billybonfire3
Established Member
Hi Am I right in thinking that, due to the car, any type 2 charger I use, even a 22kw one, will only deliver 7kw as the the fastest AC the car will convert. To get faster it would have to be a teathered CCS?
Yep - it's all to do with the car supporting single phase AC (1 x 7kW) rather than three phase 22kW AC (3 x 7kW). As mentioned above, even 11kW will only give 3.5kW (3 x 3.5kW => 11kW).Hi Am I right in thinking that, due to the car, any type 2 charger I use, even a 22kw one, will only deliver 7kw as the the fastest AC the car will convert. To get faster it would have to be a tethered CCS?
The same applies if you have the onboard 11kw charger if you use a single phase cableYep - it's all to do with the car supporting single phase AC (1 x 7kW) rather than three phase 22kW AC (3 x 7kW). As mentioned above, even 11kW will only give 3.5kW (3 x 3.5kW => 11kW).
You might see some of the cars sold in Europe supporting 11kW but apparently three phase supply to the home is more common there than in UK, so UK models have single 7kW rather than three phase 11kW
Actually, it may only be 1/3 - single phase from 3 phase? If right - that would mean 3.66kW from an 11kW 3 phase source and 7.66kW from a 22kW 3 phase source. I have read though that the maximum power accepted by the ZS type 2 socket is 6.6kW. (Not sure about that.)An 11kw charger will only charge the MG at 3.5kw, as it's 1/2 the current!
Please remember this is many UK as European mg have 11kw on board chargerThis info from EV Database can help.This is for LR but same applies for SR as well.Check the last entry in the table and the note below it:
View attachment 7173
Yup - as I thought.This info from EV Database can help.This is for LR but same applies for SR as well.Check the last entry in the table and the note below it:
View attachment 7173
No - if your car is capable of charging on 3 phase at 11 kW and you connect it to single phase 7kW you will get 7kW. If, on the other hand your car can only accept single phase and you connect it to 11kW three phase, it will only be able to use one of these phases so will only charge at 1/3 of 11kW.So a if you have a 11kw car charging at a home point in the UK on a 7kw charger you will only 3.7kw? As it will only use 1 of the 3 phases
No - if your car is capable of charging on 3 phase at 11 kW and you connect it to single phase 7kW you will get 7kW. If, on the other hand your car can only accept single phase and you connect it to 11kW three phase, it will only be able to use one of these phases so will only charge at 1/3 of 11kW.
An "11kW" car is simply one enabled to accept 3 phase 11kW input. One which is not enabled - can only accept single phase - if at 7kW, then 7kW - but if offered 11kW - but 3 phase, can only see one of these three phases, so 1/3rd of 11kW. Each of the three phases is at 120 degrees to the others. Hope that makes sense.So a 11kw car is not 3 x 3.7kw more like 3.7/7/3.7kw?
That's possible. But I think it's more likely that there are three identical 3.5 kW chargers. Since 3.5 kW is so low and 7 kW is tolerable, they do some tricky switching on one of the chargers, say the B phase one, so it can operate on its own phase (B), or if there's no voltage there, switch to parallel with phase A. Of course, all considering the maximum current that the EVSE declares via the pilot signal.When I had the BMW i3 it charged at 7kW on my home charger on a single phase. At the office it charged at 11kW. My assumption here was it had 3 AC inputs into the converter: 1 capable of 7kW and 2 capable of 3.5kW. When charging on a single phase it used the maximum 7kW capability available on a single phase. When charging on a 3-phase charger it limited all 3-phases to 16Amp (3.5kW), giving a maximum of 11kW.
I was thinking only a 22kw on board charger would charge at 7kw on single phase? Every day's a
View attachment 7188That's possible. But I think it's more likely that there are three identical 3.5 kW chargers. Since 3.5 kW is so low and 7 kW is tolerable, they do some tricky switching on one of the chargers, say the B phase one, so it can operate on its own phase (B), or if there's no voltage there, switch to parallel with phase A. Of course, all considering the maximum current that the EVSE declares via the pilot signal.
I don't know why they don't do the same for the C phase charger, but probably that relay is a bit expensive and tricky to get safe, foolproof, and reliable (high current relay contacts tend to pit and wear out). Also, more than 32 A per phase is uncommon, except perhaps in the USA, where it's nearly all single phase anyway.
I was thinking only a 22kw on board charger would charge at 7kw on single phase? Every day's a school day ?
Wrong. It’s 1/3 not 1/2 ……..An 11kw charger will only charge the MG at 3.5kw, as it's 1/2 the current!