The answer depends on the type of vehicle you have.
For internal combustion engine (ICE) cars, you generally cannot run the AC solely on the battery for an extended period. The AC compressor is powered by the engine. While the battery provides the initial power to start the car, the engine must be running to keep the AC compressor working. The alternator, driven by the engine, recharges the battery while the engine is running and powers the AC. Attempting to run the AC with just the battery will quickly drain it.
For electric vehicles (EVs), the AC system is powered by the high-voltage battery pack. You can run the AC when the car is "on" but not actively driving. However, doing so will drain the battery, reducing your driving range.
Here's a breakdown:
ICE Cars:
- No, the AC compressor is belt-driven by the engine.
- The battery provides the initial start-up power.
- The engine must be running to power the AC compressor and recharge the battery via the alternator.
Electric Vehicles:
- Yes, the AC is powered by the battery.
- Running the AC will drain the battery and reduce driving range.
- It's possible to use the AC while parked, but it significantly depletes the battery.
In summary: While you technically can use AC with the "battery" in an electric car, it will drain the battery and reduce your driving range. In an ICE car, the AC only functions when the engine is running, which simultaneously charges the battery.
