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Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Feb 22, 2019 3:40 am
by Oilpan4
Are there currently any cars being sold that can L2 charge faster than 7 or 8kw?

I see 11 and 15kw j1772 evse units but I am not aware of any cars that charge much faster than 8kw.

I tried searching for 11 and 15kw charging and this is the only thing that came up.

Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Feb 22, 2019 5:40 am
by SageBrush
^^ common in Europe up to 22 kW. In the US I am only aware of Tesla, up to 19.2 kW

Both of the above cases are 80 Amps but Europe has a more common non-commercial distributed 400v infrastructure that supplies ~ 273V to the outlet while the US L2 voltage is 240V

Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Feb 22, 2019 6:42 am
by Randy
The Tesla Model 3 with the Long Range battery can be charged at 48 amps, so that works out to be a little above 11 kW at 240 volts.

Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Feb 22, 2019 8:02 am
by SageBrush
Randy wrote:The Tesla Model 3 with the Long Range battery can be charged at 48 amps, so that works out to be a little above 11 kW at 240 volts.
In the US, yes. I'll guess that in Europe the car reaches 48*0.273 = 13.1 kW

Addendum: or maybe not. There are subtleties related to 3-phase charging that I do not understand.

Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Feb 22, 2019 8:35 am
by Oilpan4
I was thinking if anyone had one it would be tesla.
Everyone is still playing catch up to them.
(Except for some of the evse manufacturers)

I have the 4 gauge welder circuit in the garage that could easily power a 15kw evse.

Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Feb 22, 2019 8:49 am
by SageBrush
Oilpan4 wrote:I was thinking if anyone had one it would be tesla.
Everyone is still playing catch up to them.
(Except for some of the evse manufacturers)

I have the 4 gauge welder circuit in the garage that could easily power a 15kw evse.
Depending on the model, Tesla ranges from 32 to 80 Amps. My LR Model 3 takes up to 48 Amps. I've yet to take advantage of the maximum but I like knowing that it is available. It makes going off the Supercharger path on long trips something to barely think about.

I don't see the advantage of charging over ~ 8 kW at home since I can always stop at a Supercharger on my way out of town if I leave home with a partially depleted battery. My home routine is to charge when the battery drops to ~ 100 miles range, and then I charge up to 250 miles.

Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Mar 08, 2019 2:54 pm
by GlennD
SageBrush wrote:
Oilpan4 wrote:I was thinking if anyone had one it would be tesla.
Everyone is still playing catch up to them.
(Except for some of the evse manufacturers)

I have the 4 gauge welder circuit in the garage that could easily power a 15kw evse.
Depending on the model, Tesla ranges from 32 to 80 Amps. My LR Model 3 takes up to 48 Amps. I've yet to take advantage of the maximum but I like knowing that it is available. It makes going off the Supercharger path on long trips something to barely think about.

I don't see the advantage of charging over ~ 8 kW at home since I can always stop at a Supercharger on my way out of town if I leave home with a partially depleted battery. My home routine is to charge when the battery drops to ~ 100 miles range, and then I charge up to 250 miles.
Do not forget that the car sets the maximum current. Your 3 tells the EVSE it can use up to 40A. The EVSE tells the car what it can supply and the car respects that. Ie if the supplied EVSE says 24A then the car:s charger charges at 24A, Going ovr=-er the car's max is a wasdte of money.

I just changed cars and my 40A evse charges my new car at 28,5A. Today I would make s 30A EVSE but the 40 works fine per the J1772 protocol. I just waste 10A.

Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Mar 08, 2019 3:50 pm
by SageBrush
GlennD wrote:
SageBrush wrote:
Oilpan4 wrote:I was thinking if anyone had one it would be tesla.
Everyone is still playing catch up to them.
(Except for some of the evse manufacturers)

I have the 4 gauge welder circuit in the garage that could easily power a 15kw evse.
Depending on the model, Tesla ranges from 32 to 80 Amps. My LR Model 3 takes up to 48 Amps. I've yet to take advantage of the maximum but I like knowing that it is available. It makes going off the Supercharger path on long trips something to barely think about.

I don't see the advantage of charging over ~ 8 kW at home since I can always stop at a Supercharger on my way out of town if I leave home with a partially depleted battery. My home routine is to charge when the battery drops to ~ 100 miles range, and then I charge up to 250 miles.
Do not forget that the car sets the maximum current. Your 3 tells the EVSE it can use up to 40A. The EVSE tells the car what it can supply and the car respects that. Ie if the supplied EVSE says 24A then the car:s charger charges at 24A, Going ovr=-er the car's max is a wasdte of money.

I just changed cars and my 40A evse charges my new car at 28,5A. Today I would make s 30A EVSE but the 40 works fine per the J1772 protocol. I just waste 10A.
I think you are saying that the charge rate is the lesser of of the maximum that the car can take or the EVSE can supply. That is correct.
My case is the reverse of yours: my home EVSE maxes out at 32 Amp while the car is able to take up to 48 Amps so I end up with a 32 Amp charge rate. That is fine for home; on the road I appreciate knowing that that my car can take advantage of 48 Amp Tesla destination EVSEs.

Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Mar 08, 2019 4:13 pm
by GlennD
Your car to fully charge needs 48A. The EVSE tells the car how much current is available vis the pilot. In your case the EVSE tells the car 32A is available and the car sets itself to 32A.

This is all per the North American Standard. I do not know anything about Europe.

Re: E-MotorWerks JuiceBox - an open source 15kW EVSE

Posted: Fri Mar 08, 2019 4:16 pm
by LeftieBiker
Your car to fully charge needs 48A.
Eh? Why would charging at a lower amperage (but still much higher than the minimum required by J-1772) result in an incomplete charge?