Information return by chargers

[andyd]

I noticed today when using a decent instavolt charger that although the percentage charge matched on the charger and the screen in the car but the range was 35 miles different.
Does anyone know how the charger works out the range?
Does it calculate it based on the car type or does it reqd from the car?

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[daveo4EV]

it guessed based on historical norms for EV’s - I severely doubt (but do not know for fact) any consumption information is shared with the chargers (i.e. the information required for the charger to know how many miles driving a kWh equals) - also the charger can only know what power it gives the vehicle - it can’t know for example how much actually lands in the battery which will also throw things off

for example when I’m sitting at a 32 amp charger with my bolt - the charger is providing 7.68 kW - but if I’m in the bolt and the heater is running - only about 4 kW of that 7,68 kW is landing in the battery - the other 3.68 kW is being siphoned off in charing overhead and running the vehicle’s heater…

also depends on the charging standard - J-1772 is different than CCS

 

[andyd]

Hi
Does yours report the correct percentage charged?
It must send something back to report the percentage as its changes in sync with the car's display. Mine used to be in sync with the instavolt charger but not now. Maybe next time someone uses one they can confirm is both values are in sync?
Thanks

it guessed based on historical norms for EV’s - I severely doubt (but do not know for fact) any consumption information is shared with the chargers (i.e. the information required for the charger to know how many miles driving a kWh equals) - also the charger can only know what power it gives the vehicle - it can’t know for example how much actually lands in the battery which will also throw things off

for example when I’m sitting at a 32 amp charger with my bolt - the charger is providing 7.68 kW - but if I’m in the bolt and the heater is running - only about 4 kW of that 7,68 kW is landing in the battery - the other 3.68 kW is being siphoned off in charing overhead and running the vehicle’s heater…

also depends on the charging standard - J-1772 is different than CCS

 

[daveo4EV]

in north america I know 2 things…

1. the J-1772 charging protocol (level 2 AC) has very little “data from the vehicle” - but with a PMCC porsche is clearly sending data because the PMCC knows if the car is ‘done charging’ and/or it’s ”delay’d charging (flashing blue) - both of these pieces of information are outside the strict J-1772 specficiation
2. when fast charger via CCS - the car clearly reports battery SOC % to the charge and I’ve always found it to be in-sync with the in car displays and externally on the CCS charger’s display.

I have no specific expereince/knowledge about any standards/specifications for non-North American’s charging protocols.

 

[NC_Taycan]

in north america I know 2 things…

1. the J-1772 charging protocol (level 2 AC) has very little “data from the vehicle” - but with a PMCC porsche is clearly sending data because the PMCC knows if the car is ‘done charging’ and/or it’s ”delay’d charging (flashing blue) - both of these pieces of information are outside the strict J-1772 specficiation
2. when fast charger via CCS - the car clearly reports battery SOC % to the charge and I’ve always found it to be in-sync with the in car displays and externally on the CCS charger’s display.

I have no specific expereince/knowledge about any standards/specifications for non-North American’s charging protocols.

I learned just recently, compliments of other members here, that if the vehicle and charger both speak ISO15118, there can be an exchange of information. This may indeed be possible over J1772 if the hardware at both ends is designed for it (meaning ISO15118 over J1772 is indeed "outside the original J1772 spec.") For DC chargers and chargers using the CCS plug, I believe ISO15118 is a/the standard.

 

[wmras]

I learned just recently, compliments of other members here, that if the vehicle and charger both speak ISO15118, there can be an exchange of information. This may indeed be possible over J1772 if the hardware at both ends is designed for it (meaning ISO15118 over J1772 is indeed "outside the original J1772 spec.") For DC chargers and chargers using the CCS plug, I believe ISO15118 is a/the standard.

Nice!
Highly probable - there is no circuitry in chargers that would block the signal riding on the charging voltage. The car would need the proper modem to receive and reply.

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