How Long Does It Take to Charge an EV in Nigeria?
Calculate EV charging time using battery energy, charger power and your daily schedule, with worked examples and questions to ask before ordering.
Tochukwu Nkwocha
Founder
To estimate charging time, first decide how much energy you need to put back into the battery. Divide that energy by the charging power actually sustained, then allow for charging losses, changes in charging speed and interruptions. This is more useful than asking how long every EV takes to charge from empty.
Each Sure Imports EV includes a compatible wall-mountable charger for standard Nigerian mains electricity. The examples below explain planning; the power ratings are illustrative and are not specifications for the charger supplied with a particular model.
Understand the three numbers
- kWh: an amount of energy. Battery capacity and electricity purchased are commonly expressed in kWh.
- kW: power, or the rate at which energy is transferred.
- State of charge: the battery percentage shown by the vehicle. A move from 30% to 80% is a rise of 50 percentage points.
For a simplified calculation using a 60 kWh usable battery, adding 50 percentage points represents 30 kWh. Use usable capacity when available; do not silently substitute a larger advertised gross battery figure. Battery displays and charging behaviour also mean a real session will not always follow the simplified arithmetic exactly.
A worked charging-time example
Energy to add ÷ sustained power = ideal time. Adding 30 kWh at 7 kW gives 4.29 hours, about four hours and 17 minutes. At 3.5 kW it gives 8.57 hours. These figures assume the stated power is sustained into the battery throughout the session.
| Energy to add | Assumed battery-side power | Ideal time |
|---|---|---|
| 20 kWh | 3.5 kW | 5.7 hours |
| 20 kWh | 7 kW | 2.9 hours |
| 30 kWh | 7 kW | 4.3 hours |
| 45 kWh | 7 kW | 6.4 hours |
If instead 7 kW is measured at the electricity supply, an assumed 90% overall charging efficiency means about 6.3 kW reaches the battery. On that assumption, 30 kWh takes about 4.76 hours before any further slowdown or interruption. Ninety percent is an example assumption, not a guaranteed efficiency.
Why a charger’s headline rating is not the whole answer
The charger, vehicle and installation all affect the actual session. The Department of Energy’s charging-equipment guidance identifies battery state, capacity, the vehicle’s charging capability and the equipment as relevant factors. A charger capable of a higher output cannot make a vehicle accept more than its supported limit.
Ask for the supplied wall charger’s rating and the vehicle’s AC charging limit. If you are considering DC charging, request its separate specifications. Do not apply a DC fast-charging advertisement to an overnight wall-charger session.
Plan a daily top-up rather than a daily full charge
Suppose your route consumes an assumed 24 kWh during a working day. At a sustained 6 kW into the battery, replacing it takes four ideal hours. If the vehicle is parked from 8 pm to 6 am, that leaves a ten-hour parking window—but your plan must also account for the hours when electricity is actually available.
Write two schedules: a normal day and a difficult day. The difficult version should include a late return, an early departure or an interruption you realistically encounter. If it cannot recover enough charge, change the route, schedule or charging arrangement before depending on the vehicle for that operation.
Why the last part of a charge can take longer
Charging power can change during a session rather than remaining flat. The Department of Energy explains that fast charging commonly slows near the upper end of battery charge. Use model-specific information for your actual vehicle, particularly when a quoted time covers only a percentage interval such as 20% to 80%.
Follow the manufacturer’s daily charging recommendation. Do not assume a universal daily percentage target applies to every battery chemistry and model, or that the time for 20% to 80% can simply be doubled to predict a full session.
What to ask before you order
- What is the supplied wall charger’s rated power?
- What is the vehicle’s AC charging limit?
- Is the battery figure usable or gross capacity?
- What starting and finishing percentages does any advertised charging time cover?
- What installation conditions are assumed?
- What daily charging practice does the manual recommend?
After delivery, record several sessions under your normal conditions. Use those measured times to refine the timetable. Pair this guide with our Naira charging-cost guide and backup-power planning guide before deciding whether your charging window is sufficient.
