When installing an EV charging point, it’s important to understand how much charge a user can draw in a given time period.
For example, when installing chargepoints at a shopping centre, a faster rate of charge is more important then when installing a home chargepoint to be used over night.
In this article, we’ve set out the factors that affect charging speed and how to calculate charging times.
There are three factors that affect charging speed.
The first calculation to make is how long it will take to recharge an empty battery.
This is known simply as the empty-to-full charging time.
In normal use, EV drivers will never have a completely empty battery. We can take the formula above one step further by working out how long it will take to charge a partially empty battery.
Don’t worry if this formula seems confusing.
To help make things easy for you, we’ve created an interactive calculator below. Feel free to bookmark this page and return to use the calculator whenever you need.
When charging at a destination, many EV drivers are looking to “top-up” their battery instead of receive a full charge. This will give them confidence that they will always have the range they need. Because of this, most locations such as supermarkets and leisure parks use fast chargers which are ideal for this application.
We’ve set out the calculation for additional miles of range below. It’s slightly more complicated as it requires you know the efficiency of the vehicle.
As a guide, the most efficient EVs currently available are around 240 Wh/mile. The least efficient use around 420 Wh/mile.
As before, we’ve created an easy to use calculator below.
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