[buddenfan]

Yesterday had someone come to setup home charging and install an Emporia wall box.

After we finished we plugged it in to test and set it at 50amp breaker in the Emporia app. However we were only getting 8kw which seems very low and slow

[ggalanis]

Originally Posted by buddenfan

Yesterday had someone come to setup home charging and install an Emporia wall box.

After we finished we plugged it in to test and set it at 50amp breaker in the Emporia app. However we were only getting 8kw which seems very low and slow

Um your pic suggests it was actually charging at 48 amps when you took it which would be over 11kW.

The 8 ish kWh it is showing on the left seems to require actually sustaining a power level it for 15 minutes which you hadn't done yet based on that screenshot.

Now, you mentioned setting up as if you had a 50 amp breaker... If that is actually the case you need to limit the charger to output max 40 amps. You shouldn't be drawing 48 from it.

[BritInTheUSA]

Originally Posted by ggalanis

Now, you mentioned setting up as if you had a 50 amp breaker... If that is actually the case you need to limit the charger to output max 40 amps. You shouldn't be drawing 48 from it.

This! You should not draw more than 80% of the breaker rating. So at 50A breaker should draw 40A. For 48A you need a 60A circuit.

On a 40A draw (50A circuit) then around 8.8kwh is max you can theoretically get at 220v nominal.

[buddenfan]

At a certain point we set it to 60amp on the app and it was charging faster but he said it might overload and if it does to set it back to 50amp

[buddenfan]

Originally Posted by ggalanis

Um your pic suggests it was actually charging at 48 amps when you took it which would be over 11kW.

The 8 ish kWh it is showing on the left seems to require actually sustaining a power level it for 15 minutes which you hadn't done yet based on that screenshot.

Now, you mentioned setting up as if you had a 50 amp breaker... If that is actually the case you need to limit the charger to output max 40 amps. You shouldn't be drawing 48 from it.

Ahh I didnt know there was a 15 min rule? We put it for 4-5 minutes just to make sure it was charging

[Pictor]

Agree with BritInTheUSA that you should be getting 40amp to the car on a 50amp circuit. The car will show 9kW at 40amp delivered to the vehicle using a 50amp circuit at 240v which is the standard for most homes in the USA. KW = (V x A) / 1000

For 48amp delivery, you'll need a hardwired charger (EVSE) on a 60amp circuit. That will give you 11.5kW.

You shouldn't be getting 48amp of energy delivered to the vehicle from a 50amp circuit. If you are, you're risking overloading the circuit. And in all honesty, the risk isn't worth the extra time saved charging. A 9kW (9.6kW) EVSE will not be significantly different in real world use given you're typically charing up overnight. I know, I have one of each in my garage and it doesn't matter which I plug into, by morning my car is charged to my target SoC using either the 9.6kW or 11.5kW EVSE.

[LVBMW]

I hope this “someone” that installed it was a qualified electrician. It doesn’t sound like it based on the advice they’re giving you. As everyone else said, if it’s a 50 amp breaker it’s unsafe to charge at more than 40 amps. It’ll still easily charge overnight, so why take the risk?

[ggalanis]

Originally Posted by buddenfan

At a certain point we set it to 60amp on the app and it was charging faster but he said it might overload and if it does to set it back to 50amp

If it was installed using the wiring and breaker for a 50A circuit and the installer told you to set the EVSE to 60 amps so that it could pull 48A, the whole point is that it actually will not trip the breaker. That circuit can handle a spike of up to (and probably a bit over) 50A but it is not designed to have a sustained draw at 48A for possibly 10h at a time. The wires and even the breaker in the panel can eventually overheat and your house could burn to the ground as a result.

That's why you are supposed to stay at or below 80% of the amperage limit of a circuit for an application that will use a continuous draw of electricity.

[Windshieldfarmer]

Perhaps the wall box is “smart” and is able to determine impedance based circuit readings; as others have said…40 amp max on 50 amp circuit though wiring size might be contributing to additional limitations. I’m out of my wheelhouse a bit but if you have 8 awg wiring I suspect even 40 amp might be a push.

[exxxviii]

Originally Posted by Windshieldfarmer

Perhaps the wall box is “smart” and is able to determine impedance based circuit readings; as others have said…40 amp max on 50 amp circuit though wiring size might be contributing to additional limitations. I’m out of my wheelhouse a bit but if you have 8 awg wiring I suspect even 40 amp might be a push.

Nope. Impedance has nothing to do with circuit rating and breaker size. The EVSE cannot detect the circuit’s rating per electrical code.

[Windshieldfarmer]

Originally Posted by exxxviii

Nope. Impedance has nothing to do with circuit rating and breaker size. The EVSE cannot detect the circuit’s rating per electrical code.

Just an uneducated throry….

[exxxviii]

Originally Posted by Windshieldfarmer

Just an uneducated throry….

Rereading my post, I think it comes off harsher than I meant.

I did not have anything more I could add to the prior posts. This install may be flawed. If the electrician really did say it was OK to run at 48A on a 50A circuit, I question whether the circuit is even rated for continuous load at 40A.

[Windshieldfarmer]

Originally Posted by exxxviii

Rereading my post, I think it comes off harsher than I meant.

I did not have anything more I could add to the prior posts. This install may be flawed. If the electrician really did say it was OK to run at 48A on a 50A circuit, I question whether the circuit is even rated for continuous load at 40A.

Your post was fine…and certainly it would be risky to run a 48A load on a 50A circuit for any duration of length.

[NomoTesla]

What is the amperage of the circuit breaker?

[Paladin1]

Most cities require an electrical permit for an EVSE installation, and a follow-up inspection. Your HOA, if any, may require them as well. You can of course bypass any of these, but a reputable installer wouldn't. And if anything should happen as a result of said installation, your insurance company would be very interested in seeing them. Just as a point of information.

[LVBMW]

Originally Posted by Paladin1

Most cities require an electrical permit for an EVSE installation, and a follow-up inspection. Your HOA, if any, may require them as well. You can of course bypass any of these, but a reputable installer wouldn't. And if anything should happen as a result of said installation, your insurance company would be very interested in seeing them. Just as a point of information.

THIS!! ^^ 100%. Needed a permit here with plans and load calculations plus a follow up inspection before it could be used. Hopefully OP used a licensed electrician.

[buddenfan]

Originally Posted by ggalanis

Um your pic suggests it was actually charging at 48 amps when you took it which would be over 11kW.

The 8 ish kWh it is showing on the left seems to require actually sustaining a power level it for 15 minutes which you hadn't done yet based on that screenshot.

Now, you mentioned setting up as if you had a 50 amp breaker... If that is actually the case you need to limit the charger to output max 40 amps. You shouldn't be drawing 48 from it.

This is the setting I have it on in the Emporia app

[NomoTesla]

Doesn't anyone think it strange that OP won't tell any of us his breaker rating?

[ggalanis]

Originally Posted by NomoTesla

Doesn't anyone think it strange that OP won't tell any of us his breaker rating?

he didn't explicitly say it but if I read between the lines, it would be 50A. But if buddenfan can directly confirm this, it will put our minds at ease that he isn't risking a fire at his house.

[buddenfan]

Originally Posted by ggalanis

he didn't explicitly say it but if I read between the lines, it would be 50A. But if buddenfan can directly confirm this, it will put our minds at ease that he isn't risking a fire at his house.

Yes its a 50amp breaker and on the emporia app I set it to 50amp

I dont know why it was showing 48a

[Kennethjk]

Every time I start a charge on a new AC charger I have to change the amp from 6 to max 48, quite annoying, has nothing to do with your issue but just the same.

I have tried to change it in the app and in the car to the max but none of them stick

[BritInTheUSA]

Originally Posted by Kennethjk

Every time I start a charge on a new AC charger I have to change the amp from 6 to max 48, quite annoying, has nothing to do with your issue but just the same.

I have tried to change it in the app and in the car to the max but none of them stick

In the car? Do you have location based charging settings set? Did you change to unlimited or 48A before plugging in?