the HEM purpose

The timers are needed to set a preferred time to have the car ready for departure, whether you have a HEM or not. In my case the HEM protects the home fuse to not trip during charging if the other charger and the pool heaters or aircon units should draw too much power.

I do not have solar panels yet so that might unlock some more features from the HEM though.

 

[Scandinavian]

Same here, it adjusts dynamically and when under 15% it starts to put limiters on <100 <90 etc.

Yes those limiters are a feature of the Porsche Intelligent Range Manager, which I do not use at all. I tried it for a while in the beginning, but it planned in so crazy charging stops and limited the speeds completely unnecessary, so I have dropped the feature.

 

[AndiL]

Guys, please, you are mixing up things a bit. Let me explain:

- The Taycan supports communication either via ISO15118-2 or via J1772/IEC61851 to the wallbox
- The Porsche Mobile Charger Connect supports ISO15118-2 to the car and EEBUS to a compatible HEMS
- The Porsche HEMS supports EEBUS to a compatible wallbox

Without these or compatible devices, it works as @Raphie said. The timers are only known to the EV and it will only charge as the EV defines it will with no additional data from the outside. The HEMS you have has no way of communicating with the Taycan and tell it about this dynamic tariffs.

IF you are using the devices mentioned, or devices that support the ISO15118-2 and EEBUS standards, it works very different. The owner enters the available fixed tariffs into the hems, it does not support fully 24h rolling dynamic tariffs but the standards support peak power tariffs. The owner defines timers for his needs and then the EV will communicate these timers via the wallbox to the HEMS and the HEMS will provide the costs (incl. depending power limits) to the EV so the EV can create a charging plan that has the lowest cost.

 

[whitex]

I guess this was on your long drive when you collected the car?
We’re all services in the Taycan activated, ie LTE and connect etc At the time when this happened?
I am surprised to read that you had such a large deviation at that time. Was the weather changing very rapidly and unexpected for you? Normally the car will take into account the expected weather through the weather app, once a route has been planned with charging stops.
Have you tried this out since that time even if only driving perhaps some 50 to 70 miles without the need to stop for a charge?

My experience in 40 k km has been the opposite. In all weathers, except an unexpected violent thunderstorm with heavy rain and hailstones, the planned SoC at destinations, have been within a few percentage points. 1 to 3 % difference normally. Largest observed deviation was about 5%, reason was I drove at much higher speed than I guess is in the plannner, on the German Autobahn.
Apart from this it has been very reliable in my case and I trust my car fully for long trips.

Yes it was on the picking-up-the-car trip. Yes, LTE was active, The car was picked up in a warm climate state. I drove in the warm climate for 3 days, then started hitting winter weather. The 25%+ overestimate happened in clear, sunny, but very cold weather, but all initial estimates were off by at least 10% even before then.

The car was new, so it had no history to base its estimates on, possibly provisioned by Porsche for warm climate like where it was delivered (similar to Porsche filling my windshield washer reservoir with fluid which freezes at even slightly freezing temps). It might have also been calibrated for an average Porsche driver - I prefer to push the car closer to the limits I paid for (within safe and legal limits of course), more fun that way. By the end of the trip the estimates were actually pretty close, so I figured it just bases its estimates on past driving. I still think if I was to drive far enough where the weather was much colder, it would start underestimating again, since my mileage estimator has been going up recently with the weather warming up.

 

[Raphie]

Yes a departure window could be a reason to.
I guess I’ve found out that one thing is not possible, or by (wrong) design.
the profile charge slider minimum value, initiates a immediate charging session, ignoring the HEM.
the HEM only kicks in ABOVE the minimum%

i.e. I put my standard profile on 85%, the car starts charging immediately at 27ct and will keep charging untill 85% has been reached. Today at 14:00 my tariff is 17ct. But the hem is ignored. Only when I put the slider below the current SoC the HEM kicks in, scheduling the session, but then it will keep charging until I stop it manually. Or the HEM thinks the price is to high.

So the ONLY way I can stop charging @85% remotely is by raising the slider on the app to 85% once I reach 85%. It is really effective a direct charging threshold, not a HEM cap.
I need to reach out to my provider so see if this is available in the API and it can be disclosed in their app as an option.

 

[whitex]

Guys, please, you are mixing up things a bit. Let me explain:

- The Taycan supports communication either via ISO15118-2 or via J1772/IEC61851 to the wallbox
- The Porsche Mobile Charger Connect supports ISO15118-2 to the car and EEBUS to a compatible HEMS
- The Porsche HEMS supports EEBUS to a compatible wallbox

Without these or compatible devices, it works as @Raphie said. The timers are only known to the EV and it will only charge as the EV defines it will with no additional data from the outside. The HEMS you have has no way of communicating with the Taycan and tell it about this dynamic tariffs.

IF you are using the devices mentioned, or devices that support the ISO15118-2 and EEBUS standards, it works very different. The owner enters the available fixed tariffs into the hems, it does not support fully 24h rolling dynamic tariffs but the standards support peak power tariffs. The owner defines timers for his needs and then the EV will communicate these timers via the wallbox to the HEMS and the HEMS will provide the costs (incl. depending power limits) to the EV so the EV can create a charging plan that has the lowest cost.

To an average consumer, clear as mud.

I get what you're saying, but all this should have been encapsulated in a proper user experience design, where the user does not need to understand all the intricacies of the system. I can't help but wonder what the charging settings would have looked like if Apple had designed it.

 

[AndiL]

The profile settings SoC is defined as the minimum SoC that should be reached as quickly as possible no matter the costs. The reasoning is that you will have a minimum range e.g. for emergency reasons.

Hence it does not makes sense for a compatible HEMS to interfere here. In this concept using timers is mandatory to charge at the lowest grid costs, but it expects to have a date and time a specific SoC has to be available. This scenario may fit to some people and may not to some other people.

For your own specific setup it may be helpful to know what wallbox and which HEMS you have and then it might be possible to make a suggestion on how set up things best.

Please do not use "HEM" as a generic fits everywhere system. HEM systems are widely different and depend a lot of the devices that are in use. What you are experiencing with your setup may be (and likely is) completely different to another setup with a "HEMS".

 

[AndiL]

To an average consumer, clear as mud.

I get what you're saying, but all this should have been encapsulated in a proper user experience design, where the user does not need to understand all the intricacies of the system. I can't help but wonder what the charging settings would have looked like if Apple have designed it.

One big problem is the wild differences in the available home charging setups being out there. What Porsche did is design the experience specifically/mostly on the basis of their new technology, being based on ISO15118-2 and EEBUS which includes their PMCC/PWCC and their HEMS. They started development on this in 2015 and where the first in the market to adopt these new open standards. Others are catching up, e.g. Mercedes also support ISO15118-2 and VW with their MEB platform (starting Software 3.2).

While their UX design is not optimal for sure, this is mostly the case for a first in market implementation. I do know that the engineers are aware of the complexity and problems and at some point there will be improvements made. I would be curious on how the new Macan SUV looks like, as I suspect that it would already include a new UX. Hopefully such a new UX will be made available to the Taycan as a software update as well.

 

[Raphie]

The profile settings SoC is defined as the minimum SoC that should be reached as quickly as possible no matter the costs. The reasoning is that you will have a minimum range e.g. for emergency reasons.

Hence it does not makes sense for a compatible HEMS to interfere here. In this concept using timers is mandatory to charge at the lowest grid costs, but it expects to have a date and time a specific SoC has to be available. This scenario may fit to some people and may not to some other people.

For your own specific setup it may be helpful to know what wallbox and which HEMS you have and then it might be possible to make a suggestion on how set up things best.

Please do not use "HEM" as a generic fits everywhere system. HEM systems are widely different and depend a lot of the devices that are in use. What you are experiencing with your setup may be (and likely is) completely different to another setup with a "HEMS".

HEM > Home Energy Manager (in my case Tibber) I’m not confusing the definition. It’s now 10:00, it will start charging at 13:00, as long as my minimum charge slider in std profile is < current SoC.
what I want is to set a cap in the HEM to 85%, but this is currently not possible.

 

[AndiL]

@Raphie I know a lot of products are called HEMS with some kind of similar features but also with a widely different set of capabilities and protocols that are being supported. So when someone uses a Porsche HEMS and you are using a Tibber HEMS, they work completely different and provide a completely different set of features. That's what I mean, just saying you have some kind of HEMS can not be compared to what kind of HEMS someone else might have installed.

What exact product is this and what wallbox/charger are you using?

 

[Raphie]

@Raphie I know a lot of products are called HEMS with some kind of similar features but also with a widely different set of capabilities and protocols that are being supported. So when someone uses a Porsche HEMS and you are using a Tibber HEMS, they work completely different and provide a completely different set of features. That's what I mean, just saying you have some kind of HEMS can not be compared to what kind of HEMS someone else might have installed.

What exact product is this and what wallbox/charger are you using?

They work via directly the Porsche API, the wallbox is dumb, so it’s the same communication protocol, leveraging the same options in the API, the HEM is connected to myporsche Account

 

[AndiL]

Ok, that is a completely different API and communication protocol compared to what the Taycan uses with a PMCC and the Porsche HEMS. Those can not be compared at all.

I assume it can enable/disable "Direct Charging". To use that you need to use a profile and set the SoC target to the minimum possible at 25%. The HEMS will then enable/disable charging at its will. It can not influence the charging until 25% though.

Update: And maybe use a location based profile for that.

 

[Raphie]

Correct, the issue being an absolute smart charge cap of 85% not being foreseen. In either the myporsche app or the Tibber app.

I’ve mailed Tibber to see if this can be implemented if disclosed by API, if not I’ll contact Porsche Support. I expect to have my cake and eat it: Cost optimized charging, while still capped at 85%

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