Free tool
How long will it take to charge?
Enter your charger, your battery and how far you want to top it up. You get
the hours, the range you gain per hour, and what a normal night on the driveway adds.
A charger delivers roughly ten
percent less than it draws, and that loss is already in the result.
to go from 20 to 80 percent
The calculation. Charger power is amps times volts. The energy
you need is the battery size times the part you are filling. Divide the one by the other, add
about ten percent for losses, and you have the hours.
Why the last twenty percent is slower. Above roughly eighty
percent the car itself tapers the current to protect the battery, so the final stretch takes
longer than this straight line suggests. That is also why most people set the limit at eighty.
Cold changes everything. In freezing weather part of the power goes
into warming the battery instead of filling it, and charging can take noticeably longer.
First question: does the charger even fit?
Before the hours matter, the service has to carry the charger at all. Open the EV charger load check →