EV charging station sizer

For EPCs and station owners: give the AC/DC gun count and power, the simultaneity factor, the transformer and upstream short-circuit capacity, the daily vehicle throughput and the energy per vehicle — the engine returns the simultaneous demand, the transformer check, the daytime energy and cost at your own tariff, and the demand-charge shaving effect, all with charts.

① Charger configuration

Station typeDC power per gun (kW)DC gunsAC power per gun (kW)AC gunsSimultaneity factor (%)Power factor cosφ (blank = engine default, flagged)

② Station electrical parameters

LV line voltage (V)Transformer capacity (kVA)Upstream short-circuit capacity (MVA)

③ Energy, traffic and tariff (your own numbers)

Vehicles served per dayEnergy per vehicle (kWh)Energy tariff (per kWh — your input)Demand tariff (per kW·month — your input)Capacity tariff (per kVA·month — optional)Shaving target — peak demand (kW, blank = engine default, flagged)Shiftable load (kW — ordered charging / off-peak shifting)Storage power (kW, optional)Storage capacity (kWh, optional)Storage round-trip efficiency (%)

Fill the charger configuration, the station parameters and your tariff, then click Compute: the engine returns the simultaneous demand, the transformer/voltage/harmonic checks and the demand-charge shaving comparison — with five charts.