The maximum power output for charging an electric car from a standard outlet, typically referred to as Level 1 charging, is limited by several factors. Here's an explanation of the points:

Standard Outlet Voltage: In most regions, standard household outlets supply electricity at a voltage of around 120 volts in North America or 230 volts in Europe and other parts of the world.

Current Limitation: Standard outlets are typically equipped with circuit breakers or fuses designed to handle current up to a certain limit without overheating or causing electrical hazards. In North America, standard outlets are usually rated for around 15 or 20 amps, while in Europe, they may be rated for 10 to 16 amps.

Power Calculation: The power output for charging an electric car is calculated using the formula: Power (in watts) = Voltage (in volts) × Current (in amps).

North America Example: A standard outlet voltage is around 120 volts in North America. If the outlet is rated for 15 amps, the maximum power output would be 120 volts × 15 amps = 1800 watts, or 1.8 kilowatts (kW).

Europe Example: In Europe, where the standard outlet voltage is around 230 volts and the outlet is rated for 10 amps, the maximum power output would be 230 volts × 10 amps = 2300 watts, or 2.3 kilowatts (kW).

Charging Time Consideration: The power output from a standard outlet is relatively low compared to dedicated EV charging stations or home charging stations. Charging an electric car from a standard outlet typically takes longer due to the lower power output.

Suitability for Emergency or Trickle Charging: Standard outlets are suitable for emergency charging or trickle charging, especially when no dedicated charging infrastructure is available. They can be used to recharge an electric car over several hours or overnight slowly.

Consideration for Battery Capacity: The charging time required also depends on the capacity of the electric car's battery. Larger batteries will require more time to charge fully from a standard outlet than smaller batteries.

Compatibility: Most electric cars come with a Level 1 charging cable plugged into a standard household outlet, making it convenient for owners to charge their vehicles at home or in emergencies.

Alternative Charging Options: Owners may consider installing a Level 2 charging station at home, which typically operates at higher power levels and can charge the vehicle more quickly than a standard outlet.

In summary, while standard outlets are convenient for charging electric cars, their power output is limited, resulting in longer charging times than dedicated charging stations.