Electrician just wired a NEMA 14-30 receptical to a 240V 30A breaker. 10/3 cable approximately 40 feet. I'm using the latest Tesla Mobile Connector with the NEMA 14-30 adapter. The documentation shows an expected charging rate of 21 miles per hour, 33 KM. My Model Y LR is only ever charging at 17 KM/Hr. Charging indicates 24/24A and 117V but only 17 km/hr charging speed. Any thoughts on why I'm not getting ~33 km/hr? Thanks a lot.
-
Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
-
On today's TMC Podcast, we ask the question "What is the Tesla Cybercab?". Join us on YouTube live at 1PM and participate in the chat.
Very Slow Charging
- Thread starter jenimolly
- Start date
-
- Tags
- 14-30 slow charge
Who cares about "km/hr" or whatever? That's a Tesla-centric measure and will vary depending on the vehicle + other factors (supply voltage (which has some variance) and amperage).
117 volts * 24 amps = 2808 watts = 2.808 kW. So, for each hour, ~2.808 kWh comes out of the wall.
If you had 240 volt input, on a 30 amp circuit, you should be able to do 24 amps max continuous. 240 volts * 24 amps = 5760 watts = 5.76 kW. For each hour, about 5.76 kWh comes out of the wall.
If you have a volt meter, you can measure whether you're getting 240 volts at that outlet. I suspect no.
MANY other EVs/PHEVs don't have any UI anywhere that says "km/hr" or "miles per hour" for charging speed. None of mine ever have and I'm on my 4th pure EV (2 were the same model). This is across 3 different automakers: Japanese, American and Korean.
117 volts * 24 amps = 2808 watts = 2.808 kW. So, for each hour, ~2.808 kWh comes out of the wall.
If you had 240 volt input, on a 30 amp circuit, you should be able to do 24 amps max continuous. 240 volts * 24 amps = 5760 watts = 5.76 kW. For each hour, about 5.76 kWh comes out of the wall.
If you have a volt meter, you can measure whether you're getting 240 volts at that outlet. I suspect no.
MANY other EVs/PHEVs don't have any UI anywhere that says "km/hr" or "miles per hour" for charging speed. None of mine ever have and I'm on my 4th pure EV (2 were the same model). This is across 3 different automakers: Japanese, American and Korean.
Last edited:
What temperature is it where your car is parked right now? if the car is reporting 24/24 then it sees the appropriate amperage. The km/hr metric also reduces because power is going "somewhere else" like battery heating.
117 volts is pretty suspect if the OP is expecting 240 volts.
Temperature outside is 5 degrees celsius. Vehicle parked in garage. Nothing running in vehicle.
Thank you. Should I expect to see 240V as opposed to 117? This info is displayed both at vehicle screen and android app.
I've never owned nor leased a Tesla (been driving BEVs as my primary vehicle since end of July 2013) but yes. I've briefly seen other people's Tesla apps and vehicles while charging besides screenshots. And, I've had other Tesla drivers report that they see ~208 volts when L2 charging at my work. 208 volts is the supply voltage for our work EVSEs and is common for commercial power in the US.
Yes, it should say 240 or close to it there. if it doesnt, time for the OP to get the electrician that installed it back out.
That was the issue. Quick fix for electrician and now all good. Thanks everyone.
I'd be putting that electrician on my do-not-call list. I don't care how nice or cheap he was(or even if he was a relative that was free), that's just sloppy and dangerous work. Other equipment may well have been damaged, seeing 240V between L1 or L2 and 'Neutral'.
No harm; just charged at 117V instead of ~240V as expected. If there had been a greater issue with the charging circuit such as a bad/missing ground connection then the Tesla Mobile Connector would have displayed error light(s) and disabled the charging session.
davewill
Active Member
davewill
Active Member
Well, it's disappointing that they would both miss a mistake that. Had you plugging anything that needed the neutral, you would have likely ruined it.
I am glad people ask good questions here, and that people give good answers instead of just (as a few people did) saying "don't use mile or km per hour to measure how fast you are charging".
If the OP hadn't asked we would not have diagnosed his problem and he not only would have been charging at half the KW he should have been getting, he also would have had a dangerously miss-wired plug in his house that could have caused harm to equipment or injury to people if it had not been corrected.
One of the reasons that problem got solved was the OP gave good information (mile / km charged per hour, voltage, and amps)... one of the responders (same one that always complains about units / using mile or km per hour as a measure of charging) noting the low voltage is what lead to the solution of the problem... this is why I forgive cwerdna his units mania... he gives good information if you can get past his mania... If I see him in a thread I use incorrect units just to tease him
Keith
If the OP hadn't asked we would not have diagnosed his problem and he not only would have been charging at half the KW he should have been getting, he also would have had a dangerously miss-wired plug in his house that could have caused harm to equipment or injury to people if it had not been corrected.
One of the reasons that problem got solved was the OP gave good information (mile / km charged per hour, voltage, and amps)... one of the responders (same one that always complains about units / using mile or km per hour as a measure of charging) noting the low voltage is what lead to the solution of the problem... this is why I forgive cwerdna his units mania... he gives good information if you can get past his mania... If I see him in a thread I use incorrect units just to tease him
Keith
Last edited:
ucmndd
Well-Known Member
This is a mantastically impressive number of needless gender pronouns for forum users named “jenimolly” and “cwerdna”.
Similar threads
- Question
