Refrigerator

An inverter takes usually-low-voltage DC and makes AC out of it. As this technique is applicable to any mains-operated appliance the question is a non-starter.

Yes. Inverter can be used for refrigerators.

DHAYANANDHAN.S

I believe your asking about the usage of VFDs currently available for air conditioning packaged systems vs refrigerators. I'm probably wrong.

With air conditioning systems, you control the evaporator temperature, so it does not go below freezing, and continues condensing water vapor from the air, as well chilling the air. Where a VFD is used, the compressor is slowed down to prevent evaporator freeze up, and continue cooling the room.

For a refrigerator, you want to cool the interior as fast as possible, so using a variable speed drive would not make sense. This is a bang-bang control system. i.e. it's on or off, no variable control other then set point of the off temperature state.

If I'm wrong about your question, you can use an inverter to convert DC battery to AC to operate a refrigerator, but you probably would not use it for air conditioning, as you would only use the stored battery power for emergency power usage, like food storage.

ignator

i suppose that since compressors are used in ac's and refrigerators which need high voltage for the start and inverters cannot provide so much power for inititation. but still ac's can work on inverters yet refrigerators cannot and if we want both then refrigerator must be operated before ac.

why so?

Nonsense.

Typical hermetic "canned" refrigerator motors might not be rated for inverter duty, which basically requires upgraded winding insulation.