How do you calculate battery capacity for an electric vehicle?

Battery capacity is expressed in ampere-hours (Ah) and represents the total amount of energy stored in the battery pack that can be used to power a vehicle. To calculate battery capacity for an electric vehicle, you need to know the total energy stored in the battery pack (in kilowatt-hours, kWh) and divide it by the battery pack’s voltage.

How is battery capacity measured?

Battery capacity is measured in two different metrics: Gross or Total Capacity It is the total amount of energy theoretically held by the battery. Net or Usable Capacity This is the energy that a car can actually draw on to propel itself.

What is battery capacity?

Battery capacity or Energy capacity is the ability of a battery to deliver a certain amount of power over a while. It is measured in kilowatt-hours (product of voltage and ampere-hours). It determines the energy available to the motor and other elements.

What is the battery capacity of an electric vehicle?

Battery capacity = 50 kWh / 400 V = 125 Ah Note: The actual usable capacity of an electric vehicle battery can be less than the theoretical capacity due to factors such as battery degradation and system inefficiencies. Determine the total energy stored in the battery pack.

How do I estimate battery capacity using a multimeter?

To estimate battery capacity using a multimeter, follow these steps: Measure the OCV using the multimeter’s voltage setting. Compare the measured voltage with the manufacturer’s voltage vs. state of charge (SOC) chart. Estimate the battery capacity by multiplying the rated capacity by the SOC percentage obtained from the chart.

How do you measure a battery's OCV?

Allow the battery to rest: Before measuring the OCV, let the battery rest for a specified period (typically 1-2 hours) to minimize the effects of voltage fluctuations due to load changes. Measure the open-circuit voltage: Use a digital multimeter or another accurate voltage measurement device to measure the battery’s OCV.