Vendors are tweaking their Battery Management Systems all the time but I'm not
aware of any vendors that publish a curve for their vehicles. Generically the
claimed charge rates are only achieveable when the battery charge level is
below ~50% and the battery temperature is above ~12c.
Various interest groups/online magazines are the sources for most of the
available curve data eg:
https://conormclaughlin.net/img/ev_charge_curves/ev_charge_curves.png
https://cdn.motor1.com/images/custom/img-tesla-model-3-sr-mic-lfp-2021-dcfc-power-comparison-20210618.png
generic curves associated with particular battery technology ought to be
possible - otherwise an assumption of an average charge rate at 50% of that
claimed will get you into the right ball park!
cheers
div
On Thursday, 16 May 2024 at 08:38, Jakob Erdmann via sumo-user
<[email protected]> wrote:
> @Div, from a technical point of view, it wouldn't be to hard to let the user
> define a charging-rate-curve parameter for the vehicle. Are you aware of
> available data on such curves?
>
> Am Di., 14. Mai 2024 um 12:32 Uhr schrieb The div via sumo-user
> <[email protected]>:
>
>> You can get the chargingBegin/End and totalEnergyCharged values for each
>> vehicle from chargingstations-output.
>>
>> In your calculation the charging station has an efficiency factor that
>> reduces the effective power - you need to apply that.
>>
>> Yes your calculation will give you a time, however that will be shorter than
>> real world times for any effective power over ~7kW
>>
>> If you want to look at real world times you have to consider the charging
>> rate supported by the vehicle and the charge curve of the vehicle. The
>> latter varies non-linearly depending on the battery level, with higher
>> charge rates being supported at lower levels of charge. It's non-linear
>> because most vehicle BMS step change the charge levels during charging. Sumo
>> doesn't attempt to model this at the moment.
>>
>> You could do something with traci and override charge levels but this would
>> negate the utility of the charging station output files.
>>
>> Temperature also has a significant impact on charging rate and ev battery
>> usage - summer/winter variations of 30% are not uncommon - that could mostly
>> be handled with different parameters for ev/chargestation in separate runs
>> for each 'temperature' (some subtleties of battery temperature/conditioning
>> vs external temperature would be missed)
>>
>> Basically I don't think modelling real world charging is feasible with SUMO
>> at the moment* - I'd just qualify any results by saying you're
>> underestimating ev charge times.
>>
>> *if chargingstations supported/honoured a 'chargeRate' for each vehicle then
>> with traci get/set methods for this it would be feasible to better model
>> actual behaviour of charge stations.
>>
>> Cheers
>> Div
>>
>> -------- Original Message --------
>> On 14 May 2024, 10:51, TIPPANA RAJESH via sumo-user < [email protected]>
>> wrote:
>>
>>> How to get the charging time(t in secs) required by a ev vehicle at a
>>> particular charging station to get it fully charged?
>>>
>>> Suppose,
>>> maxBatteryCapacity = M Wh
>>> actualBatteryCapacity = x Wh
>>> Power of charging station = P Watt
>>>
>>> t = (M-x)/P * 3600 secs. Will this work.
>>>
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