Understanding Estimated Finish Time: How We Calculate It

DC chargers rated at 30kW or higher can display an estimated session completion time. This is especially helpful for fleet operations with strict schedules, letting you quickly see which vehicles will be ready to go. The estimated finish time updates in real time as charging speeds fluctuate giving you a reliable, continuously adjusted forecast.

Power vs Energy: What’s the Difference?

• kW (kilowatts) = speed of charging (think of it like water flowing through a hose)
• kWh (kilowatt-hours) = total energy added (like the total water in the bucket)
• Estimated Finish Time = How long it’ll take to fill your “battery bucket” from where it is now to full, using your current flow rate (kW)

In order to calculate estimated finish time, we look at how much energy your vehicle has gained so far and how fast it's charging. 

In the example above we can see that:

• The battery started at 3% and is now at 21% that's an 18% increase. 
• The charger has added 10.99 kWh in that time. 
• That means each 1% added takes about 0.61 kWh.

To reach the goal of 100%, the vehicle still needs 79% more charge. 

So we estimate: 

79% x 0.61 kWh = 48.27 kWh left to charge

Step 2: Divide by charging speed

At your current charging speed of about 30kW, it should take:

48.27 ÷ 30 = 1.6 hours (about 1 hour 36 mins)

We add that to your start time to show the Estimated Finish Time.

Final Estimated Completion Time:

• Start Time = 11:44 AM PST (2:44 PM EST)
• Duration so far = ~ 9 minutes 
• Remaining time = ~ 1 hr 36 minutes 
• Estimated Finish = ~ 4:29 PM EST

Important Note: Finish time updates automatically if charging conditions change (e.g., temperature, power drops, vehicle behavior).

Estimated finish times are based on the charger's local time zone, so times may vary slightly depending on your location and setup.