How to calculate battery capacity for ev. The assumptions are as follows. Capacity an electric vehicles battery capacity is measured in kilowatt hours kwh the same unit your home electric meter records to determine your monthly electric bill. E v q.
This calculator covers the basics which probably applies to 90 of the needs. Volumetric energy density u v whm 3 uv fracebcvccpc tag4 gravimetric energy density u g whkg ug fracebcmbc tag5 where. Sizing the battery pack.
Hence the final version of the battery capacity formula looks like this. In the ev world. E is the energy stored in a battery expressed in watt hours.
Lets say were charging a 75 kwh ev from a 22 kw wall box. To measure the capacity of lithium batteries we highly recommend you use watt hour wh. Hopefully you remember that amp hours are a measure of electric charge q the battery capacity.
You divide the capacity with the power and you will get the runtime very simple. The benefit is that you could calculate the runtime easily and accurately without considering the voltage at all. Sizing the battery pack is made far more complicated than needed there arent that many different options.
M bc kg battery cell mass. V is the voltage of the battery. The following graph shows how range miles varies with battery capacity kwh for seven values of mileskwh.
Range can be calculated as range miles battery capacity kwhmileskwh.
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