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Re: [sumo-user] Calculating charging time of a ev vehicle at a charging station
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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:
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 <sumo-user@xxxxxxxxxxx> 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?
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 < sumo-user@xxxxxxxxxxx> 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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