Nema 14-50 charge rate.

[Gigahorse]

its definitely plenty enough for us to make it back to civilization,
I originally planned this with getting a rental suv, but I got the call to be able to pickup the truck the morning that we were going to depart so it worked out and I had the entire plan routed on PlugShare before I even knew that I was going to get the truck.

A truck is made for work and adventuring, a lot of cool places out there outside the city center where there are superchargers every 30miles. Get out there and enjoy it, just keep an eye on that range

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[ÆCIII]

AWD Foundation Series
Traveled to Oklahoma first day I got it. No chargers here. However there is an RV park on the south side of town that’s listed on PlugShare for having rates to use mobile charger in the back.
Talked to the nice lady at the front desk, pulled around back, plugged in and started charging.
Bad part of the experience is that the charge rate on this is being inconsistent.
bouncing from 25mi/hr- 11mi/hr charge rate.
5.5 hours to charge from 40%-80%
9 hours 40%-100%
This is my first electric vehicle. Is it common to have the charge rate not sit at a consistent level?

From my experience with other Teslas, it will sometimes start out low and climb but usually stay stable (if the power source itself is stable).

You were at an RV park, so it's uncertain how stable their power was. Your current/power variations were likely not caused by the Cybertruck.

Your screen was showing 32 amps. For a NEMA 50 outlet or 50 amp circuit, you could normally get up to 40 amps out of it if a destination charger wall connector was on it. But since you were using the UMC adapter with an outlet it limits the current to 32 amps max.

But if you find a Tesla destination charger, you might be able to get a little more current depending on their source amperage, because you will not have to connect the UMC adapter in that situation. I've used some hotel destination chargers that provided 40 amps.

I don't know for certain what the max AC current the Cybertruck onboard charger will accept, because I could not find it in the Cybertruck Owners Manual. But it's probably at least 48 amps (utilizing a 60 amp circuit) like the Model 3/Y charging ports are. I'm hoping it's a little more, but Gen III Wall Connector will only allow 48 amps max anyway, whereas the Gen II Wall Connector will allow higher amperages. This extra current capacity was used in some earlier Model X variants that would accept up to 72 amps.

I've attached two PDF files from the Tesla website which are the manuals for Gen II and Gen III Wall Connectors.

- ÆCIII

 

[webspeedracer]

It’s the RV park wiring.

Lev 2 charge rates don’t fluctuate that much, even with a ~40° battery. It’s in DCfast charging situations that the car will use lower power to pre-heat the battery, bring it up to temp, before allowing full power.

I’ve used a lot of RV parks due to towing a 19’ FG camper (with an MX100D) across the country, throughout the Rockies, desert southwest. Coincidentally, I got stuck in OK for 30 hours because the RV park I had planned to stop overnight on I-40 didn’t have any functional 240V receptacles, had to charge at 120V forever. I have every adapter in the frunk

OP where are you in OK? One of the other posters on here is correct; if you can find a 16kW (80A) Tesla Destination charger you’ll regain range much more quickly.

One suggestion: buy the (ridiculously large but helpful in emergencies) Chademo adapter for your adventures into charging deserts. Maybe have it FedExed to somewhere on your trip (I’m fingers-crossed the Chademo adapter works with CT)? I’d suggest the CCS1 adapter (because 3-4x faster) but Out of Spec Kyle discovered CT can’t use that adapter yet.

Final tip: Check PlugShare and/or reach out to Oklahoma owners on Teslamotorsclub for help…gotta be someone on the app or the forum who would let you plugin to their home charger (and get a sweet preview of the CT in the wild)!

good luck.

AWD Foundation Series
Traveled to Oklahoma first day I got it. No chargers here. However there is an RV park on the south side of town that’s listed on PlugShare for having rates to use mobile charger in the back.
Talked to the nice lady at the front desk, pulled around back, plugged in and started charging.
Bad part of the experience is that the charge rate on this is being inconsistent.
bouncing from 25mi/hr- 11mi/hr charge rate.
5.5 hours to charge from 40%-80%
9 hours 40%-100%
This is my first electric vehicle. Is it common to have the charge rate not sit at a consistent level?

 

[bwhntr78]

In both photos, the on-screen display shows a 32A charge. That seems consistent.

The difference is in the "miles per hour", which is not a measurement but a calculation based on the rate of charge and the expected Wh/mile efficiency.

I would speculate that the BMS is still calibrating, and/or is using sloppy mathematics that cause the number to jump around instead of using a smoother averaging technique.

Haven't you ever downloaded something with a consistent speed, yet it would jump all over the place with "X minutes remaining" that was never right?

The first part about the 32 amps in both pictures is correct and indicates that there is no issue with the power at the site.

But the fluctuation in the miles/hour being added is much more likely due to power being consumed by climate control and/or battery conditioning than a bms issue. The amps displayed is what is coming into the truck from the charger, the miles displayed is the net going into the battery.

 

[ButterEV]

AWD Foundation Series
Traveled to Oklahoma first day I got it. No chargers here. However there is an RV park on the south side of town that’s listed on PlugShare for having rates to use mobile charger in the back.
Talked to the nice lady at the front desk, pulled around back, plugged in and started charging.
Bad part of the experience is that the charge rate on this is being inconsistent.
bouncing from 25mi/hr- 11mi/hr charge rate.
5.5 hours to charge from 40%-80%
9 hours 40%-100%
This is my first electric vehicle. Is it common to have the charge rate not sit at a consistent level?

Ok so I charged my CT for the first time yesterday on a Tesla wall connector and I was getting fluctuating mi/hr as well. I’ve owned multiple Teslas and have used all of them with the wall connector for years and have never seen this. I thought it was really odd. I’ll be showing this in an upcoming YT video. I’d have to believe that they’ll be able to push a software update to correct this. At least that’s my hope

 

[PilotPete]

The first part about the 32 amps in both pictures is correct and indicates that there is no issue with the power at the site.

But the fluctuation in the miles/hour being added is much more likely due to power being consumed by climate control and/or battery conditioning than a bms issue. The amps displayed is what is coming into the truck from the charger, the miles displayed is the net going into the battery.

Are we sure about this? Here is why I ask...

My wife has a PHEV with a 16amp max charging rate. Fortunately, the battery only has a 32 mile range, so it charges completely in 3 -4 hours. So when I added the 220v circuit, I added a 20A breaker. The L2 charger I bought will go up to 40A, but is still only fed by a 20A breaker. When I plug in a rented M3 (with an adapter) I believe it was showing a 32A charge rate. I assumed this is because it was set to accept a 32A charge in the "Charging" portion of the car setup. I'm renting another M3LR this week, so I'll double check. But there is no way it's pulling 32A at my house.

 

[bwhntr78]

Are we sure about this? Here is why I ask...

My wife has a PHEV with a 16amp max charging rate. Fortunately, the battery only has a 32 mile range, so it charges completely in 3 -4 hours. So when I added the 220v circuit, I added a 20A breaker. The L2 charger I bought will go up to 40A, but is still only fed by a 20A breaker. When I plug in a rented M3 (with an adapter) I believe it was showing a 32A charge rate. I assumed this is because it was set to accept a 32A charge in the "Charging" portion of the car setup. I'm renting another M3LR this week, so I'll double check. But there is no way it's pulling 32A at my house.

I'm assuming/hoping that the charger you are using is set to only output 16A continuous if it is connected to a 20A breaker. In that case, even if the Tesla is set to charge at 32A max, it will only pull 16. The display on the car would then show 16/32A. To be safe, you can also set the car to only accept 16A. If using a tesla mobile connector with the appropriate plug, it will automatically limit itself to the appropriate max output.

I park in an attached garage that stays above freezing and have still seen what I described above during preconditioning. My friend has a 30A circuit in a detached garage and in sub zero temps the 24A continuous wasn't even enough to maintain battery levels let alone add charge for the first 15 minutes or so while the car was trying to warm both the cabin and battery.

 

[Crissa]

The rate at the plug is consistent, if the supply is consistent.

What's always not consistent is:

1. The amount of power the vehicle is drawing for onboard systems (like the battery heater, if it's cold out)
2. The amount of amperage at the cell level while the voltage rises in the charge curve.

These two things will vary based upon all sorts of things, but to store kWhs in a battery cell, it needs a voltage slightly higher than its resting voltage. As the charger runs, it slowly alters the voltage flowing into the battery - but since the amperage and voltage at the plug won't change, that means the amperage necessarily has to get slightly lower. This creates a curve when charging.

The charge curve from DC charging is limited similarly, but also by the maximum rate the cells can absorb and a few basically weather-related things that don't really happen when you're charging at Level 2 rates.

-Crissa

 

[rrolsbe]

Could be battery temperature as well. However, once the battery warms up a little bit, it tends to stay at a steady rate

Don't' know if the Cybertruck has a similar service menu interface as the newer Model 3/Y vehicles? If it does, go into service mode and choose the charging tab. This will show the voltage/amperage of the charging source for both AC L2 and DC fast charging. You should be able to monitor this to verify if the L2 charging source voltage/current is stable. If it is not stable, then the L2 power source might be suspect or the Cybertruck is asking for varying power levels for some other reason. Also, the 14-50 heat sensor on the mobile charger could be getting too hot which could cause the amperage delivered to the Cybertruck to vary.

 

[Cybertruck 1974]

AWD Foundation Series
Traveled to Oklahoma first day I got it. No chargers here. However there is an RV park on the south side of town that’s listed on PlugShare for having rates to use mobile charger in the back.
Talked to the nice lady at the front desk, pulled around back, plugged in and started charging.
Bad part of the experience is that the charge rate on this is being inconsistent.
bouncing from 25mi/hr- 11mi/hr charge rate.
5.5 hours to charge from 40%-80%
9 hours 40%-100%
This is my first electric vehicle. Is it common to have the charge rate not sit at a consistent level?

did you prep battery before charging?

 

[Outdoors]

did you prep battery before charging?

One does not prep a battery at that C rate. This isn't supercharging, barely home charging.

 

[Cybertruck 1974]

One does not prep a battery at that C rate. This isn't supercharging, barely home charging.

oh? I thought you should in colder temps? Saw that on Out of Spec post and in manual for CT?

 

[Outdoors]

oh? I thought you should in colder temps? Saw that on Out of Spec post and in manual for CT?

That makes no sense. If one is heading to a supercharger on a trip sure. Truck knows. It will say preconditioning for supercharging. One does not have to do anything.

At home or anything else the car's BMS will do the work.

Just trying to help. Many watch these youtube videos. It was -41 here a week or so ago. I still needed to charge. I would have to drive for 3 years to get up to supercharging speeds. Yet I still charge no problem at 9kW at minus -32 in a garage however where it is 0.

 

[Cybertruck 1974]

That makes no sense. If one is heading to a supercharger on a trip sure. Truck knows. It will say preconditioning for supercharging. One does not have to do anything.

At home or anything else the car's BMS will do the work.

hmm. ok. thanks. but you said if one is heading to a supercharger....sure. so make sense or not? Dont' have to answer. the battery is capable of automatically conditioning and stay conditioned during cold temps. We all know that but.....you do have an option to pre condition the battery so it will charge at a steady rate and if super charging absolutely you should have conditioning on. ok so were are agreeing. cool.

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