Portable chargers for electric vehicles (EVs) are a convenient solution for charging your car anytime, anywhere. However, incorrect use can damage your vehicle or even pose safety hazards. Follow these tips to ensure safe and effective use of your portable charger.
1. Choosing the Right Plug and Socket
- Current Limits: The 32A/16A/10A ratings indicate the maximum safe current the charger can handle. Exceeding these limits can cause overheating and damage.
- Common Plugs: Most portable chargers use 16A/15A three-prong plugs, suitable for 16A or 15A sockets (often used for air conditioners, dryers, or water heaters). In North America, this usually means NEMA 5-15 sockets. Higher current sockets like NEMA 14-50 or NEMA 6-50 are also used due to the 110V voltage.
- 32A Chargers: These require specialized 32A sockets, like the European CEE sockets.
- 10A Sockets: If only a 10A socket is available, you can use an adapter for a 16A/15A plug, but ensure the charging current does not exceed 10A. Some low-power chargers use a 10A small three-prong plug, which fits common 10A sockets.
2. Using Extension Cords or Power Strips
If the vehicle is far from the socket, you can use an extension cord or power strip, but be mindful of the current limits to avoid overheating.
3. Setting the Current
Set the current based on the capacity of your wiring and socket to prevent overheating or fire. If unsure, start with a lower setting and check for any overheating after an hour before increasing the current.
4. Estimating Charging Power and Time
Use the formula: Power (P) = Voltage (U) × Current (I). This helps calculate the charging power based on different currents. Charging power indicates how many kilowatt-hours are charged per hour, allowing you to estimate the charging time based on your vehicle’s battery capacity.
5. Scheduled Charging
Use the scheduling feature of your charger to start charging during off-peak hours at night to save on electricity costs. Note that this feature requires your vehicle to support scheduled charging, which might only be available with the original portable charger.
6. Proper Cable Placement
Since portable chargers handle high currents and generate significant heat, do not tightly coil the cables. Spread them out loosely or hang them to ensure proper ventilation and cooling.
7. Temporary Grounding Solutions
Portable chargers need a three-prong socket with one prong connected to the ground to prevent accidents from electrical leakage. In older buildings or remote areas without grounding wires, the charger may not start. Temporary solutions include using rebar in foundations, iron water pipes, or grounding rods driven 1-2 meters into the ground. Ensure the connection is secure. Avoid using grounding plugs or adapters sold online, as they pose significant risks.
8. Correct Steps for Using a Portable Charger
Portable chargers handle high currents, so there is a risk of electric shock when plugging or unplugging. Always disconnect the charging gun from the vehicle first before unplugging from the socket. To stop charging, press and hold the slow charge gun’s switch until you hear a click indicating the relay has disengaged, then unplug the gun.
