Forum

Unisciti allacomunità

Charging from more than one plug simultaneously

Sorry if this has been asked/answered before.

Where I live (Norway) there are quite a lot of free charging for EV's. These consist of poles with two plugs each at 16A/230V (one such pole per two parking spaces).

With the Model S with twin charger (20kW), or even with just the single charger (10 kW) (there's only one cable and plug anyway), is there a way in which you could charge from both outlets at the same time, so that you can charge at 32A/230V (7.4 kW) thereby cutting chargin time in half? I guess what I'm thinking is like some kind of Y-connector between the outlets and the charging cable.

Yes, an electrician could easily make up such a 'Y' connector, but odds are the two outlets are on the same circuit, so it wouldn't help.

Plus the computer might not accept the charge because it would sense that some kind of extension cable was being used.

Thanks for the answer, but I can't really understand this "one circuit" thing. What definines one circuit? In these charging stations I can tell you atlease that the two outlets have separate safety breakers (or whatever it's called in english) - they are right below the actual outlets. So if two cars charge at once and one of them overloads the circuit that breaker will switch off, while the other outlet is unaffected. Would this mean they are on the same or different circuits?

From that description, it sounds like they're on separate circuits. However, on thinking about it, I don't see how a simple Y connector would work. You'd need to talk to an electrician, see if it's possible and how much it would cost, and then test it out on your car. I doubt that Tesla would provide such a solution.

I think I would much rather test it on someone else's car first :) But I will look into it. And report if I have any luck with it.

If they are in different circuit they would be in different phase as well, so simple "Y" cable would not work, if they are in same circuit then you don't win anything because you won't be able to draw any more than main breaker for that phase allows anyway.

If your main breaker allows 32A current then you should call an electrician to install cable and outlet to your garage for that amperage. Note that you will not be able to use anything else connected to that phase while recharging if you do that, because that would blew the breaker and then you wouldn't be charging anything.

Timo, he's talking about public electrical outlets, not in his home. Plus he's talking about 230v, so it would be a tricky deal.

230V is normal voltage in Europe. 230V@50Hz is what you get from ordinary wall socket.

I somehow missed the public electrical outlet part. Too much distraction I guess. I think using simple "Y" would work in that case for same phase, but I wouldn't risk it (because if they are in different phase you would get something else than 230V out of it).

Tesla will most likely say don't do it. I would do it only after researching the phases, etc., of the source AND analyzing the car's circuitry (probably not easy to uncover) to see if there would be any problem. Only then would I attempt such a connection. Bottom line: forget about it.

It's not worth the risk. It might work great as you use different chargers and then one day you could get one hell of a surprise. If you came across chargers on different phases or reverse phased it would blow up the Y. You could probably fuse the Y so that wouldn't happen. Still risky. Plus you can not guarantee the current draw will be perfectly equal and you will end up tripping one of the breakers over time which would then trip the other.
You could also damage the chargers even if they're on the same phases.

The way I think it is explained is the peak current points from the two chargers are not coming at the same time.... kinda like turning on a power plant to a grid, you have to sync the phase cycle first.