Can a 12v inverter be run permanently by a car alternator?

Yes, a 12V inverter can be run permanently by a car alternator, provided the alternator can supply sufficient power for the inverter's load. However, it's essential to ensure that the vehicle's electrical system can handle the added load without affecting the battery or other components. Continuous operation may also lead to overheating or wear on the alternator, so proper ventilation and monitoring are recommended. Additionally, using a deep-cycle battery for backup can help manage power demands more effectively.