3 phase 16A charger to MG4

[shpub]

One less theory to worry about then! Scrub that. The only thing I can think of is a fault with the charger unit in some way as it definitely not displaying what I would expect an AC charging session to be. It looks like you have been charged at the DC rate it was showing.

 

[shpub]

BTW, 6.0 kW from 400 V and 15 A looks as though the coder for the Genie charger didn't understand three-phase power at all. The current will get split with a delta load, and the voltage gets split if it was a Y/star load. That's why 3-phase power is always V * I * √3, never V * I (where V here is the line-to-line voltage, standard for 3-phase calculations).

That is true for calculating the overall 3 phase load but 3 phase in the EVSE is handled as 3 separate single phase supplies going into a 3 single phase chargers that then combine their outputs in a single supply. There is nothing to state that the supply must be equally shared. It may not be a true three phase design as the individual phase pins could be supplied by a very high current single phase supply. So they measure the voltage and current do a simple calculation and combine to give a total. In this case, the additional phases are simply used as parallel connections to support more current.

The Tesla Model S Gen 2 10kw 3 phase charger does not specify a true 3 phase supply. This is what the individual phases require. It is also the same unit that went into the V2 superchargers. It also has 3 separate Elcon charge units. Anyway your charger wiring experience may vary.

 

[Coulomb]

That is true for calculating the overall 3 phase load but 3 phase in the EVSE is handled as 3 separate single phase supplies going into a 3 single phase chargers that then combine their outputs in a single supply.

Sure. So the on-board chargers are usually wired in star. That means that the line-to-line voltage is split, and each charger gets 1/(sqrt 3) of the voltage (230V instead of 400V).

My point is that line-to-line voltage times line current is never correct for power delivered. I suppose unless there is a single load from one phase to another, but that never happens in a vehicle. So their calculation is never valid for a vehicle.

 

[shpub]

Sure. So the on-board chargers are usually wired in star. That means that the line-to-line voltage is split, and each charger gets 1/(sqrt 3) of the voltage (230V instead of 400V).

My point is that line-to-line voltage times line current is never correct for power delivered. I suppose unless there is a single load from one phase to another, but that never happens in a vehicle. So their calculation is never valid for a vehicle.

Absolutely right as at that point, the maths take into account the phasing etc.
We don't know if the readings are for DC or AC. AC and you are correct. DC and the on screen calcs are correct. Either way it is not right as it doesn't agree with the car or the bill!

Faulty EVSE is most likely the real problem.

 

[fnegroni]

I did a quick test this morning and the EVSE at work (a bp pulse 7) seems to be supplying at 7 kW: showed 0.7kWh supplied in 6 minutes on its display

We also have some bp pulse pro charger smart EVSEs but they don’t have a display and I wouldn’t know how much it supplied until I got billed a month later ??‍

 

[BingBong]

My V1 Luxury charging at 9.5kw with 16a*3 charger

 

[shpub]

Looking more and more like a charger billing fault of some kind.