Level 2 Charging Dips

[unhandled]

I've been noticing during the last few charges dips while the car is charging with my Grizzl-E Smart and I was wondering if people noticed the same thing with the Grizzl-E or other EVSE.

Thanks!

Here are a few examples:

At 40 amps

I had to downgrade to 32 amps due to the electrician passing 8/3 wire instead of 6/3 until he comes to swap the wire. I've noticed the same behavior there as well:

I'm also curious about this curve where you can see the charge dropping from 32 amps to around 6-7 to finish. Note that I'm currently set to charging to 90% SoC.

 

[bshaw]

What is the unit of timestamp on your x-axis? Is it minutes, seconds, etc?

 

[Nklem]

It happens on level 2 with my Chargepoint 32A too. It's the car taking a break for a few minutes. I have not charged enough to determine regularity.

 

[benk016]

I have a chargepoint, and I haven't ever seen this behavior. Although I think the chargepoint only refreshes every 5 minutes so its possible it happens and doesn't get recorded on their graphs.

This is what all my charges look like. Solid at a bit over 11kw. If I do a full charge to 100% you'll see it dip as it nears 100%.

 

[generaltso]

The ChargePoint app doesn't sample quickly enough to catch this, but I see the same behavior when looking at my power usage in the Sense app. Interestingly enough, I also seem the same exact behavior when charging the RAV4 Prime with the Pulsar Plus. Maybe all EVs do this?

 

[unhandled]

What is the unit of timestamp on your x-axis? Is it minutes, seconds, etc?

I'm not 100% sure but I believe those would be minutes.

 

[unhandled]

The ChargePoint app doesn't sample quickly enough to catch this, but I see the same behavior when looking at my power usage in the Sense app. Interestingly enough, I also seem the same exact behavior when charging the RAV4 Prime with the Pulsar Plus. Maybe all EVs do this?

Thanks for sharing your experience about that.

I find odd to see sharp dips like that. I would expect thermal throttling from the BMS to be a little softer or to manage that more proactively. If it's thermal related, it would be weird that it would recover/fix that condition within a minute or so.

Not a a problem in practice for me but I still find that strange. Does that happen with level 3 charging as well?

 

[AZBill]

The dip at the end of the charge will be when the cells are near the set voltage and are balancing. If you go to 100% you do not want any cells going above the maximum voltage, typically 4.2V. With the battery buffer in the Mach E it may be a lower voltage than that, or when you set the target charge to less than 100% it will also be lower.

 

[unhandled]

I have a chargepoint, and I haven't ever seen this behavior. Although I think the chargepoint only refreshes every 5 minutes so its possible it happens and doesn't get recorded on their graphs.

This is what all my charges look like. Solid at a bit over 11kw. If I do a full charge to 100% you'll see it dip as it nears 100%.

FYI I did get charging sessions where the current delivered was more stable.

but it doesn't seem constant.

i.e. the following seems to show dips at fairly regular interval. Could it be time based?

 

[unhandled]

The dip at the end of the charge will be when the cells are near the set voltage and are balancing. If you go to 100% you do not want any cells going above the maximum voltage, typically 4.2V. With the battery buffer in the Mach E it may be a lower voltage than that, or when you set the target charge to less than 100% it will also be lower.

From what I'm seeing in the different charge sessions, this seems to happen at different SoC levels. I also don't go above 90% SoC.

You do bring good insights still.

 

[Mach-Lee]

The ChargePoint app doesn't sample quickly enough to catch this, but I see the same behavior when looking at my power usage in the Sense app. Interestingly enough, I also seem the same exact behavior when charging the RAV4 Prime with the Pulsar Plus. Maybe all EVs do this?

No, there should not be periodic dropouts. Only the ramping down above 80%.

Curious if you folks with dropouts have had any of the powertrain update TSBs done or not? This could be a software issue with the SOBDM. Getting the cooling fan noise TSB done would ensure you have the latest software and we could see if that changes any behavior.

The EVSE being flaky is also a possibility. Since you have Sense, I'd try the mobile charger and see if it does it still or not.

 

[unhandled]

No, there should not be periodic dropouts. Only the ramping down above 80%.

Curious if you folks with dropouts have had any of the powertrain update TSBs done or not? This could be a software issue with the SOBDM. Getting the cooling fan noise TSB done would ensure you have the latest software and we could see if that changes any behavior.

The EVSE being flaky is also a possibility. Since you have Sense, I'd try the mobile charger and see if it does it still or not.

Good point about the fan TSB. On my end no TSBs were done after delivery (which happened at the end of July). I received the 1.4, 1.6 Power Ups but that's it.

 

[Carsinmyblood]

Automotive nomenclature is rapidly changing from oil viscosity, rpm's and octane to amps, current and wire gauge.

 

[ncaadam]

just want to add my experience here as well. look at this curve. noticed this the other day. has only happened once

I didn't really think much of it because I see this most regularly.

 

[generaltso]

No, there should not be periodic dropouts. Only the ramping down above 80%.

Curious if you folks with dropouts have had any of the powertrain update TSBs done or not? This could be a software issue with the SOBDM. Getting the cooling fan noise TSB done would ensure you have the latest software and we could see if that changes any behavior.

The EVSE being flaky is also a possibility. Since you have Sense, I'd try the mobile charger and see if it does it still or not.

I have an appointment for the fan TSB next week, so that hasn't been done yet.

But I'm seeing the same behavior with a completely different car using a completely different EVSE, so I don't think either of those could be the cause. It doesn't increase the charging time or seem to cause any issues, so I'm wondering if other people with a way to monitor their power usage in realtime would see the same thing. Like I said, I don't see these dips in the ChargePoint app at all because they only last for a few seconds and ChargPoint only samples every few minutes.

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