Yes. A powered EV charger can use a small amount of standby electricity for its controls, indicators and connected features. The exact amount depends on the equipment and whether a vehicle remains plugged in.
Why an Idle EV Charger Still Uses Power
An EV charger, or EVSE, monitors the electrical connection and controls when power can flow to the vehicle. Displays, status lights, timers and network connections can remain active between charging sessions.
32A J1772 model includes an LED display and delayed charging, while the 40A J1772 model is available with plug-and-play or Wi-Fi-enabled connectivity.
These features help explain why standby use varies between chargers, but they do not reveal the exact wattage. That requires model-specific data or suitable measurement. The ENERGY STAR EV charger program provides another reference for comparing the efficiency of eligible equipment.
Charger Standby and Vehicle Energy Use Are Different
A powered charger with no vehicle attached uses electricity for its own electronics. When a vehicle remains connected, it may also request power.
Depending on the vehicle, this energy may support battery temperature control, cabin preconditioning, remote access or the low-voltage system. Scheduled charging can also keep the charger and vehicle communicating while they wait.
Electricity recorded while the vehicle is connected therefore should not automatically be counted as EV charger standby use.
How Much Does Standby Power Cost?
There is no single standby figure for every home EV charger. The most reliable number comes from a manufacturer specification or a suitable measurement of the individual circuit.
The calculation should use the charger’s average standby wattage, the hours it remains in that state and the local electricity rate. These values can then be converted into estimated annual electricity use and cost.
For illustration, a charger averaging 5 watts throughout the year would use about 43.8kWh. At a hypothetical electricity rate of $0.18 per kWh, that would cost approximately $7.88 annually.
This is a calculation example, not a measured figure specific model. Actual use can change when a display wakes, a network connection becomes active or a vehicle is attached.
App records also need to be interpreted correctly. The EVDANCE Flux Pro 40A NACS home charger supports app-based scheduling and energy tracking. These records can show the energy delivered during charging sessions, but they should not automatically be treated as a measurement of standby consumption.
A household electricity bill cannot normally isolate this small load from other home energy use. Measuring a 240V charging circuit requires properly rated monitoring equipment. A standard 120V plug-in energy meter should not be adapted for this purpose.
Should You Unplug a Portable EV Charger?
A portable EV charger does not always need to be unplugged after every session. The correct approach depends on its instructions, power source, environment and intended use.
A portable model may be stored for travel or used regularly at a suitable home outlet. A wall-mounted charger serves a different use case by providing a more permanent charging position.
In either setup, stop using the equipment if the plug or outlet becomes loose, discolored or unusually hot. Unplugging between sessions does not repair a damaged electrical connection.
How to Reduce Standby Use
Check whether the manufacturer publishes standby or no-vehicle power consumption. Do not estimate it from maximum charging output because the two ratings describe different operating conditions.
If supported, turning off an unnecessary display or network function may reduce background use. A charging schedule alone may not eliminate it because the controls remain active while waiting.
Do not use an ordinary household smart plug to control a 240V EV charger. Any monitoring or switching equipment on the charging circuit must be properly rated for that application.
Recommend Reading: Charging Records Make EV Costs Easier to Track
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Can You Leave a Portable EV Charger Outside?