Yet another charging query......................

[Biggles]

Chargers are Simpson and Partners Home 22kW chargers - these have an optional additional Energy Manager which I have but it doesn't work and the manufacturer is aware as there is an issue with the 22kW version.
Octopus is the energy provider and I am on Octopus 12M Fixed for import and export.

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[tophamn]

Octopus is the energy provider and I am on Octopus 12M Fixed for import and export.

OK, thanks for confirming. As you're on a fixed timing tariff there's no benefit in having Octopus control the charging periods.

Many on here (me included) are on Intelligent Octopus Go where they can extend the cheap charging period depending on how much charge you request and leave-by time - but this depends on Octopus controlling the wall box. Integration with the car directly seems to be much more hit-n-miss.

 

[Biggles]

Understood - this is the best option for me as I have to also balance feed in tariffs as we generate our own power most of the year. Charging is only an issue when the sun disappears over Winter.

 

[tophamn]

Understood - this is the best option for me as I have to also balance feed in tariffs as we generate our own power most of the year. Charging is only an issue when the sun disappears over Winter.

I generate, too, but don't export much. That said it's better for me to export at 15p during the day then charge from the grid overnight at 7p .

 

[Biggles]

I have good news - and bad, to report.

The charging sort of worked. I had the requisite 85% this morning, it had stopped charging by the time I got to the car at 06:00 (the charging was set to end at 05:30) - so this is good.

However, when I looked at my home energy usage I noted that the car began charging BEFORE the required 00:30 start time.

It looks therefore that we haven't yet found a solution to charging between fixed start and finish times?!?!?

Is this even possible?

 

[tophamn]

I have good news - and bad, to report.

The charging sort of worked. I had the requisite 85% this morning, it had stopped charging by the time I got to the car at 06:00 (the charging was set to end at 05:30) - so this is good.

However, when I looked at my home energy usage I noted that the car began charging BEFORE the required 00:30 start time.

It looks therefore that we haven't yet found a solution to charging between fixed start and finish times?!?!?

Is this even possible?

What was your charge % when you plugged? - the car will commence charging immediately to achieve the minimum charge as set in the profile, irrespective of the timer.

 

[Biggles]

Charge was at 26% and the minimum was set to 25% as instructed.

The car started charging about 2hours after i got home and plugged in.

 

[tophamn]

Charge was at 26% and the minimum was set to 25% as instructed.

The car started charging about 2hours after i got home and plugged in.

Note in the profile it says "preferred charging period" - as @Speuk noted a few posts ago:

However the car will decide when to start charging to reach your desired soc by 05.30 which might be before 00.30 if the battery is low.

I have no idea how the car decides this - maybe historical charging data?

 

[Speuk]

I have good news - and bad, to report.

The charging sort of worked. I had the requisite 85% this morning, it had stopped charging by the time I got to the car at 06:00 (the charging was set to end at 05:30) - so this is good.

However, when I looked at my home energy usage I noted that the car began charging BEFORE the required 00:30 start time.

It looks therefore that we haven't yet found a solution to charging between fixed start and finish times?!?!?

Is this even possible?

That's because you needed to add approx 50kwh to charge from 26% to 85%. It will have charged at around 6.8kw/hour so needed to charge for around 7 hours and 20 mins thus it had to start before 00.30 hours reach the required soc by 05.30 hours. It will have allowed some contingency to compensate for charging rate slowing as the battery nears capacity.

 

[SergeyIndy]

I have good news - and bad, to report.

The charging sort of worked. I had the requisite 85% this morning, it had stopped charging by the time I got to the car at 06:00 (the charging was set to end at 05:30) - so this is good.

However, when I looked at my home energy usage I noted that the car began charging BEFORE the required 00:30 start time.

It looks therefore that we haven't yet found a solution to charging between fixed start and finish times?!?!?

Is this even possible?

This would be my explanation for what's happening here.

If Profile set to 25% with Preferred Charging window 0:30 - 5:30 then if the car is below 25% then it will start charging immediately to reach 25% and then stop. At this point, the Profile instruction is done including Preferred Window no longer applies. Then it looks to the Timer that is set to 80% by 5:30, then the car detects the rate of charge (mine does) and calculates how much time it needs to get there so let's say it needs 6 hours, then it will start charging at 5:30 - 6 hours.

My advice would be to do the following:

Profile set to 80% with Preferred Window 0:30 - 5:30 and Timer set to 80% by 5:30.
Then the expected behavior would be that the car will charge to 25% immediately when plugged in if SoC is below 25%, then stop, restart charge at Preferred Window time to reach 80%. However, if it is not at 80% by 5:30, I do not know what happens if it continues past 5:30 or stop at that point.

 

[Biggles]

Thank you everyone - I just cant believe there isn't an option to state specific on/off times for charging?

I have 22kW chargers so if the SOC is less than 25% when I plug in I do NOT want the car to start drawing energy at nearly four times the £/kWh rate I get between 00:30 and 05:30.

My other EV's have the capability to set simple on/off times. I never dreamed that Porsche wouldn't have this an option.

Thank you all again, but it looks like a defined set of on/off times isn't possible.

 

[SergeyIndy]

Thank you everyone - I just cant believe there isn't an option to state specific on/off times for charging?

I have 22kW chargers so if the SOC is less than 25% when I plug in I do NOT want the car to start drawing energy at nearly four times the £/kWh rate I get between 00:30 and 05:30.

My other EV's have the capability to set simple on/off times. I never dreamed that Porsche wouldn't have this an option.

Thank you all again, but it looks like a defined set of on/off times isn't possible.

I would have to agree. I do not think there is a way to say only charge during this time.

 

[tophamn]

I have 22kW chargers...

Does your Taycan have the optional 22kW AC charger? - if not it's limited to 11kW on AC, irrespective of your wall box.

 

[SergeyIndy]

Does your Taycan have the optional 22kW AC charger? - if not it's limited to 11kW on AC, irrespective of your wall box.

Good point!

 

[DBI]

Thank you everyone - I just cant believe there isn't an option to state specific on/off times for charging?

I have 22kW chargers so if the SOC is less than 25% when I plug in I do NOT want the car to start drawing energy at nearly four times the £/kWh rate I get between 00:30 and 05:30.

My other EV's have the capability to set simple on/off times. I never dreamed that Porsche wouldn't have this an option.

Thank you all again, but it looks like a defined set of on/off times isn't possible.

Half the fun of a Taycan is the mental maths you have to do. Presumably the car is charging at 11kW/h, so based on the state of charge when you connect in the evening, work out what the percentage charge will be at 05:30 given you don't want charging to start before 00:30. Rather than setting the profile to charge to 80%, you may need to set the target to 70% in order for charging to begin after 00:30. If you have batteries for solar you can add to the fun by calculating how many kW you lose between batteries and car too, or factor in pre-conditioning....

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